Features and Functions. Keysight M9506A
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M9506A 5-Slot AXIe Chassis
User Guide
5
Features and Functions
This chapter explains the monitoring, synchronization, triggering and signal routing options for the AXIe chassis.
ESM Shelf Management Functions 76
Selecting a Clock Bus Source 87
External Trigger Signal Conditioning 89
Connecting an Input to an Output in the Crosspoint
PCIe and LAN Switching (Data Transfer) 95
Maximizing Data Upload Speeds 95
Electronic Keying (E-Keying) 97
Chassis Inhibit and Voltage Monitoring 100
Using the M9506A AXIe Zone 3 Area 101
Removing the Zone 3 Filler Panels 101
73
Features and Functions Chassis Block Diagram
Chassis Block Diagram
below is a simplified diagram showing how signals are routed between the Embedded System Module (ESM) front panel, and chassis backplane slots.
Figure 21 Simplified M9506A ESM Block Diagram
A block diagram of a complete M9506A 5-slot AXIe chassis system with a host
PC is presented on the next page.
74 Keysight M9506A 5-Slot AXIe Chassis User Guide
Chassis Block Diagram Features and Functions
Keysight M9506A 5-Slot AXIe Chassis User Guide 75
Features and Functions A Note on M9506A Drivers
A Note on M9506A Drivers
A total of six (6) drivers and Soft Front Panels (SFPs) are provided for the M9506A chassis with ESM. The SFPs are as follows:
– Two IVI Monitor Drivers (IVI-C and IVI .NET KtMAXIeMon ) for monitoring the chassis temperature sensors, setting fan speed, and utility functions.
– Two IVI Trigger Drivers (IVI-C and IVI .NET KtMAXIeTrig ).
– Two Soft Front Panel (SFP) Drivers ( AXIe Chassis Monitor SFP and AXIe Chassis
Trigger SFP )
Make certain that you have the latest drivers installed on your host controller prior to programming the chassis and ESM.
The most up-to-date installer is available on the M9506A web page: www.keysight.com/find/M9506A .
ESM Shelf Management Functions
On the M9506A, the ESM provides the following Shelf Manager functions:
– Monitor and control chassis fan speed
– Monitor chassis backplane temperature
– Monitor module health, as provided by the module vendor (may include voltages and temperatures, fuse status, alarms and alarm setpoints)
– Automatically and safely shutdown power upon a fan tray or power supply unit (PSU) failure
76 Keysight M9506A 5-Slot AXIe Chassis User Guide
Configure Fan Control Features and Functions
Configure Fan Control
The minimum chassis fan speed is approximately 600 RPM; the maximum fan speed is approximately 6000 RPM. Using a range of 10 to 100 (percentage of maximum), you can manually set the minimum speed you want the fans to operate at — 10 means the fan speed of approximately 2200 RPM and 100 is the maximum fan speed of approximately 6000 RPM.
Do not attempt to set the fan speed below 10 %.
Regardless of where you set the minimum fan speed, if the temperature inside the AXIe chassis rises, the fans speed increases to provide additional cooling. The resolution of the Current Fan
Level, as shown on the Chassis Health interface page, is an approximation of the fan speed.
The Fan Control page has the following five fields:
Fan Status
The shelf manager continuously monitors chassis fan speed, looking for indication that one or more fans are not turning. Normal fan status represents a fan speed of approximately 2200 RPM (or higher when required by instrumentation load). Below that speed, the shelf manager reports an alarm condition for that fan, it attempts to increase fan speed and continues to monitor. Failure of one fan will not result in interruption of power to installed modules.
Cooling Status
The shelf manager continuously monitors reported module temperatures, looking for indication that one or more modules is outside its optimal temperature range. This range is specified by the module, as are the thresholds for alarm conditions. Typically only high temperatures generate an alarm, although it is possible to specify low temperature alarm levels as well.
In the event of a high temperature alarm from any module, the shelf manager responds by increasing chassis fan speed and continuing to monitor. If the Upper
Non-Recoverable threshold is reached, the shelf manager requests the module to power down to its inactive state. Because this level is set by the module, it may not indicate that the module has failed, only that continued operation is inadvisable until the module cools.
Refer to the Chassis Health page for detailed information about individual modules, temperature alarms, etc.
