System Configuration For Ultra Dma - Fujitsu MPD3XXXAT Product Manual

3.3.4 Power supply connector (CN1)
Figure 3.9 shows the pin assignment of the power supply connector (CN1).
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(Viewed from cable side)
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 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
Cable capacitance: typical 57 pF/m
4) The dimensions are shown in Figure 3.10.
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4
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4
Figure 3.9 Power supply connector pins (CN1)
C141-E069-02EN
+12VDC
+12V RETURN
+5V RETURN
+5VDC
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