AMD-766 Datasheet, PDF (59/96 Pages) Advanced Micro Devices – Peripheral Bus Controller

23167B – March 2001
Preliminary Information
AMD-766^TM Peripheral Bus Controller Data Sheet
C3A41: General Configuration 2 Register
Configuration space; function 3; offset: 41h. Default: 40h.
7
6
5
4
3
2
1
0
PMIOEN TMRRST PCF9EN PBIN
TMR32 NO_REBOOT STPGNT W4SG
W4SG. Wait for stop-grant before deasserting STPCLK#. Read-write. 1=After STPCLK# is asserted for any
reason, it is not deasserted until the corresponding stop-grant cycle is received.
STPGNT. PCI stop-grant cycle specification. Read-write. 0=Stop-grant cycles are detected by the IC as PCI special
cycles in which the address phase AD[4]=1. 1=Stop-grant cycles are detected by the IC as PCI special cycles in
which the data phase AD[31:0]=0012_0002h.
NO_REBOOT. Do not reboot the system when a double TCO timer time out occurs. Read-write. 0=Reboot system
with as specified by PORTCF9[FULLRST] when PM46[2NDTO_STS] is set. 1=Do not reboot the system.
TMR32. ACPI timer size selection. Read-write. 0=The ACPI timer, PM08, is 24 bits. 1=The ACPI timer is 32
bits.
PBIN. Power button in. Read only. This bit reflects the current state of the PWRBTN# pin (before the debounce
circuit). 0=PWRBTN# is asserted.
PCF9EN. Port CF9 enable. Read-write. 1=Enable access to PORTCF9.
TMRRST. ACPI timer reset. Read-write. 1=The ACPI timer, PM08, is held in the asynchronously cleared state.
0=The timer is enabled to count.
PMIOEN. System management IO space enable. Read-write. 1=PMxx, The IO space specified by C3A58, is
enabled.
C3A42: SCI Interrupt Configuration
Configuration space; function 3; offset: 42h. Default: 00h. Read-write.
7
6
5
4
3:0
Reserved Reserved TRAPSCI GPIOSCI SCISEL
SCISEL. SCI interrupt selection. This field specifies the IRQ number routed to the interrupt controllers used for
ACPI-defined SCI interrupts. A value of 0h disables SCI interrupts. Values of 2h, 8h, and Dh are reserved. When
C0A4B[SCI2IOA] is high, the value in this register is ignored and SCI does not enter the PIC. All other values are
valid. See section 4.3.4.1 for details about SCI interrupt routing.
GPIOSCI. General purpose IO SCI enable. 1=Enable SCI/SMI (based on the state of PM04[SCI_EN]) interrupts
when status bits in PMD4 are set while enabled by PMD8. This bit has no affect on whether SMI interrupts are
generated via PM2A[GPIOSMI_EN].
TRAPSCI. Trap SCI enable. 1=Enable SCI/SMI (based on the state of PM04[SCI_EN]) interrupts when status bits
in PMA8 are set while enabled by PMAC. This bit has no affect on whether SMI interrupts are generated via
PM2A[TRPSMI_EN].
C3A43: Power State Register
Configuration space; function 3; offset: 43h.
7
6
5:3
VDDA_STS G3TOS5 PWRFL_STS
2:0
PPSTATE
PPSTATE. Previous power state. Read only. This field holds the most previous power state from which the system
entered the FON state. This field resides on the VDD_AUX power plane. This field is encoded as follows:
PPSTATE
0h
1h
2h
Power state
Reserved
POS power on suspend
C2
PPSTATE
4h
5h
6h
Power state
MOFF mechanical off
STR suspend to RAM
STD suspend to disk
3h
C3
7h
SOFF soft off
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