Keysight M9506A 5-Slot AXIe Chassis User Guide 77
78
Features and Functions Configure Fan Control
Current Speed Level
This is the level the fans are currently operating and is controlled by the Shelf Manager. It increases from a set minimum as needed to adjust for changes in chassis temperature. The range is from 10 to 100, where 10 is the slowest speed level and 100 is the highest speed level. The Current Speed
Level indicates an approximate percentage of maximum fan RPM. Therefore, a level of 40 indicates the fans are operating at approximately 40% of maximum
RPM, and 100 indicates the fans are operating at 100% of maximum RPM. Note, the default/reset value is 10.
Dynamic Minimum Fan Level
This is the minimum fan level the shelf manager algorithm sets as it actively monitors the overall system temperature and temperature threshold events received from instrument modules. Over time, the algorithm adjusts this level towards the user-specified minimum fan level provided the cooling status remains at Normal.
Adjust Current Speed Level and Dynamic Minimum Fan Level
This user adjustable parameter sets both values. This level is kept in non-volatile RAM until you change it; cycling power to the chassis does not change the minimum fan level. Adjust the minimum fan level by entering a value in the field, or clicking the up/down arrows, and then clicking the Apply button.
Note that you can individually set the Current Speed Level and the Dynamic
Minimum Fan Level programmatically. The Web UI and the Soft Front Panel binds these two together. Setting the Current Speed Level is always temporary because the Dynamic Minimum Fan Level algorithm continuously adjusts the fan speed towards a dynamic minimum when cooling conditions permit. For example, consider a situation where the chassis and installed modules require a fan speed of 50 to maintain proper cooling. If you attempt to manually set the
Current Fan Speed to a lower value (40 for example) the algorithm overrides the setting and maintains the fan speed to provide adequate cooling. Conversely, if you manually set the fan speed to a higher value (65 for example), the algorithm sets that fan speed and does not change it unless additional cooling becomes required.
Of course, since the actual cooling requirements for the chassis and modules may continuously change, that actual fan Current Speed Level and the Dynamic
Minimum Fan Speed also change over time.
Example of Chassis Fan Speed
The following graph illustrates how the chassis fan speed operates. For simplicity, only one temperature event is shown; in reality, temperature events may happen frequently causing the fan Current Speed Level to change and the
Dynamic Minimum Fan Speed to gradually change.
Keysight M9506A 5-Slot AXIe Chassis User Guide
Configure Fan Control Features and Functions
At the beginning, assume the chassis is reporting a Nominal cooling status. The
Dynamic Minimum Fan Level is approximately the same as the fan Current Speed
Level. When one (or more) temperature sensors reports that a temperature has increased above its Nominal range and is now above its Upper Non-Critical threshold, a Minor Alert occurs on the cooling status. At this point, the chassis fan Current Speed Level begins ramping up to provide additional cooling. Note that the change is not instantaneous.
When the temperature sensors report that the temperature has dropped back into the Nominal range (because of hysteresis it is actually a few degrees below the Upper Non-Critical threshold), the chassis fan Current Speed Level begins to gradually slow down, compensating for the reduced heat load.
During this entire time, the Dynamic Minimum Fan Level algorithm is recalculating to provide a new minimum fan speed. As additional temperature events occur, and the Current Fan Level changes, the Dynamic Minimum Fan
Level algorithm recalculates the minimum fan speed required to ensure optimal cooling in the chassis.
Keysight M9506A 5-Slot AXIe Chassis User Guide 79
Features and Functions Configure Fan Control
Controlling Fan Speed
You can set the minimum fan level , over a range from 10 to 100 as a percentage of maximum fan speed, by setting that level in the Adjust Current Speed Level and
Dynamic Minimum Fan Level fields and clicking the Apply button. This specifies the minimum level at which you want the chassis fans to run. The Shelf Manager increases fan speed from that minimum if required by an alarm condition (low fan speed or high module temperature).
If the minimum fan speed is changed using the Web Interface, the newly-set value will become the chassis power-on default value. This is unlike other parameters set using the Web Interface, which do not persist through a power cycle. For more detailed information on controlling the fans using the Web
Interface, refer to
“Configure Fan Control” on page 77.
The power supply (PSU) fans are controlled automatically, you cannot manually override them.
80 Keysight M9506A 5-Slot AXIe Chassis User Guide
Self-Test
Self-Test
Features and Functions
The ESM supports two types of self-test:
– Power-on Self-Test (POST) – This test happens on the Shelf Manager as soon as the chassis powers up. As noted, this type of self-test is referred to as “POST”.
– After-POST self-test – This test is initiated by the user either via the SFP or programmatically using the Self-Test IVI call:
KtMAXIeMon.Utility.SelfTest(“TestResult”,”TestMessage”); .
