AMD-766AC datasheet(78/96 Pages) AMD

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Preliminary Information

23167B – March 2001

AMD-766

TM Peripheral Bus Controller Data Sheet

PM48: TCO Control 1 Register

IO mapped (base pointer: C3A58); offset: 49-48h. Default: 0000h. Read-write.

Reserved

TCOHALT

MBL

NMI2SMI_EN

NMI_NOW

765

43210

Reserved

NMI_NOW. Generate NMI. 1=Assert NMI. It is expected that the NMI interrupt handler clears this bit.

NMI2SMI_EN. NMI interrupts generate SMI interrupts. 1=Whenever an NMI is detected, PM44[NMI2SMI_STS]

is set and the NMI pin is not asserted; this bit does not affect NMI_NOW (setting NMI_NOW generates an NMI

interrupt regardless of the state of NMI2SMI_EN). Note: If this bit is set and RTC70[NMIDIS] is set, then neither

NMI nor SMI# is asserted when NMI events occur.

MBL. Must be low. Read-write. This bit is required to be low at all times; otherwise undefined behavior will result.

TCOHALT. TCO timer halt. 1=Freeze TCO timer in its current state; PM44[TOUT_STS] and

PM46[2NDTO_STS] may not be set.

PM4A: TCO Control 2 Register

IO mapped (base pointer: C3A58); offset: 4Ah. Default: 00h. Read-write.

765

432:1

Reserved

INTRDR_SEL

Reserved

INTRDR_SEL. Select action taken if PM46[INTRDR_STS] is set. 00b=Reserved; 01b=IRQ (as specified by

C3A44[TCO_INT_SEL]); 10b=SMI; 11b=Reserved.

PM98: System Inactivity Timer Register

IO mapped (base pointer: C3A58); offset: 9B-98h. Default: 0000_0000h.

31:18

17:16

15:8

7:0

Reserved

CLKSRC

CURCOUNT

RELOAD

RELOAD. System inactivity timer reload value. Read-write. Writes to this field cause the system inactivity timer

to be reloaded with the value written. System inactivity timer reload events enabled by PMB0 and PMB4 reload this

value into the timer.

CURCOUNT. Read only. System inactivity timer current count value.

CLKSRC. System inactivity timer clock source. Read-write. Specifies the clock to the system inactivity timer per

the following table.

CLKSRC

Clock period

Maximum time (clock period times 255)

00b

64 milliseconds

16.32 seconds

01b

1 second

255 seconds = 4.25 minutes

10b

16 seconds

68 minutes = 1.13 hours

11b

256 seconds

1088 minutes = 18.13 hours

AMD-766AC Datasheet(PDF) 78 Page - Advanced Micro Devices

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