876784 Intel, 876784 Datasheet - Page 465

• Manufacturer Part Number: 876784
• Manufacturer: Intel

Specifications of 876784

• Lead Free Status / RoHS Status: Compliant

LPC Interface Bridge Registers (D31:F0)
10.10.3
10.10.4
Intel
®
ICH7 Family Datasheet
GP_LVL—GPIO Level for Input or Output Register
Offset Address: GPIOBASE +0Ch
Default Value:
Lockable:
GPO_BLINK—GPO Blink Enable Register
Offset Address: GPIOBASE +18h
Default Value:
Lockable:
NOTE: (Desktop Only) GPIO18 will blink by default immediately after reset. This signal could be
31:0
Bit
31:0
Bit
connected to an LED to indicate a failed boot (by programming BIOS to clear GP_BLINK18
after successful POST).
GP_LVL[31:0]— R/W: If GPIO[n] is programmed to be an output (via the
corresponding bit in the GP_IO_SEL register), then the corresponding GP_LVL[n] bit
can be updated by software to drive a high or low value on the output pin. 1 = high,
0 = low.
If GPIO[n] is programmed as an input, then the corresponding GP_LVL bit reflects the
state of the input signal (1 = high, 0 = low.) and writes will have no effect.
When configured in native mode (GPIO_USE_SEL[n] is 0), writes to these bits have
no effect. The value reported in this register is undefined when programmed as
native mode.
GP_BLINK[31:0] — R/W. The setting of this bit has no effect if the corresponding
GPIO signal is programmed as an input.
0 = The corresponding GPIO will function normally.
1 = If the corresponding GPIO is programmed as an output, the output signal will
The value of the corresponding GP_LVL bit remains unchanged during the blink
process, and does not effect the blink in any way. The GP_LVL bit is not altered
when programmed to blink. It will remain at its previous value.
These bits correspond to GPIO in the Resume well. These bits revert to the default
value based on RSMRST# or a write to the CF9h register (but not just on
PLTRST#).
blink at a rate of approximately once per second. The high and low times have
approximately 0.5 seconds each. The GP_LVL bit is not altered when this bit is
set.
02FE0000h
No
00040000h
No
Description
Description
Attribute:
Size:
Power Well:
Attribute:
Size:
Power Well:
R/W
32-bit
Core for 0:7, 16:23,
Resume for 8:15, 24:31
R/W
32-bit
Core for 0:7, 16:23,
Resume for 8:15, 24:31
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