Unless noted otherwise, references to “self-test” always refers to the self test that is either initiated from the SFP or initiated programmatically. The phrase
“self-test” does not refer to POST.
The front panel Status LED shows the following LED states:
– OFF - standby
– Green (blinking) - ESM/Shelf Manager is booting up and waiting for modules to be ready for enumeration
– Green (solid) - power up complete and ready for enumeration
– Red - failure/service required.
The power on self-test (POST) routines are automatically executed at power on.
If POST passes, the status LED will be solid green. If POST fails, the status LED continues blinking green.
If POST passed (the Status LED is green), and then self-test is subsequently run and fails, the Status LED begins blinking green. Similarly, if POST failed (Status
LED blinking green), but then if self-test is subsequently run and passes, the
Status LED turns solid Green.
Regardless of what causes the Status LED to blink green (a POST failure or a failure during running of self-test), it will turn solid green again if Self-Test is run and passes.
Self-test runs a series of tests and any failure generates an error consisting of an error code ( TestResult ) and error message ( TestMessage ).
A single Self-Test error queue in the ESM holds both the power-on self-test errors and the user-initiated self-test errors. Power-on Self-Test error messages are identified by the “(POST)” prefix; user-initiated self-test messages do not have a prefix.
Running the user-initiated self-test (either from the Soft Front Panel or programmatically) preserves any unread power-on test messages in the queue, but erases any other (user-initiated) unread messages before running the tests.
You can use the Soft Front Panel or the IVI Self-TestErrorQuery call to view the errors.
Keysight M9506A 5-Slot AXIe Chassis User Guide 81
Features and Functions Self-Test
When you open the Soft Front Panel’s Self-Test dialog box, any previous results are automatically displayed. If you then click the Run Self-Test button, the new self-test results are displayed below any previous results.
Refer to Chapter 8, Troubleshooting and Service on page 131 and
Self-Test Error Codes on page 149 for detailed information.
82 Keysight M9506A 5-Slot AXIe Chassis User Guide
GPS Synchronization Features and Functions
GPS Synchronization
The M9506A-GPS option adds GPS synchronization ability along with an external antenna port on the front panel. It provides an accurate 1 Pulse Per Second
(PPS) output; the 10/100 MHz reference can be locked to this clock. The PPS signal can be propagated to trigger I/O and trigger events can be timestamped.
Other GPS information is also provided including latitude, longitude, and altitude direction and speed.
– Propagate the 1 PPS output to modules via backplane trigger resources.
– GPS can generate up to 4 future trigger events at a specified time-stamp.
Event can be routed to any trigger resource tied to the crosspoint switch.
– GPS can time-stamp trigger events from any source with the
GPS-synchronized Time of Day (ToD). Trigger Events can be come from any trigger resource tied to the crosspoint switch.
Multiple M9506A ESMs with GPS Receivers
There is one preferred way to connect and synchronize multiple M9506A GPS receivers:
10 MHz Out
PCIe
To GPS
Antenna
Figure 22 Multiple M9506A Chassis with 1 GPS Master and 1 Slave GPS Receivers
10 MHz In
Keysight M9506A 5-Slot AXIe Chassis User Guide 83
Features and Functions Clocks and Triggering
Clocks and Triggering
Keysight’s M9506A AXIe chassis provides several triggering and timing options.
These allow you to achieve time-aligned operation of multiple instrument modules installed in the chassis.
Although the triggering and timing options can be inter-operated, it is easiest to understand them using distinct Clock Bus and Trigger Bus subsystems, each providing ESM front panel and backplane signal connections.
Some AXIe test system software applications, such as the Keysight AXIe Based
Logic Analyzer Software and modules, sets and uses specific trigger lines in the
AXIe chassis. Do not use the AXIe chassis Soft Front Panel (SFP) software to set or reroute any of the AXIe chassis trigger lines. Rerouting any of the trigger lines may cause the application software to not function correctly.
Block Diagram
The block diagram on the next page shows the overall clock and trigger subsystem used in the M9506A ESM. Each subsection is described in detail on the following pages. An Output cannot be assigned to itself as an Input; this is indicated by the “ X ” in the diagram. The default connection for the TRIG[0:11] lines is connected to STATIC0; this is indicated by a “ ” in the diagram.
