Fujitsu C141-E090-02EN 用户手册

C141-E090-01EN

3 - 9

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

(Viewed from cable side)

4

3

2

1

+5VDC

+5V RETURN

+12V RETURN

+12VDC

4

3

2

1

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 40-
conductor 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 

Ω

.

• 

Cable capacitance: typical 57 pF/m

4)

The dimensions are shown in Figure 3.10.