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Intel
®
82854 Graphics Memory Controller Hub (GMCH)
70 D15343-003
4.8.24 SHIC – Secondary Host Interface Control Register (Device #0)
Address Offset:
Default Value:
Access:
Size:
74-77h
00006010h
Read Only, Read/Write
32 bits
Bit Descriptions
31 Reserved
30 BREQ0# Control of FSB Address and Control bus power management:
0: Disable FSB address and control bus power management.
1: Eisable FSB address and control bus power management.
29:28 Reserved
27 On Die Termination (ODT) Gating Disable:
0: Enable.
1: Disable.
26:7 Reserved
6 FSB Data Bus Power Management Control:
0: FSB Data Bus Power Management disabled (Default).
1: FSB Data Bus Power Management enabled
5 Reserved
4:3 DPWR# Control.
00: DPWR# pin is always asserted.
10: DPWR# pin is asserted at least 2 clocks before read data is returned to the processor on the
FSB (2 clocks before DRDY# asserted). This is default setting.
01: DPWR# is always de-asserted.
11: Reserved
2 C2 state GMCH FSB Interface Power Management Control:
0: Power Management Disabled in C2 state
1: Power Management Enabled in C2 state
1 Reserved.
0 Reserved