Star Trigger Bus and Trigger Bus outputs can be inverted and enabled or disabled. Inverting bus lines are shown as a buffer superimposed over an inverter.This is shown as:
84
Figure 23 Inverting Trigger Bus Lines
Keysight M9506A 5-Slot AXIe Chassis User Guide
Clocks and Triggering
IG5 STR
IG4 STR
IG3
IG2 STR
IG1
STR
STR
Bi-directional
Bi-directional
TRIG4
TRIG5
TRIG6
TRIG7
TRIG8
TRIG9
TRIG10
TRIG11
TRIG0
TRIG1
TRIG2
TRIG3
TRIG11
TRIG10
TRIG8
TRIG7
TRIG9
TRIG6
TRIG3
TRIG2
TRIG5
TRIG4
TRIG1
TRIG0
STRIG2
STRIG3
STRIG1
STRIG4
STRIG5
Figure 24 Trigger Bus Subsystem
Keysight M9506A 5-Slot AXIe Chassis User Guide
Features and Functions
UT FANO
85
86
Features and Functions Clocks and Triggering
The following table provides a brief description of the timing and synchronization interface signals available on the ESM:
FCLK
CLK10_IN
The 100 MHz PCIe Reference clock to chassis backplane
10 MHz clock Input to the ESM front panel
CLK10_OUT 10 MHz clock Output from the ESM front panel
CLK100 The primary chassis clock. AXIe specifications require slot-to-slot skew to be less than 100 ps.
SYNC
TRIG[0:11]
STRIG[1:4]
The trigger/clock synchronization signal. Slot-to-slot skew is less than 100 ps.
Standard trigger lines to each backplane slot
Provides direct triggering between the ESM slot and each of the other instrument slots (no fanout). Slot-to-slot skew is less than 20 ps.
Available Clocks
Clock Outputs
The Embedded System Module (ESM) generates a 100 MHz instrument clock signal from its clock bus. This signal is:
– Star distributed to all instrument slots as CLK100
– Provided to the ESM’s front panel SMB connector CLOCK OUT , as a 10 MHz external reference clock (3.3V CMOS, 50 )
A separate 100 MHz distributed PCIe fabric reference clock ( FCLK ) is provided from the ESM to all instrument slots.
Clock Sources
There are two sources for the clock bus in a given chassis: the default internal source and the external 10MHz Clock In (SMB connector on ESM front panel). Clock detection logic is automatic, and the input source is chosen in the following priority order, depending on whether the external clock input is sensed:
1
2
The local 100 MHz clock oscillator within the ESM
A 10 MHz external reference clock ( CLOCK IN ) applied at the ESM’s front panel
SMB connector
Keysight M9506A 5-Slot AXIe Chassis User Guide
Clocks and Triggering Features and Functions
Clock Bus Diagram
The clock resources are illustrated below.
.
Selecting a Clock Bus Source
By default, the ESM’s internal clock bus is driven by the internal 100 MHz clock oscillator.
To use 10 MHz CLOCK IN
Connect a 10 MHz external reference clock source to drive the ESM 10MHZ In front panel SMB connector.
1 The chassis recognizes an external clock signal with these characteristics:
– AC coupled, -5V to +5V input
2
– 250 mV minimum swing
– frequency 10 MHz ± 100 ppm
The chassis automatically selects CLOCK IN if sensed .
To use 10 MHz CLOCK OUT
You can extend the clock bus output to instruments external to the AXIe chassis or chassis system.
The 10 MHz output is synchronous with the internal CLK100 signal.
1
2
Connect the external instrument’s clock input to the ESM’s front panel SMB
10 MHz OUT connector.
The 10 MHz Output must be enabled.
Keysight M9506A 5-Slot AXIe Chassis User Guide 87
Features and Functions Clocks and Triggering
Triggering
This section introduces the trigger bus resources and some of the many ways you may use them. Any AXIe instrument module can be triggered:
– internally, based on its own automation or signals from DUT connected directly to it
– through an externally applied trigger
– through the chassis backplane
Through the Crosspoint Switch, the AXIe chassis allows you to trigger instruments—singly, in groups, or all instruments in the chassis—from different signal sources. The diagram below shows how the triggering resources are derived .
88
The primary trigger resource is the Crosspoint Switch. It allows any trigger input to be connected to any trigger output.
Trigger Inputs
There are many inputs to the Crosspoint Switch. Any input can be connected to one or more trigger outputs. The inputs include:
– External trigger ports TRIG1 and TRIG2 applied at the ESM’s front panel
SMB connectors. Input characteristics: 3.3V CMOS drive, 100 mV minimum swing, 50 output termination.
