82443GX Datasheet, PDF (105/128 Pages) Intel Corporation – Intel 440GX AGPset: 82443GX Host Bridge/Controller

Functional Description
Desktop Power Management Functions
In general, all functions of the 82443GX are available in the desktop configuration. Due to system
design limitations, however, certain functions are not supported in a desktop environment (i.e.,
POS/C3 state).
System Power Modes
Table 4-12 provides an overview of how the above features map into system-wide low power
modes.
Table 4-12. Low Power Mode
System Suspend State
82443GX
State
Description
POS Exit
PCIRST
External Clk
HCLK PCLK
Powered-On
The 82443GX is fully on and
operating normally.
ON
N/A
Internal clock gating as well as PCI
CLKRUN# may be enabled.
CPU STOP_GRANT /
QUICK_START
(C2)
This is transparent to the 82443GX
as external HCLK and PCLK are
ON ^{unaffected. Host Bus is Idle however.}
N/A
Internal clock gating as well as PCI
CLKRUN# may be enabled.
CPU STOP CLOCK (C3)
HCLK clock is kept low. The
POS 82443GX maintains DRAM refresh
N
(DEEP SLEEP)
using suspend refresh.
Powered On Suspend
(POS, POSCL)
The only running clock is the RTC
clock. The 82443GX maintains
POS DRAM refresh using suspend
N
refresh. When resume, the 82443GX
may or may not generate CPU reset.
Powered On Suspend
(POSCL)
The only running clock is the RTC
clock. The 82443GX maintains
DRAM refresh using suspend
Y
refresh. On resume, PIIX4E
generates PCI reset.
Suspend to RAM
(STR)
CPU and other components (with the
exception of DRAM and PIIX4E
resume logic) are assumed to be
powered OFF.
POS
Y
The 82443GX maintains DRAM
refresh using suspend refresh. All
82443GX logic, with the exception of
resume and refresh are inactive.
Entire system is powered OFF except
Suspend -to-Disk (STD)
or Powered-Off
OFF
for PIIX4E resume and RTC wells.
Upon resume, the 82443GX resets
N/A
its entire state.
HCLK PCLK
Active Active
Active Active
Low
Low or
Active
Low
Low
Low
Low
Low
Low
X
X
82443GX Host Bridge Datasheet
4-25