P4 Connector - Xycom XVME-653 Manual

P4 Connector

P4 connects up to two 2.5" hard drives. Power for the drives is supplied by the connec-
tor.
The IDE controller supports enhanced PIO modes, which reduce the cy-
cle times for 16-bit data transfers to the hard drive. Check with your
drive manual to see if the drive you are using supports these modes. The
higher the PIO mode, the shorter the cycle time. As the IDE cable length
increases, this reduced cycle time can lead to erratic operation. As a re-
sult, it is in your best interest to keep the IDE cable as short as possible.
The PIO modes are selected in the BIOS setup (see p. 3-4). The Auto-
config will attempt to classify the connected drive if the drive supports
the auto ID command. If you experience problems, change the Transfer
Mode: to Standard.
The total cable length must not exceed 18 inches. If two drives are con-
nected, they must be no more than six inches apart.
Table 5-4 XVME-973/1 P4 Connector Pinout
Pin Signal
1 HDRSTDRV*
2 GND
3 HD7
4 HD8
5 HD6
6 HD9
7 HD5
8 HD10
9 HD4
10 HD11
11 HD3
12 HD12
13 HD2
14 HD13
15 HD1
16 HD14
17 HD0
18 HD15
19 GND
20 NC
21 HDRQ
22 GND
Caution
Caution
Chapter 5 – XVME-973/1 Drive Adapter Module
Pin Signal
23 DIOW*
24 GND
25 DIOR*
26 GND
27 IORDY
28 ALE
29 HDACK*
30 GND
31 IRQ14
32 IOCS16*
33 DA1
34 NC
35 DA0
36 DA2
37 CS1P*
38 CS3P*
39 IDEATP*
40 GND
41 +5V
42 +5V
43 GND
44 NC
5-5