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3.4.4
Power supply connector (CN1)
Figure 3.10 shows the pin assignment of the power supply connector (CN1).
1
2
3
(Viewed from cable side)
3.4.5
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 common 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 3.11.
3 - 10
1
2
4
3
4
Figure 3.10 Power supply connector pins (CN1)
C141-E106-01EN
+12VDC
+12V RETURN
+5V RETURN
+5VDC
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