– Any of the TRIG[0:11] signals. As these 12 lines are bidirectional, any AXIe module can source a trigger via the backplane. TRIG bus resources are allocated through E-Keying on the parallel trigger bus between two adjacent modules if they are designed for E-Keying (see
– Any of the five STRIG signals. As these lines are bidirectional, any AXIe module can source a trigger via the backplane using them.
– Software Trigger. A trigger signal generated on the ESM by driver software can be sourced to any of the trigger lines.
Keysight M9506A 5-Slot AXIe Chassis User Guide
Clocks and Triggering Features and Functions
Trigger Outputs
From the diagram above, note that the Crosspoint Switch can output trigger signals to any of the following:
– External trigger ports TRIG1 and TRIG2 driven from the ESM’s front panel
SMB connectors to external instruments. Drive characteristics: Push-Pull mode: 50 , 3.3 Vdc CMOS drive. Open Drain mode: pull-up to 3.3 Vdc through 318 .
– Any of the TRIG[0:11] signals. As these 12 lines are bi-directional, any AXIe module can source a trigger via the backplane. TRIG bus resources are allocated through E-Keying on the parallel trigger bus between two adjacent modules if they are designed for E-Keying (see
– Any of the five STRIG signals. As these lines are bidirectional, any AXIe module can source a trigger via the backplane using them.
– SYNC provides a trigger signal output at the next rising edge of CLK100 after the source trigger is received. This creates highly synchronous applications by triggering multiple instruments both simultaneously and in sync with the reference clock.The SYNC and CLK100 lines use fan out buffers and are trace length matched.
Each type of trigger output signal is explored in detail, after a closer look at the
Crosspoint Switch.
External Trigger Signal Conditioning
The following figure shows the external signal conditioning for the TRIG1 and
TRIG2 ESM SMB connectors. They are identical. Red lines and text in the table below, indicate the Open Drain mode for Trigger Output and 50 to Ground for
Trigger Input. The following specifications apply to both TRIG1 and TRIG2:
Keysight M9506A 5-Slot AXIe Chassis User Guide 89
Features and Functions Clocks and Triggering
Figure 25 TRIG1 and TRIG2 Signal Conditioning
Output Mode
Push Pull Mode
Open Drain Mode
Input Mode
Input Impedance
Input coupling
Input Level
Programmable Threshold
Output Impedance = 50
Output Swing = 3.3 V Unterminated
Output Coupling = DC
316 pulled up to 3.3 V
3k to 3.3 Vdc or 50 to GND
DC
±
5 V programmable threshold
~3 mV step size
90 Keysight M9506A 5-Slot AXIe Chassis User Guide
The Crosspoint Switch Features and Functions
The Crosspoint Switch
The M9506A ESM’s Crosspoint Switch, shown in the block diagram on
, provides the flexibility of routing many trigger signal events from AXIe instrument modules, external trigger, or a software-generated trigger to different destinations. You can enable and assign any of the input sources for any or all of signal destinations (trigger/timing resources). You can also source a logical 0 or
1 to force any destination low or high.
The M9506A Soft Front Panels are a good way to start learning about the
Crosspoint Switch. This utility offers basic switch control and other basic M9506A operations, such as running Self-Test. After the chassis drivers are installed, either SFP can be started from the Start menu as follows:
Start > Keysight > AXIe Chassis Monitor SFP
Start > Keysight > AXIe Chassis Trigger SFP
Outputs
Each of the Crosspoint Switch outputs (see the Trigger Subsystem and block diagram beginning on
page 84 ) can be enabled and driven independently.
An output must be enabled before it can be used as an output.
Inputs
Any of the Crosspoint Switch inputs (see the Trigger Subsystem and
block diagram beginning on page 84
) can be assigned to any output, except that you cannot assign the same input as the output. If multiple input sources are specified for an output line, the sources are logically ORed together to produce the signal on that output line.
The default input for all outputs is “Static 0”. If you don’t specify the input signal for a specific output signal, the input signal will be logic 0 by default for that output signal.
Keysight M9506A 5-Slot AXIe Chassis User Guide 91
Features and Functions The Crosspoint Switch
Connecting an Input to an Output in the Crosspoint Switch
This section describes how to programmatically connect one or more Crosspoint
Switch inputs to an output. In the M9506A Soft Front Panel, this is shown symbolically as a “dot” connecting the desired input to the output. In the example diagram below, the dot shows the input signal.
