Compaq W4000 manual Pin Primary IDE Connector Pinout, Pin Signal Description

Technical Reference Guide

5.2.2 IDE CONNECTOR

This system uses a standard 40-pin connector for the primary IDE device and connects (via a cable) to the hard drive installed in the right side drive bay. Note that some signals are re-defined for UATA/33 and higher modes, which require a special 80-conductor cable (supplied) designed to reduce cross-talk. Device power is supplied through a separate connector.

Figure 5-1.40-Pin Primary IDE Connector (on system board).

Table 5–3. 40-Pin Primary IDE Connector Pinout

Table 5-3.

40-Pin Primary IDE Connector Pinout

Pin	Signal	Description	Pin	Signal	Description
1	RESET-	Reset	21	DRQ	DMA Request
2	GND	Ground	22	GND	Ground
3	DD7	Data Bit <7>	23	IOW-	I/O Write [1]
4	DD8	Data Bit <8>	24	GND	Ground
5	DD6	Data Bit <6>	25	IOR-	I/O Read [2]
6	DD9	Data Bit <9>	26	GND	Ground
7	DD5	Data Bit <5>	27	IORDY	I/O Channel Ready [3]
8	DD10	Data Bit <10>	28	CSEL	Cable Select
9	DD4	Data Bit <4>	29	DAK-	DMA Acknowledge
10	DD11	Data Bit <11>	30	GND	Ground
11	DD3	Data Bit <3>	31	IRQn	Interrupt Request [4]
12	DD12	Data Bit <12>	32	IO16-	16-bit I/O
13	DD2	Data Bit <2>	33	DA1	Address 1
14	DD13	Data Bit <13>	34	DSKPDIAG	Pass Diagnostics
15	DD1	Data Bit <1>	35	DA0	Address 0
16	DD14	Data Bit <14>	36	DA2	Address 2
17	DD0	Data Bit <0>	37	CS0-	Chip Select
18	DD15	Data Bit <15>	38	CS1-	Chip Select
19	GND	Ground	39	HDACTIVE-	Drive Active (front panel LED) [5]
20	--	Key	40	GND	Ground

NOTES:

[1]On UATA/33 and higher modes, re-defined as STOP.

[2]On UATA/33 and higher mode reads, re-defined as DMARDY-. On UATA/33 and higher mode writes, re-defined as STROBE.

[3]On UATA/33 and higher mode reads, re-defined as STROBE-. On UATA/33 and higher mode writes, re-defined as DMARDY-.

[4]Primary connector wired to IRQ14, secondary connector wired to IRQ15.

[5]Pin 39 is used for spindle sync and drive activity (becomes SPSYNC/DACT-) when synchronous drives are connected.

Compaq Evo and Workstation Personal Computers 5-3

Featuring the Intel Pentium 4 Processor

Second Edition - January 2003