Intel 6300ESB Datasheet page 611

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15—Intel 6300ESB ICH
Table 533. Timer n Config and Capabilities (Sheet 2 of 3)
Timer 0: 100-107h,
Offset: Timer 1: 120-127h,
Timer 2: 140-147h
N/A
Default Value:
Bits Name
13:9 TIMERn_INT_ROUT_CNF
8 TIMERn_32MODE_CNF
7 Reserved
6 TIMERn_VAL_SET_CNF
5 TIMERn_SIZE_CAP
4 TIMERn_PER_INT_CAP
November 2007
Order Number: 300641-004US
Attribute:
Description
Interrupt Rout: This 5-bit field indicates the routing for the
interrupt to the I/O (x) APIC. A maximum value of 32
interrupts is supported; default is 00h. Software writes to this
field to select which interrupt in the I/O (x) will be used for
this timer's interrupt. When the value is not supported by this
particular timer, the value read back will not match what is
written. The software must only write valid values.
NOTES:
1. When the Legacy Rout bit is set, Timers 0 and 1 will have
a different routing, and this bit field has no effect for those
two timers.
2. Timer 0,1 Specific: Software is responsible to make sure it
programs a valid value (20, 21, 22, or 23) for this field.
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The Intel 6300ESB ICH logic does not check the validity
of the value written.
3. Timer 2 Specific: Software is responsible to make sure it
programs a valid value (11, 20, 21, 22, or 23) for this
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field. The Intel 6300ESB ICH logic does not check the
validity of the value written.
Timer n 32-bit Mode: Software may set this bit to force a 64-
bit timer to behave as a 32-bit timer. For Timer 0, this bit will
be read/write and default to '0'. For Timers 1 and 2, this bit
will always read as '0', and writes will have no effect, since
these two timers are 32 bits.
Reserved. This bit will return '0' when read.
Timer n Value Set: Software uses this bit only for Timer 0
when it has been set to periodic mode. By writing this bit to a
'1', the software is then allowed to directly set the timer's
accumulator. Software does NOT have to write this bit back to
'0'; it automatically clears.
Software should not write a '1' to this bit position when the
timer is set to non-periodic mode.
NOTE: This bit will return '0' when read. Writes will only have
an effect for Timer 0 when it is set to periodic mode.
Writes will have no effect for Timers 1 and 2.
Timer n Size: This read-only field indicates the size of the
timer.
Value is '1' (64 bits) for Timer 0. Value is '0' (32 bits) for
Timers 1 and 2.
Periodic Interrupt Capable: When this read-only bit is '1', the
hardware supports a periodic mode for this timer's interrupt.
Timer 0 will support the periodic interrupt, so the bit will
always read as a '1'. Timers 1 and 2 will not support periodic
interrupts, so the bit will always read as '0'.
Read/Write
64-bit
Size:
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