Figure 26 Trigger Soft Front Panel Crosspoint Switch
92 Keysight M9506A 5-Slot AXIe Chassis User Guide
The Crosspoint Switch Features and Functions
Monitoring Crosspoint Switch Outputs
Each of the Crosspoint Switch outputs (see Figure 26
) can be enabled and driven independently. An output must be enabled before it can be used as an output.
Monitoring Crosspoint Switch Inputs
Any of the Crosspoint Switch inputs (see Figure 26 ) can be assigned to any
output, except that you cannot assign the same input as the output. The X’s on the Crosspoint Switch diagram indicate disallowed connections.
The default input for all outputs is “Static 0”. If you don’t specify the input signal for a specific output signal, the input signal will be logic 0 by default for that output signal.
OR-ing and AND-ing of Input Signals
When multiple Crosspoint Switch input signals are connected to a single output line, the signals are logically ORed together to produce the signal on that output line. That is, when any of the inputs are logic “1”, the output will be logic “1”. The truth table for a two-input OR gate is shown below.
By inverting both inputs and the output of an OR gate, the equivalent of an AND gate is achieved, even though the Crosspoint Switch is still performing an OR function internally. That is, when all inputs are logic “1”, the output will be logic
“1”. The truth table for a two-input AND gate is shown below.
Keysight M9506A 5-Slot AXIe Chassis User Guide 93
Features and Functions The Crosspoint Switch
The table below shows how inverting the inputs and outputs of an OR gate produces the truth table of an AND gate.
94 Keysight M9506A 5-Slot AXIe Chassis User Guide
PCIe and LAN Switching (Data Transfer) Features and Functions
PCIe and LAN Switching (Data Transfer)
Data Channels Explained
The AXIe chassis provides four paths for communication and data transfer to and from installed modules:
– Gigabit (Gb) Ethernet
– PCIe
– Thunderbolt 3
Gigabit (Gb) Ethernet
This is a star-distributed 1 Gb Ethernet:
– From the LAN switch in the ESM—the base channel hub—to each slot.
– From the LAN switch in the ESM to the RJ45 front panel LAN connection;
10/100/1000BASE-TX.
PCIe
This is the high speed primary data path:
– From the PCIe switch in the ESM—the fabric 1 hub—four lanes to each instrument slot through the backplane defined as PCIe x16.
– From the PCIe switch in the ESM to two PCIe x8 front panel connections.
Thunderbolt 3
Thunderbolt 3 provides one PCIe interface using a USB-C
Connector. The ESM front panel PCIe ports are disabled when using the
Thunderbolt port .
Maximizing Data Upload Speeds
The maximum data bandwidth to each slot is dictated by the x16 connection.
You will typically achieve higher PCIe data throughput to a remote (desktop or rackmount) host PC than to an embedded controller.
– Using a high speed rackmount or desktop PC and one or two x8 cables, the primary data fabric utilizes a x8 or x16 connection between the ESM and the host PC. The ESM’s PCIe switch can achieve Gen3 upload speeds when transferring data to the host from multiple modules simultaneously.
– If an embedded controller is installed in the chassis, the ESM front panel
PCIe x8 connections become downstream facing and can connect to other chassis. The embedded controller uses its backplane PCIe x16 link to link the ESM PCIe switch.
Keysight M9506A 5-Slot AXIe Chassis User Guide 95
Features and Functions PCIe and LAN Switching (Data Transfer)
Thunderbolt, PCIe, or LAN?
You can establish communication between the chassis and host PC over a PCIe,
Thunderbolt, or LAN connection. In practice, the choice is usually driven by the interface(s) on your modules. For example, if you have a module with a PCIe interface, you’ll want to establish a PCIe connection to the chassis.
Thunderbolt
Thunderbolt 3 with USB-C Thunderbolt 3 provides bi-directional, four lanes of PCIe Gen 3 * . The ESM front panel PCIe ports are disabled when using the Thunderbolt port
.
PCIe Connection Only
You may connect the ESM to the host PC using only a
PCIe cable. This allows both the base (LAN) channel and fabric 1 data channels.
Base channel communication between PC, ESM and any LAN capable installed instruments are made through the PCIe connection. A PCIe to LAN switch in the
ESM manages the base channel communication to the slots; it is seen as a network interface device by Windows Device Manager.
LAN Connection Only
You may connect ESM to host PC using only a LAN cable. You will have base channel communication only and significantly less data throughput than when using PCIe.
Hybrid Operation
You may connect both LAN and PCIe cables from ESM to host PC. This provides the most operational flexibility and some data throughput advantages over using only PCIe. The ESM front panel PCIe ports are disabled when using the Thunderbolt port
.
