307013-003 Datasheet, PDF (607/848 Pages) Intel Corporation – Intel I/O Controller Hub 7

IDE Controller Registers (D31:F1)
15.1.15 BM_BASE — Bus Master Base Address Register
(IDE—D31:F1)
Address Offset: 20h–23h
Default Value: 00000001h
Attribute:
Size:
R/W, RO
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 Reserved
15:4
3:1
0
Base Address — R/W. This field provides the base address of the I/O space (16
consecutive I/O locations).
Reserved
Resource Type Indicator (RTE) — RO. Hardwired to 1 indicating a request for I/O space.
15.1.16 IDE_SVID — Subsystem Vendor Identification
(IDE—D31:F1)
Address Offset: 2Ch–2Dh
Default Value: 00h
Lockable:
No
Attribute:
Size:
Power Well:
R/WO
16 bits
Core
Bit
15:0
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. 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.
15.1.17 IDE_SID — Subsystem Identification Register
(IDE—D31:F1)
Address Offset: 2Eh–2Fh
Default Value: 0000h
Lockable:
No
Attribute:
Size:
Power Well:
R/WO
16 bits
Core
Bit
Description
15:0
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 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.
Intel ^® ICH7 Family Datasheet
607