82801DB Datasheet, PDF (422/587 Pages) Intel Corporation – Intel 82801DB I/O Controller Hub 4 (ICH4)

EHCI Controller Registers (D29:F7)
12.1.10
MEM_BASE—Memory Base Address Register
(USB EHCI—D29:F7)
Address Offset: 10–13h
Default Value: 00000000h
Attribute: R/W, RO
Size:
32 bits
Bit
Description
31:10
9:4
3
2:1
0
Base Address — R/W. Bits [31:10] correspond to memory address signals [31:10], respectively.
This provides 1 KB of locatable memory space aligned to 1 KB boundaries.
Reserved
Prefetchable — RO. Hardwired to 0; indicates that this range should not be prefetched.
Type — RO. Hardwired to 00b; indicates that this range can be mapped anywhere within 32-bit
address space.
Resource Type Indicator (RTE) — RO. Hardwired to 0; indicates that the base address field in this
register maps to memory space.
12.1.11
SVID—USB EHCI Subsystem Vendor ID Register
(USB EHCI—D29:F7)
Address Offset:
Default Value:
Reset:
2C–2Dh
XXXXh
None
Attribute: R/W-Special
Size:
16 bits
Bit
Description
Subsystem Vendor ID (SVID) — R/W-Special. This register, in combination with the USB EHCI
15:0 ^{Subsystem ID register, enables the operating system to distinguish each subsystem from the others.}
NOTE: Writes to this register are enabled when the WRT_RDONLY bit (offset 80h, bit 0) is set to 1.
12.1.12
SID—USB EHCI Subsystem ID Register
(USB EHCI—D29:F7)
Address Offset:
Default Value:
Reset:
2E–2Fh
XXXXh
None
Attribute: R/W-Special
Size:
16 bits
Bit
Description
Subsystem ID (SID) — R/W-Special. BIOS sets the value in this register to identify the Subsystem
ID. This register, in combination with the Subsystem Vendor ID register, enables the operating
15:0 _{system to distinguish each subsystem from other(s).}
NOTE: Writes to this register are enabled when the WRT_RDONLY bit (offset 80h, bit 0) is set to 1.
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Intel^® 82801DB ICH4 Datasheet