AMD-766 Datasheet, PDF (78/96 Pages) Advanced Micro Devices – Peripheral Bus Controller

23167B – March 2001
Preliminary Information
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.
15
Reserved
14
Reserved
13
Reserved
12
Reserved
11
TCOHALT
10
MBL
9
8
NMI2SMI_EN NMI_NOW
7
Reserved
6
Reserved
5
Reserved
4
Reserved
3
Reserved
2
Reserved
1
Reserved
0
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.
7
6
5
4
3
2:1
0
Reserved Reserved Reserved Reserved 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
00b
01b
10b
11b
Clock period
64 milliseconds
1 second
16 seconds
256 seconds
Maximum time (clock period times 255)
16.32 seconds
255 seconds = 4.25 minutes
68 minutes = 1.13 hours
1088 minutes = 18.13 hours
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