82801FB Datasheet, PDF (224/786 Pages) Intel Corporation – Intel I/O Controller Hub 6 (ICH6) Family

Functional Description
Table 5-54. Data Values for Slave Read Registers
Register
0
1
1
2
2
3
3
4
4
4
4
4
4
5
5
5
5
6
7
8
9-FFh
Bits
Description
7:0
Reserved
System Power State
000 = S0
001 = S1
010 = Reserved
2:0
011 = S3
100 = S4
101 = S5
110 = Reserved
111 = Reserved
7:3
Reserved
3:0
Frequency Strap Register
7:4
Reserved
5:0
Watchdog Timer current value
7:6
Reserved
0
1 = The Intruder Detect (INTRD_DET) bit is set. This indicates that the
system cover has probably been opened.
1
1 = BTI Temperature Event occurred. This bit will be set if the Intel^® ICH6’s
THRM# input signal is active. Need to take after polarity control.
2
Boot-status. This bit will be 1 when the processor does not fetch the first
instruction.
3
This bit will be set after the TCO timer times out a second time (Both
TIMEOUT and SECOND_TO_STS bits set).
6:4
Reserved
The bit will reflect the state of the GPI11/SMBALERT# signal, and will depend
on the GP_INV11 bit. It does not matter if the pin is configured as GPI11 or
SMBALERT#.
7
• If the GP_INV11 bit is 1, the value of register 4 bit 7 will equal the level of
the GPI11/SMBALERT# pin (high = 1, low = 0).
• If the GP_INV11 bit is 0, the value of register 4 bit 7 will equal the inverse
of the level of the GPI11/SMBALERT# pin (high = 1, low = 0).
0
Unprogrammed flash BIOS bit. This bit will be 1 to indicate that the first BIOS
fetch returned FFh, that indicates that the flash BIOS is probably blank.
1
Reserved
2
Processor Power Failure Status. 1 if the CPUPWR_FLR bit in the
GEN_PMCON_2 register is set.
7:3
Reserved
7:0
Contents of the Message 1 register.
7:0
Contents of the Message 2 register.
7:0
Contents of the WDSTATUS register.
7:0
Reserved
224
Intel^® I/O Controller Hub 6 (ICH6) Family Datasheet