Compaq W4000 Manual De Usuario

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 

 

 

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.

  

 

 

5-3