82801FB Datasheet, PDF (543/786 Pages) Intel Corporation – Intel I/O Controller Hub 6 (ICH6) Family

EHCI Controller Registers (D29:F7)
14.1.29
ACCESS_CNTL—Access Control Register
(USB EHCI—D29:F7)
Address Offset: 80h
Default Value:
00h
Attribute: R/W
Size:
8 bits
Bit
Description
7:1 Reserved
WRT_RDONLY — R/W. When set to 1, this bit enables a select group of normally read-only
registers in the EHC function to be written by software. Registers that may only be written when this
0
mode is entered are noted in the summary tables and detailed description as “Read/Write-Special”.
The registers fall into two categories:
1. System-configured parameters, and
2. Status bits
14.1.30
USB2IR—USB2 Initialization Register
(USB EHCI—D29:F7)
Address Offset:
Default Value:
FC-FFh
00001706h
Attribute: R/W
Size:
32 bits
Bit
Description
31:8 Reserved
USB EHCI Initialization Field 2 — R/W.
7 Mobile: BIOS must clear this bit to 0b.
Desktop: BIOS must set this bit to 1b.
6 Reserved
5 USB EHCI Initialization Field 1 — R/W. BIOS must clear this bit to 0b.
4:0 Reserved
Intel^® I/O Controller Hub 6 (ICH6) Family Datasheet
543