3.3 Cable Connections. Fujitsu C141-E090-02EN

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3.3 Cable Connections. Fujitsu C141-E090-02EN | Manualzz

3.3

Cable Connections

3.3.1

Device connector

The disk drive has the connectors and terminals listed below for connecting external devices.

Figure 3.7 shows the locations of these connectors and terminals.

Power supply connector (CN1)

ATA interface connector (CN1)

Power supply connector (CN1)

Mode

Setting

Pins

ATA interface connector

Figure 3.7

Connector locations

C141-E090-01EN 3 - 7

3.3.2

Cable connector specifications

Table 3.2 lists the recommended specifications for the cable connectors for Host system that do not support Ultra DMA modes greater than mode 2.

For Host system that support Ultra DMA modes greater than mode 2, it is recommended to use the 80-conductor cable assembly. The 80-conductor cable assembly is manufactured by

AMP or 3M.

ATA interface cable

(40-pin, CN1)

Table 3.2

Cable connector specifications

Name

Cable socket

(closed-end type)

Cable socket

(through-end type)

Cable socket housing

Contact

Model

FCN-707B040-AU/B

FCN-707B040-AU/O

1-480424-0

60617-4

Manufacturer

Fujitsu

Fujitsu

Power supply cable

(CN1)

AMP

AMP

Note :

The cable of twisted pairs and neighboring line separated individually is not allowed to use for the host interface cable. It is because that the location of signal lines in these cables is not fixed, and so the problem on the crosstalk among signal lines may occur.

It is recommended to use the ribbon cable for ATA interface that cable length is less than

18 inch (46 cm) and cable capacitance is less than 35 pico farad. Also it is recommended to use AWG18 power supply cable.

3.3.3

Device connection

Figure 3.8 shows how to connect the devices.

Host system

ATA interface cable

Disk Drive #0

Power supply cable

DC power supply

3 - 8

Disk Drive #1

Figure 3.8

Cable connections

C141-E090-01EN

3.3.4

Power supply connector (CN1)

Figure 3.9 shows the pin assignment of the power supply connector (CN1).

1 2 3 4

1

2

3

4

+12VDC

+12V RETURN

+5V RETURN

+5VDC

(Viewed from cable side)

Figure 3.9

Power supply connector pins (CN1)

3.3.5

System configuration for Ultra DMA

Host system that support Ultra DMA transfer modes greater than mode 2 shall not share I/O ports. They shall provide separate drivers and separate receivers for each cable.

a) The 80-conductor cable assemblies shall be used for systems operating at Ultra DMA modes greater than 2. The 80-coductor cable assemblies may be used in place of 40conductor cable assemblies to improve signal quality for data transfer modes that do not require an 80-conductor cable assembly. And the 80-conductor cable assembly shall meet the following specifications.

1) The assembly utilizes a fine pitch cable to double the number of conductors available to the 40-pin connector. The grounds assigned by the interface are commoned with the additional 40 conductors to provide a ground between each signal line and provide the effect of a common ground plane.

2) The cable assembly may contain up to 3 connectors which shall be uniquely colored as follows. All connectors shall have position 20 blocked.

The System Board Connector shall have a Blue base and Black retainer. Pin 34

(PDIAG-: CBLID-) shall be connected to ground and shall not be wired to the cable assembly.

Connector Device “0” shall have a Black base and Black retainer.

Connector Device “1” shall have a Gray base and Black retainer. Pin 28 (CSEL) shall not be connected to the cable (contact 28 may be removed to meet this requirement).

The cable assembly may be printed with connector identifiers.

3) Typical cable characteristics are shown as follows.

Cable: AWG 30 (pitch: 0.635 mm)

Single Ended impedance: typical 80

.

Cable capacitance: typical 57 pF/m

4) The dimensions are shown in Figure 3.10.

C141-E090-01EN 3 - 9

Pin 40 (Ground)

Pin 34

Pin 30 (Ground)

Pin 26 (Ground)

Pin 24 (Ground)

Pin 22 (Ground)

Pin 19 (Ground)

Pin 2 (Ground)

System Board

Connector

127.0 to 304.8 mm

(5 to 12 inch)

254.0 to 457.2 mm

(10 to 18 inch)

101.6 to 152.4 mm

(4 to 6 inch) open

Symbolizes Pin 34

Conductor being cut

Position 1

Pin 34 contact

(PDIAG-:CBLID- signal)

Connector 1 Connector 2

Figure 3.10 Cable configuration

b) Host system that do not support Ultra DMA modes greater than mode 2 shall not connect to the PDIAG-:CBLID- signal.

c) Host system that do support Ultra DMA modes greater than mode 2 shall either connect directly to the device without using a cable assembly, or determine the cable assembly type. Determining the cable assembly type may be done either by the host sensing the condition of the PDIAG-:CBLID- signal (see Figure 3.11), or by relying on information from the device (see Figure 3.12). Hosts that rely on information from the device shall have a 0.047

µ

F capacitor connected from the PDIAG-:CBLID- signal to ground. The tolerance on this capacitor shall be 20% or less.

3 - 10 C141-E090-01EN

Host detected CBLID- above V

IH

PDIAG-: CBLID- conductor

Host detected CBLID- below V

IL open

PDIAG-: CBLID- conductor

Host Device 1 Device 0 Host Device 1 with 40-conductor cable with 80-conductor cable

Figure 3.11 Cable type detection using CBLID- signal

(Host sensing the condition of the CBLID- signal)

Device 0

IDENTIFY DEVICE information word 93 bit13:0

Device detected CBLID- below V

IL

PDIAG-:CBLID- conductor

IDENTIFY DEVICE information word 93 bit13:1

Device detected CBLID- above V

IH open

PDIAG-:CBLID- conductor

Host

0.047

µ

F

±10% or

±20%

Device 1 with 40-conductor cable

Device 0 Host

0.047

µ

F

±10% or

±20%

Device 1 with 80-conductor cable

Device 0

Figure 3.12 Cable type detection using IDENTIFY DEVICE data

(Device sensing the condition of the CBLID- signal)

C141-E090-01EN 3 - 11

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