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C141-E090-01EN 3 - 9
3.3.4 Power supply connector (CN1)
Figure 3.9 shows the pin assignment of the power supply connector (CN1).
(Viewed from cable side)
4321
+5VDC
+5V RETURN
+12V RETURN
+12VDC
4
3
2
1
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 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.