AMD-766AC AMD [Advanced Micro Devices], AMD-766AC Datasheet - Page 78

• Manufacturer Part Number: AMD-766AC
• Description: Peripheral Bus Controller
• Manufacturer: AMD [Advanced Micro Devices]

23167B – March 2001
PM48: TCO Control 1 Register
IO mapped (base pointer: C3A58); offset: 49-48h. Default: 0000h. Read-write.
15
Reserved
7
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
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
Reserved
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
14
Reserved
6
Reserved
6
Reserved
64 milliseconds
Clock period
256 seconds
16 seconds
1 second
13
Reserved
5
Reserved
5
Reserved
12
Reserved
4
Reserved
4
Reserved
17:16
CLKSRC
Maximum time (clock period times 255)
16.32 seconds
255 seconds = 4.25 minutes
68 minutes = 1.13 hours
1088 minutes = 18.13 hours
Preliminary Information
11
TCOHALT
3
Reserved
3
Reserved
15:8
CURCOUNT
AMD-766
10
MBL
2
Reserved
2:1
INTRDR_SEL
TM
Peripheral Bus Controller Data Sheet
Reserved
9
NMI2SMI_EN
1
7:0
RELOAD
8
NMI_NOW
0
Reserved
0
Reserved
78