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Signal Descriptions
Chapter 2
AMD-8111 HyperTransport I/O Hub Data Sheet
24674
Rev. 3.00
April 2003
AMD Preliminary Information
SLPBTN_L.
Sleep button input. This may be used to control
the automatic transition from a sleep state to FON. It controls
PM00[SLPBTN_STS]. 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_L pin to be driven High and
PM00[PBOR_STS] to be set High. The logic for this pin
includes a debounce circuit. When the signal is asserted
High or Low for less than 12 milliseconds, the debounce
logic does not propagate a change of the signal value to the
internal logic; the signal must be asserted for at least 16
milliseconds to be safely detected by the internal logic. This
pin may be configured as GPIO23 by PMD7.
SMBALERT0_L.
SMBus 1.0 alert input. This may be used to
generate an SMI or SCI interrupt or a resume event
associated with the SMBus logic. This pin may be configured
as GPIO22 by PMD6. Note: although this pin resides on the
VDD_IOX power plane, it can only be used for the SMBus
alert function while the main power supply is valid.
SMBALERT1_L.
SMBus 2.0 alert input. This may be used to
generate an SMI or SCI interrupt or a resume event
associated with the SMBus logic. This pin may be configured
as GPIO24 by PMD8.
SMBUSC[1:0].
System management bus (SMBus) clock.
SMBUSC[0] is associated with the SMBus 1.0 host controller
and SMBUSC[1] is associated with the SMBus 2.0 host
controller. The logic for the SMBUSC1 pin includes a
debounce circuit. When the signal is asserted High or Low
for less than 80 nanoseconds, the debounce logic does not
propagate a change of the signal value to the internal logic;
the signal must be asserted for at least 100 nanoseconds to
be safely detected by the internal logic.
SMBUSD[1:0].
System management bus (SMBus) data.
SMBUSD[0] is associated with the SMBus 1.0 host controller
and SMBUSD[1] is associated with the SMBus 2.0 host
controller. The logic for the SMBUSD1 pin includes a
debounce circuit. When the signal is asserted High or Low
for less than 80 nanoseconds, the debounce logic does not
propagate a change of the signal value to the internal logic;
the signal must be asserted for at least 100 nanoseconds to
be safely detected by the internal logic.
I,
IO
VDD_
IOX
I, IO
VDD_
IOX
I, IO
VDD_
IOX
IOD
VDD_
IOX
3-State 3-State Func.
Func.
IOD
VDD_
IOX
3-State 3-State Func.
Func.
Table 6.
System Management Pin Descriptions (Continued)
Pin Name and Description
I/O
Cell
Type
Power
Plane
During
Reset
After
Reset
During
POS
During
S3:S5