Fujitsu MPD3XXXAT manual Power supply connector CN1, +12V Return +5V Return

3.3.4Power supply connector (CN1)

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

1 2 3 4

(Viewed from cable side)

1+12VDC

2+12V RETURN

3+5V RETURN

4+5VDC

Figure 3.9 Power supply connector pins (CN1)

3.3.5System 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 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.

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