EVB-USB2524 Evaluation Board Revision B1

EVB-USB2524 Evaluation Board Revision B1
EVB-USB2524 Evaluation
Board Revision B1
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SMSC EVB-USB2524
Revision 0.9 (09-28-06)
EVB-USB2524 Evaluation Board Revision B1
1 Overview
The SMSC USB2524 MultiSwitchTM is an USB2.0 compliant switching hub with two up-stream ports
and four down-stream ports. The EVB-USB2524 Evaluation Board demonstrates a stand alone
application for the switching hub with all the features listed below. Each of the down stream ports can
individually be assigned to up-stream port 1 or up-stream port 2. The port assignment can be
dynamically changed with user accessible switches individually for each port.
1.1
1.2
Features
„
Operates from a single voltage (+5.0V, regulated) 'wall wart' external power supply
„
Low Cost 2-Layer Design
„
Self-powered operation
„
Multi-TT enabled
„
Supports four program selection options: Internal defaults, EEPROM (default), SMBus, Strapping
options
„
Serial EEPROM for configuration in a socket for easy programming
„
Single Onboard +3.3V Regulator
„
LED status modes supported: USB, BASIC, and DUAL LED
„
Single Crystal Clock Source
„
Individual port over-current sensing
„
Individual port power control
„
High-speed, Full-speed, and Low-speed capable
„
Port Assignment interface
„
Port OCS/Port Power Control interface
„
Optional ESD and EMI footprints are provided
General Description
The EVB-USB2524 is a demonstration and evaluation platform featuring the USB2524 MultiSwitchTM 4-port USB2.0
Switching Hub. It is designed to robustly demonstrate this unique device's features using a low-cost PCB
implementation.
The EVB-USB2524 features an on-board EEPROM for VID/PID/DID and configuration strings, such as switching
options, LED status options, and non-removable or disabled configuration for each port. The manufacturer, product
and serial strings for the hub can be changed in the EEPROM as well.
The EVB-USB2524 can also be configured through changing population of resistors to access internal “strapping
options”, without using the EEPROM.
The schematic for the EVB-USB2524 indicates which components are required for each configuration option.
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2 Getting Started
2.1
Port Assignment
The EVB-USB2524 port assignments are selected by four level switches SW1 to SW4 located in the
upper right-hand corner. When only one up-stream port, “US 1” or “US 2” is connected to an
operational host, all down-stream ports will be assigned to that host. In this case the switches do not
have any effect. When both up-stream ports are connected to operational hosts “US 2” is selected with
switch in the bottom position and “US 1” with the switch in the top position. Figure 2.1 shows the
switches in detail.
Down-stream ports are numbered 1 through 4. The switches are labeled accordingly with the left-most
switch controlling down-stream port 1 and the right-most switch close to the supply connector
controlling down-stream port 4.
Figure 2.1
SMSC EVB-USB2524
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EVB-USB2524 Evaluation Board Revision B1
3 Hardware Configuration
The EVB-USB2524 has two sets of resistor jumpers. The first set selects the USB2524 configuration;
internal defaults, SMBus slave or EEPROM configuration. The second set enables dual LED mode.
3.1
USB2524 Configuration Selection
The USB2524 has three configuration pins CFG_SEL[2:0], that determines the operating mode of the USB2524. The
selection of a configuration is done with six resistor combinations shown in Table 3.1. Only three resistors are
installed to either pull up or pull down each configuration pin. Figure 3.1 shows a section of the PCB for the EVBUSB2524 where the resistors are located.
Table 3.1 Resistor selection for USB2524 configuration
CFG_SEL2
R1
CFG_SEL1
R3
CFG_SEL0
R6
Configuration
Internal Default Configuration
„
3-wire port configuration
„
Strap options enabled
„
USB LED mode
R1
R3
R5
SMBus Slave Configuration
R1
R4
R6
Internal Default Configuration
R1
R4
R5
R2
R3
R3
R6
R5
„
Strap options enabled
„
USB LED mode
This is default if no jumpers are populated
on J1
Internal Default Configuration
„
4-wire (edge) port configuration
„
Strap options enabled
„
Single mode LED
Internal Default Configuration
R2
R4
R6
Reserved
R2
R4
R5
Reserved
Revision 0.9 (09-28-06)
4-wire port configuration
EERPOM Configuration
Note:
R2
„
„
4-wire (edge) port configuration
„
Dual mode LED
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EVB-USB2524 Evaluation Board Revision B1
Figure 3.1 Location of resistors for configuration of USB2524.
3.2
LED Configuration
The USB2524 supports three different modes for LED indicators: USB, Basic and DUAL LED. The EVB-USB2524 is
configured for Basic LED operation, which means that eight LEDs are used to signal port assignment. Each downstream port has one green and one red LED. When the port is assigned to up-stream port 1 the green LED is lit.
When the port is assigned to up-stream port 2 the red LED is lit.
3.2.1
Resistors for Dual LED operation
The USB2524 also supports Dual LED mode. This mode indicates up-stream port assignment and speed of device
plugged into the down-stream port.
To enable dual LED operation resistors R38 and R41 must be installed. Both resistors should be 0 ohms. The
USB2524 must also be reconfigured either by changing the configuration pin selection (see table 3.1) or by changing
the contents of the EEPROM.
In the Dual LED configuration port speed is signalled along with port assignment. With two dual color (green/red)
LEDs one each for upstream port 1 and upstream port 2 assignment. The interpretation of the color coding for the
LEDs are defined in table 3.2.
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Revision 0.9 (09-28-06)
EVB-USB2524 Evaluation Board Revision B1
Table 3.2 Dual LED Configuration color coding
Green
Red
Port Status
OFF
OFF
Un-assigned/OFF
OFF
ON
Port is assigned and operating at LS/FS speed
ON
OFF
Port is assigned and operating at High speed
ON
ON
Port is assigned to unattached upstream port
Note:
Revision 0.9 (09-28-06)
The USB2524 sends a continuos 1kHz
pulse train in this state.
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EVB-USB2524 Evaluation Board Revision B1
4 Connector Description
The EVB-USB2524 has a standard set of USB style connectors, two of type B for upstream ports and
four of type A for downstream ports. Power is supplied via a 2.0 mm power jack. There are three pin
strip header blocks for external hardware to access the USB2524. Table 4.1 lists all the connectors.
For more details on the pinout of the connectors please see the schematic. The locations of connectors
and components are shown in figure 4.1.
Table 4.1
Connector
Type
J3
USB B
Upstream Port 1
J4
USB B
Upstream Port 2
J18
USB A
Downstream Port 1
J19
USB A
Downstream Port 2
J20
USB A
Downstream Port 3
J21
USB A
Downstream Port 4
J2
Power Jack 2.0mm
+5V Power Supply
J5
Pin Strip 1 x 2
+5V Power Supply
J6
Pin Strip 2 x 5
SMBus/Configuration Control
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Revision 0.9 (09-28-06)
EVB-USB2524 Evaluation Board Revision B1
Figure 4.1 EVB-USB2524 PCB layout
Revision 0.9 (09-28-06)
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SMSC EVB-USB2524
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