Ide Interface Connectors - NEC POWERMATE VE - SERVICE MANUAL 08-1996 Service Manual

A-8 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
A-10 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.
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
Table A-10 IDE/PCI Connector Pin Assignments
Pin
02
04
06
08
10
12
14
16
18
20
22
24
26
28
30
32
34
36
38
40
Signal
GND
+HOST DATA 8
+HOST DATA 9
+HOST DATA 10
+HOST DATA 11
+HOST DATA 12
+HOST DATA 13
+HOST DATA 14
+HOST DATA 15
KEY
GND
GND
GND
+HOST ALE
GND
HOST IO16
GND
+HOST ADDR 2
HOST CS1
GND