FW82801EB S L73Z Intel, FW82801EB S L73Z Datasheet - Page 59
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FW82801EB S L73Z
Manufacturer Part Number
FW82801EB S L73Z
Description
Manufacturer
Intel
Datasheet
1.FW82801EB_S_L73Z.pdf
(671 pages)
Specifications of FW82801EB S L73Z
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2.11
Intel
®
Table 13. Power Management Interface Signals
82801EB ICH5 / 82801ER ICH5R Datasheet
Power Management Interface
SYS_RESET#
SUS_STAT# /
VRMPWRGD
THRMTRIP#
LAN_RST#
PWRBTN#
RSMRST#
SLP_S3#
SLP_S4#
SLP_S5#
SUSCLK
PWROK
LPCPD#
THRM#
Name
RI#
Type
O
O
O
O
O
I
I
I
I
I
I
I
I
I
Thermal Alarm: This is an active low signal generated by external hardware to start
the Hardware clock throttling mode. Can also generate an SMI# or an SCI.
Thermal Trip: When low, this signal indicates that a thermal trip from the processor
occurred, and the Intel
not wait for the processor stop grant cycle since the processor has overheated.
S3 Sleep Control: SLP_S3# is for power plane control. This signal shuts off power
to all non-critical systems when in S3 (Suspend To RAM), S4 (Suspend to Disk), or
S5 (Soft Off) states.
S4 Sleep Control: SLP_S4# is for power plane control. This signal shuts power to
all non-critical systems when in the S4 (Suspend to Disk) or S5 (Soft Off) state.
NOTE: This pin must be used to control the DRAM power in order to use the ICH5’s
S5 Sleep Control: SLP_S5# is for power plane control. This signal is used to shut
power off to all non-critical systems when in the S5 (Soft Off) states.
Power OK: When asserted, PWROK is an indication to the ICH5 that core power
and PCICLK have been stable for at least 99 ms. PWROK can be driven
asynchronously. When PWROK is negated, the ICH5 asserts PCIRST#.
NOTE: PWROK must deassert for a minimum of three RTC clock periods in order
Power Button: The Power Button will cause SMI# or SCI to indicate a system
request to go to a sleep state. If the system is already in a sleep state, this signal will
cause a wake event. If PWRBTN# is pressed for more than 4 seconds, this will
cause an unconditional transition (power button override) to the S5 state. Override
will occur even if the system is in the S1-S4 states. This signal has an internal pull-
up resistor.
Ring Indicate: This signal is an input from the modem interface. It can be enabled
as a wake event, and this is preserved across power failures.
System Reset: This pin forces an internal reset after being debounced. The ICH5
will reset immediately if the SMBus is idle; otherwise, it will wait up to 25 ms ± 2 ms
for the SMBus to idle before forcing a reset on the system.
Resume Well Reset: This signal is used for resetting the resume power plane logic.
LAN Reset: This signal must be asserted at least 10 ms after the resume well
power (VccSus3_3) is valid. When deasserted, this signal is an indication that the
resume well power is stable.
Suspend Status: This signal is asserted by the ICH5 to indicate that the system will
be entering a low power state soon. This can be monitored by devices with memory
that need to switch from normal refresh to suspend refresh mode. It can also be
used by other peripherals as an indication that they should isolate their outputs that
may be going to powered-off planes. This signal is called LPCPD# on the LPC I/F.
Suspend Clock: This clock is an output of the RTC generator circuit to use by other
chips for refresh clock.
VRM Power Good: This should be connected to be the processor’s VRM Power
Good.
DRAM power-cycling feature. Refer to
for the ICH5 to fully reset the power and properly generate the PCIRST#
output
®
ICH5 will immediately transition to a S5 state. The ICH5 will
Description
Section 5.13.11.2
Signal Description
for details.
59
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