Ide Interface Connectors - NEC POWERMATE P - SERVICE MANUAL 1996 Service And Reference Manual

A-10 Connector Pin Assignments

IDE INTERFACE CONNECTORS

All signal levels in the IDE interface are TTL compatible. A logic 1 is a signal whose
voltage level is between 2.0 and 5.0 V. A logic 0 is a signal measuring between 0.00 V and
0.70 V.
The two system board IDE connectors are physically identical. Electrically the primary
IDE/PCI bus IDE connector is faster and the secondary IDE/PCI connector is slower. Table
Appendix A-11 provides the IDE pin assignments. All signals on the Host interface have the
prefix HOST. All negatively active signals are further prefixed with a "-" designation. All
positively active signals are prefixed with a "+" designation.
Table Appendix A-11 IDE/PCI Connector Pin Assignments
Pin Signal
01 HOST RESET
03 +HOST DATA 7
05 +HOST DATA 6
07 +HOST DATA 5
09 +HOST DATA 4
11 +HOST DATA 3
13 +HOST DATA 2
15 +HOST DATA 1
17 +HOST DATA 0
19 GND
21 DRQ3
23 HOST IOW
25 HOST IOR
27 IOCHRDY
29 DACK3
31* +HOST IRQ14
33 +HOST ADDR 1
35 +HOST ADDR 0
37 HOST CSO
39 HOST SLV/ACT
*The Primary IDE/PCI connector uses IRQ15
Pin Signal
02 GND
04 +HOST DATA 8
06 +HOST DATA 9
08 +HOST DATA 10
10 +HOST DATA 11
12 +HOST DATA 12
14 +HOST DATA 13
16 +HOST DATA 14
18 +HOST DATA 15
20 KEY
22 GND
24 GND
26 GND
28 +HOST ALE
30 GND
32 HOST IO16
34 GND
36 +HOST ADDR 2
38 HOST CS1
40 GND