82801DB Datasheet, PDF (257/587 Pages) Intel Corporation – Intel 82801DB I/O Controller Hub 4 (ICH4)

LAN Controller Registers (B1:D8:F0)
7.1.12
CSR_IO_BASE — CSR I/O-Mapped Base Address Register
(LAN Controller—B1:D8:F0)
Offset Address: 14–17h
Default Value: 0000 0001h
Attribute:
Size:
R/W, RO
32 bits
Note: The ICH4’s integrated LAN controller requires one BAR for memory mapping. Software
determines which BAR (memory or I/O) is used to access the Lan controller’s CSR registers.
Bit
Description
31:16 Reserved
15:6
Base Address — R/W. Provides 64 bytes of I/O-Mapped address space for the LAN controller’s
Control/Status Registers.
5:1 Reserved
0 I/O Space Indicator — RO. Hardwired to 1 to indicate that this base address maps to I/O space.
7.1.13
SVID — Subsystem Vendor ID (LAN Controller—B1:D8:F0)
Offset Address: 2C–2D
Default Value: 0000h
Attribute:
Size:
RO
16 bits
Bit
Description
15:0 Subsystem Vendor ID (SVID) — RO. (see Section 7.1.14 for details)
7.1.14
SID — Subsystem ID (LAN Controller—B1:D8:F0)
Offset Address: 2E–2Fh
Default Value: 0000h
Attribute:
Size:
RO
16 bits
Bit
15:0 Subsystem ID (SID) — RO.
Description
Note:
The ICH4’s integrated LAN controller provides support for configurable Subsystem ID and
Subsystem Vendor ID fields. After reset, the LAN controller automatically reads addresses Ah
through Ch, and 23h of the EEPROM. The LAN controller checks bits 15:13 in the EEPROM word
Ah, and functions according to Table 7-2.
Table 7-2. Configuration of Subsystem ID and Subsystem Vendor ID via EEPROM
Bits 15:14
11b, 10b,
00b
01b
01b
Bit 13 Device ID Vendor ID
X
103Ah
8086h
0b Word 23h 8086h
1b Word 23h Word Ch
Revision ID
Note 1
Note 1
REVID + Word Ah, bits
10:8
Subsystem ID
0000h
Word Bh
Word Bh
Subsystem
Vendor ID
0000h
Word Ch
Word Ch
NOTE:
1. Refer to the ICH4 specification update for the value of the Revision ID Register.
2. The Device ID is loaded from Word 23h only if the value of Word 23h is not 0000h or FFFFh
Intel^® 82801DB ICH4 Datasheet
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