Compaq iPAQ 1.0 Technical Reference Manual page 84

Chapter 5 Input/Output Interfaces
5.2.1.1 IDE Configuration Registers
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
EIDE PCI Configuration Registers (82801, Device 31/Function 1)
PCI Conf.
Addr. Register
00-01h Vender ID
02-03h Device ID
04-05h PCI Command
06-07h PCI Status
08h Revision ID
09h Programming
0Ah Sub-Class
0Bh Base Class Code
0Dh Master Latency Timer
0Eh Header Type
0F-1Fh Reserved
20-23h BMIDE Base Address
NOTE:
Assume unmarked gaps are reserved and/or not used.
[1] 82801AA ICH = 2411h, 82801BA ICH2 = 244Bh
5.2.1.2 IDE Bus Master Control Registers
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
I/O Addr. Size
Offset (Bytes)
00h 1
02h 1
04h 4
08h 1
0Ah 2
0Ch 4
NOTE:
Unspecified gaps are reserved, will return indeterminate data, and should not be written to.
5-2 Compaq iPAQ Series of Desktop Personal Computers
Table 5-1.
Table 5-2.
IDE Bus Master Control Registers
Register
Bus Master IDE Command (Primary)
Bus Master IDE Status (Primary)
Bus Master IDE Descriptor Pointer (Pri.)
Bus Master IDE Command (Secondary)
Bus Master IDE Status (Secondary)
Bus Master IDE Descriptor Pointer (Sec.)
Second Edition – February 2001
Reset PCI Conf.
Value Addr. Register
8086h 24-2Bh Reserved
[1] 2C, 2Dh Subsystem Vender ID
0000h 2E, 2Fh Subsystem ID
0280h 30-3Fh Reserved
00h 40-43h Primary IDE Timing
80h 44h Secondary IDE Timing
01h 48h Sync. DMA Control
01h 4A-4Bh Sync. DMA Timing
0000h 54h EIDE I/O Config.Register
80h F8-FBh Manufacturer's ID
00h FC-FFh Reserved
1h -- --
Default
Value
00h
00h
0000 0000h
00h
00h
0000 0000h
Reset
Value
0's
8086h
2411h
0's
0000h
00h
00h
0000h
00h
--