Compaq W4000 Manual De Usuario

Chapter 5  Input/Output Interfaces 

Hard drives types not found in the ROM’s parameter table are automatically configured as to 
(soft)type by DOS as follows: 
 
Primary controller: drive 0, type 65;  drive 1, type 66 
Secondary controller: drive 0, type 68; drive 1, type 15 

 

Non-DOS (non-Windows) operating systems may require using Setup (F10) for drive 
configuration.  

 

The IDE controller is configured as a PCI device with bus mastering capability. The PCI 
configuration registers for the IDE controller function (PCI device #31, function #1) are listed in 
Table 5-1.  
Table 5–1.   IDE PCI Configuration Registers 
 

Table 5-1. 

EIDE PCI Configuration Registers (82801, Device 31/Function 1) 

 

 

00-01h Vender 

ID 

8086h 

0F..1Fh 

Reserved 

0’s 

02-03h 

Device ID 

244Bh 

20-23h 

BMIDE Base Address 

1 

04-05h 

PCI Command 

0000h 

2C, 2Dh 

Subsystem Vender ID 

0000h 

06-07h 

PCI Status 

0280h 

2E, 2Fh 

Subsystem ID 

0000h 

08h Revision 

ID 

00h 

30..3Fh 

Reserved 

0’s 

09h 

Programming 

80h 

40-43h 

Pri./Sec. IDE Timing 

0’s 

0Ah 

Sub-Class 

01h 

44h 

Slave IDE Timing 

00h 

0Bh 

Base Class Code 

01h 

48h 

Sync. DMA Control 

00h 

0Dh 

Master Latency Timer 

00h 

4A-4Bh 

Sync. DMA Timing 

0000h 

0Eh 

Header Type 

00h 

54h 

EIDE I/O Config.Register 

00h 

NOTE: 

Assume unmarked gaps are reserved and/or not used.

 

 

 
The IDE interface can perform PCI bus master operations using the registers listed in Table 5-2. 
These registers occupy 16 bytes of variable I/O space set by software and indicated by PCI 
configuration register 20h in the previous table.  
Table 5–2.   IDE Bus Master Control Registers 
 

 

 

 

      

IDE Bus Master Control Registers 

00h 

1 

Bus Master IDE Command (Primary)  

00h 

02h 

1 

Bus Master IDE Status (Primary) 

00h 

04h 

4 

Bus Master IDE Descriptor Pointer (Pri.) 

0000 0000h 

08h 

1 

Bus Master IDE Command (Secondary)  

00h 

0Ah 

2 

Bus Master IDE Status (Secondary) 

00h 

0Ch 

4 

Bus Master IDE Descriptor Pointer (Sec.) 

0000 0000h 

NOTE: 
 

Unspecified gaps are reserved, will return indeterminate data, and should not be written to.  

5-2   Compaq Evo and Workstation Personal Computers 
          Featuring the Intel Pentium 4 Processor