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* Thunderbolt 3 also provides eight lanes of DisplayPort 1.2 and native USB 3.1. However, these features are not supported on the M9506A ESM.
Keysight M9506A 5-Slot AXIe Chassis User Guide
Electronic Keying (E-Keying) Features and Functions
Electronic Keying (E-Keying)
Electronic keying is one of several capabilities AXIe inherits from the
AdvancedTCA architecture. Like ATCA, AXIe promotes a fabric independent (also known as fabric-agnostic) backplane with respect to local bus connectivity.
Each module plugged into a chassis may provide various communication protocols and hardware signaling that connect to pins on the backplane that link adjacent modules together. In general, the backplane itself does not provide internal buffering, so a link connection between two adjacent modules is simply a wired connection, either configured point to point or tied together on a common bus. This allows different modules in the system to establish their own link protocols provided a connection path exists.
This flexibility frees the chassis configuration from dictating signal levels and protocols involved with any particular link. However, this flexibility presents a challenge – how to know whether the endpoints of a link are compatible or not.
If you have modules in your system that are E-Keying compatible, refer to the documentation provided with your modules for detailed installation information.
E-Keying is a process in which compatible matches over links between different modules are identified and enabled to be used. The E-Keying process is handled by the chassis shelf manager. Each module in the chassis runs a Intelligent
Platform Manager Controller (IPMC). These IPMCs interface with the shelf manager and each other using the Intelligent Platform Management Bus (IPMB).
IPMB is basically a side channel protocol built on top of I2C that connects all modules in a chassis together. See the graphic below.
Keysight M9506A 5-Slot AXIe Chassis User Guide 97
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Features and Functions Electronic Keying (E-Keying)
The shelf manager has two primary roles:
– Manage the inventory and infrastructure of a chassis by communicating with IPMCs in the chassis:
-- Power requirements of the modules and managing the power module.
-- Chassis cooling control of the fan module.
-- Individual Field Replaceable Unit (FRU) module.
*
inventory located in non-volatile memory that tracks ATCA and AXIe attributes from each
-- E-Keying interconnection resources among modules.
-- Point-to-point (P2P) connections for base, fabric, and update channel interfaces. P2P connections are predominately what AXIe is concerned with.
-- Bussed resources for clock and metallic test bus (in ATCA).
– External connectivity to a system manager, using an IPMI connection over
Ethernet using a RMCP protocol.
E-Keying Process
When the chassis powers on, the first step the shelf manager does in point-to-point (P2P) E-Keying is read the backplane P2P connectivity records from the chassis modules. These connectivity records specify the P2P interconnections the backplane routes between specific slots and specific channels on each slot.
Next, for each board loaded in the chassis, the shelf manager reads each board's
Field Replaceable Unit (FRU) table for the P2P connections that board makes to the backplane. The shelf manager builds up a connection inventory of all the potential links a particular board can implement. This list is later used to examine the potential logical links each board has to other boards. Each potential link end has a link descriptor that identifies the following information:
– P2P interface on the backplane and a channel number within that interface
– The ports on a given channel that are involved with this link. This may include sets of differential signal pairs.
– Finally, the link type which identifies the specification entity, such as
PICMG 3.x, AXIe 1.0, or other specification that fully describes the link classification. The link type may also be an OEM-defined value using a
128-bit Globally Universal Identifier (GUID); each card may support up to
15 different GUIDs.
* A field replaceable unit is a part that may be removed from a system and exchanged with another part or returned to a factory for service. Examples of FRUs may be a module card in a chassis slot, a fan tray, a power supply, and the chassis frame.
Keysight M9506A 5-Slot AXIe Chassis User Guide
Electronic Keying (E-Keying) Features and Functions
The shelf manager goes through the backplane connection possibilities, identifying each end of a P2P connection and searches for a compatible link descriptors. If a pair of ends match, such as both ends are PCIe Express x4, then the shelf manager issues a “Set Port State (enable)” command to each board for that link. For the matches that are not found, the shelf manager issues a “Set
Port State (disable)” command to ensure that incompatible link connections are kept off.
As a final note, the shelf manager is truly agnostic about specific details of a link protocol. This permits new protocols to be added without modification to the chassis.
For additional information on E-Keying, refer to the AdvancedTCA specification
( http://www.picmg.org
) and the AXIe specification
(http://www.axiestandard.org
).
