AMD-766 Datasheet, PDF (13/96 Pages) Advanced Micro Devices – Peripheral Bus Controller

23167B – March 2001
Preliminary Information
AMD-766^TM Peripheral Bus Controller Data Sheet
Pin name and description
IO cell Power During Post
type plane Reset Reset
a power button override event is generated. A power button override event
causes the PWRON# pin to be driven high and PM00[PBOR_STS] to be
set high. The logic for this pin includes a 16 millisecond debounce circuit;
the signal must be stable for about 16 milliseconds before it is detected by
the rest of the internal logic.
PWRGD. Power good. This is required to be low while the VDD3 power Input VDD_ -
-
plane is not valid, stay low for at least 50 milliseconds after it becomes
w/H AUX
valid, and then go high. It is the reset source for the VDD3 logic in the IC.
The rising edge of this pin is debounced for one to two 32 kHz (RTC)
clocks before it is internally detected as being high.
PWRON#. Main power on. This is designed to control the main power OD VDD_ Low Low
supplies to the system board, including the IC’s VDD3 plane. It is asserted
AUX
during the FON, C2, C3, and POS states; it is deasserted during the STR,
STD and SOFF states. See section 4.6.1.5 for more details.
RI#. Ring indicate. This pin may be used to generate SMI or SCI
Input, VDD_ -
-
interrupts and resume events. It controls PM20[RI_STS]. This pin may IO AUX
also be configured as GPIO14 by PMCE.
RPWRON. RAM power on. This is designed to control power to the
OD VDD_ High High
system memory power plane. When high, it is expected that power to
AUX
system memory is enabled. When low, it is expected that power to system
memory is disabled. This pin is low during STD and SOFF and high in all
other states. See section 4.6.1.5 for more details.
RTCX_IN. Real time clock 32.768 kHz crystal input. This pin is
Analog VDD_ Func. Func.
designed to be connected through a crystal oscillator to RTCX_OUT.
AL
RTCX_OUT. Real time clock 32.768 kHz crystal output.
Analog VDD_ Func. Func.
AL
SERIRQ. Serial IRQ function. This pin supports the serial IRQ protocol. IO VDD3 -
-
Control for this is in C3A4A.
SLPBTN#. Sleep button. This may be used to control the automatic
Input, VDD_ -
-
transition from a sleep state to FON. It controls PM00[SLPBTN_STS].
IO AUX
Also, if it is asserted for four seconds from any state other than SOFF, then
a power button override event is generated. A power button override event
causes the PWRON# pin to be driven high and PM00[PBOR_STS] to be
set high. The logic for this pin includes a 16 millisecond debounce circuit;
the signal must be stable for about 16 milliseconds before it is detected by
the rest of the internal logic. This pin may also be configured as GPIO3 by
PMC3.
SMBUSC. System management bus (SMBus) clock. This pin may also I w/H / VDD_ 3-state 3-state
be configured as GPIO0 by PMC0.
OD AUX
SMBUSD. System management bus (SMBus) data. This pin may also be I w/H / VDD_ 3-state 3-state
configured as GPIO1 by PMC1.
OD AUX
SUSPEND#. Suspend output. This may be used during the POS state to IO VDD3 High High
control an external power planes. It is controlled by C3A50.
THERM#. Input; thermal warning detect. This may be used to
IO VDD3 -
-
automatically enable processor throttling as specified by C3A50[TTH_EN,
TTH_RATIO]. See section 4.6.1.4 for more details.
POS
-
Low
-
High
Func.
Func.
Func.
-
Func.
Func.
Func.
Func.
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