82801FB Datasheet, PDF (444/786 Pages) Intel Corporation – Intel I/O Controller Hub 6 (ICH6) Family

IDE Controller Registers (D31:F1)
11.1.15
BM_BASE — Bus Master Base Address Register
(IDE—D31:F1)
Address Offset: 20h–23h
Default Value: 00000001h
Attribute: R/W, RO
Size:
32 bits
The Bus Master IDE interface function uses Base Address register 5 to request a 16-byte I/O space
to provide a software interface to the Bus Master functions. Only 12 bytes are actually used
(6 bytes for primary, 6 bytes for secondary). Only bits [15:4] are used to decode the address.
Bit
Description
31:16
15:4
3:1
Reserved
Base Address — R/W. This field provides the base address of the I/O space (16 consecutive I/O
locations).
Reserved
0 Resource Type Indicator (RTE) — RO. Hardwired to 1 indicating a request for I/O space.
11.1.16
IDE_SVID — Subsystem Vendor Identification
(IDE—D31:F1)
Address Offset:
Default Value:
Lockable:
2Ch–2Dh
00h
No
Attribute: R/WO
Size:
16 bits
Power Well: Core
Bit
Description
Subsystem Vendor ID (SVID) — R/WO. The SVID register, in combination with the Subsystem ID
(SID) register, enables the operating system (OS) to distinguish subsystems from each other.
15:0 Software (BIOS) sets the value in this register. After that, the value can be read, but subsequent
writes to this register have no effect. The value written to this register will also be readable via the
corresponding SVID registers for the USB#1, USB#2, and SMBus functions.
11.1.17
IDE_SID — Subsystem Identification Register
(IDE—D31:F1)
Address Offset:
Default Value:
Lockable:
2Eh–2Fh
0000h
No
Attribute: R/WO
Size:
16 bits
Power Well: Core
Bit
Description
Subsystem ID (SID) — R/WO. The SID register, in combination with the SVID register, enables the
operating system (OS) to distinguish subsystems from each other. Software (BIOS) sets the value in
15:0 this register. After that, the value can be read, but subsequent writes to this register have no effect.
The value written to this register will also be readable via the corresponding SID registers for the
USB#1, USB#2, and SMBus functions.
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Intel^® I/O Controller Hub 6 (ICH6) Family Datasheet