Keysight M9506A 5-Slot AXIe Chassis User Guide 99
Features and Functions Chassis Inhibit and Voltage Monitoring
Chassis Inhibit and Voltage Monitoring
The method of powering up the chassis depends on the position of the INHIBIT rear panel switch, which can be set to the DEF (default) position or to the MAN
(manual) position). These two methods work as follows:
– INHIBIT switch in the DEF position — In this position, the ESM front panel power push button switches the chassis between ON and Standby—hence, this push button is known as the ON/Standby push button.
– INHIBIT switch in the MAN position — In this position, the Inhibit signal (pin 5 on the rear panel DB-9 connector) controls chassis power. The chassis is powered up by applying a logic high signal to the Inhibit pin. When the
Inhibit pin (pin 5) is pulled low, the chassis is in Standby.
Chassis Inhibit Switch
DB9 Connector for measuring
PSU voltage rails
100
Figure 27 Chassis Power Inhibit Switch, DB9 Connector, Power Sync Connectors
If you’re using the Inhibit input signal on the rear panel INHIBIT/VOLTAGE MON
DB-9 connector and if this signal doesn’t power up the chassis, check the voltage that is being applied to the Inhibit signal. This signal is active low, meaning that a 0 VDC signal inhibits operation of the PSUs and the chassis is in
Standby mode. A logic high turns on the PSUs. Use a DMM to verify that the signal you’re providing to the Inhibit input on the DB-9 connector is truly switching between logic high and low.
Because there is an internal pull-up resistor on the Inhibit signal, an open circuit
(no signal connected) on the Inhibit signal will also turn on the power supply.
This means that, if the INHIBIT switch is set to the MAN position and if no signal is connected to the Inhibit input signal, the chassis will power up as soon as AC power is applied.
Power Sync and the two connectors are described in
“Multi-Chassis Power Sync” on page 114.
Keysight M9506A 5-Slot AXIe Chassis User Guide
Using the M9506A AXIe Zone 3 Area Features and Functions
Using the M9506A AXIe Zone 3 Area
The AXIe Zone 3 allows for cable access through the rear of the chassis, custom analog backplanes between modules, etc. Keysight’s M9506A AXIe chassis allows full access to Zone 3 for all five chassis slots.
Most AXIe chassis and AXIe modules do not provide ZONE 3 access. Use caution when designing modules that require Zone 3 access.
Zone 3 Filler Panels
(remove from rear of chassis)
Figure 28 M9506A AXIe Zone 3 from the chassis front
Removing the Zone 3 Filler Panels
To access the Zone 3 Filler Panels, first remove the rear panel Zone 3 Access
Cover. Refer to
Then, remove individual Slot 2, 3, 4 and 5 Zone 3 Slot Filler Panels. See
Figure 30 on page 102. This provides an open area of approximately 139.4 mm wide x
114.9 mm high x 170.6 mm deep for cables, custom backplane, etc.
To remove the Slot 1 (bottom) Zone 3 Filler Panel, you need to remove the
M9506A Power Supply Tray. See
Figure 31 . Removing the Slot 1 (bottom) Zone 3
Filler Panel provides a small, additional space for Slot 1 cables, custom backplane, etc. Loosen the nine screws and then slide out the Power Supply
Tray.
For proper chassis and module cooling, all unused Zone 3 slots must have the Zone 3 Filler Panels in place.
Keysight M9506A 5-Slot AXIe Chassis User Guide 101
Features and Functions
To prevent possible injury or damage, always replace the Zone 3 access cover after installing custom backplanes, cables, etc.
Zone 3 Access Cover
Loosen six screws to remove the Zone 3 access cover
Figure 29 M9506A Rear Panel Zone 3 Access Cover
Zone 3 Filler Panels.
To remove a panel, remove the three Torx T10 screws securing the panel.
Zone 3 Cooling Fan
Using the M9506A AXIe Zone 3 Area
Figure 30 M9506A AXIe Zone 3 Filler Panels viewed from the rear of the chassis
102 Keysight M9506A 5-Slot AXIe Chassis User Guide
Using the M9506A AXIe Zone 3 Area Features and Functions
Loosen nine screws to remove the power supply
Figure 31 Loosen nine screws to remove Power Supply Tray for access to Slot 1 Zone 3 access cover
Figure 32 Pull Out the Power Supply Tray to Access Slot 1 Zone 3 Filler Panel
Keysight M9506A 5-Slot AXIe Chassis User Guide 103
Features and Functions Using the M9506A AXIe Zone 3 Area
104 Keysight M9506A 5-Slot AXIe Chassis User Guide

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