
26
Signal Descriptions
Chapter 2
AMD-8111 HyperTransport I/O Hub Data Sheet
24674
Rev. 3.00
April 2003
AMD Preliminary Information
LID.
Lid change-state detect input. This may be used to
detect state changes in notebook shell lids. 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 GPIO18 by PMD2.
PCISTOP_L.
PCI bus clock stop. This may be used to
control the system clock chip to control the PCI bus clock
signals. It is controlled by DevB:3x50[PSTP]. It may also be
used in association with CLKRUN_L; see Section 3.7.1.5 on
page 56 for more details.
PME_L.
Power management interrupt. This pin may be used
to generate SMI or SCI interrupts and resume events. It
controls PM20[PME_STS].
PNPIRQ[2:0].
Plug and play interrupt request inputs. These
may be assigned to control any of 12 of the internal IRQ
signals by DevB:3x44. PNPIRQ0 may be configured as
GPIO19 by PMD3; PNPIRQ1 may be configured as GPIO20
by PMD4; PNPIRQ2 may be configured as GPIO21 by
PMD5.
PRDY.
Processor ready. When this is asserted, the IC
freezes the timers specified by DevB:3x4C.
PWRBTN_L.
Power button. This may be used to control the
automatic transition from a sleep state to FON. It controls
PM00[PWRBTN_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.
I, IO
VDD_
IOX
O
VDD_
IO
High
High
Func.
I
VDD_
IOX
I,
IO,
VDD_
IO
Input
Input
Input
I
VDD_
IO
VDD_
IOX
I
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