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VT82C586B
Revision 1.0
May 13, 1997
-9-
Pinouts
On Board Plug and Play
Signal Name
MIRQ0 /
APICCS# /
POS (3040F)
Pin No.
90
I/O
I
O
O
Signal Description
Multifunction Pin
(see PCI Configuration Register Function 0 Rx59[3,0])
MIRQ0.
Steerable interrupt request input for on-board devices.
APICCS#
. Chip select for external IOAPIC chip for symmetric multiprocessor
implementations.
POS.
Power-On Suspend Status Output (see Function 0 Rx59 bit-3). This function
was introduced in rev F of the 3040 silicon and is not available in earlier chips.
Rx59[3]
Rx59[0]
Pin Function
0
0
MIRQ0 (input)
0
1
APICCS# (output)
1
0
-illegal-
1
1
POS (output)
Multifunction Pin
(see PCI Configuration Register Function 0 Rx59[1] & Rx48[4])
MIRQ1.
Steerable interrupt request input for on-board devices.
KEYLOCK.
Keyboard lock input.
IRQ8#.
Interrupt input for external RTC. This function was introduced in
revision F of the 3040 silicon and is not available in earlier chips.
Rx48[4]
Rx59[1]
Pin Function
0
0
MIRQ1 (input)
0
1
KEYLOCK (input)
1
0
-illegal-
1
1
IRQ8# (input) (see also Rx5A[2] and table below). With
this setting, Rx57[3:0] must be set to 0 (MIRQ1 routing)
Rx5A[2]
Rx48[4]
Pin Function
0
0
External RTC - IRQ8# input on pin 104
0
1
External RTC - IRQ8# input on pin 106
1
x
Internal RTC - IRQ8# input not required
Multifunction Pin
(see PCI Configuration Register Function 0 Rx59[2] & Rx48[5])
MIRQ2.
Steerable interrupt request input for on-board devices.
MASTER#.
ISA Master Request indicator. This pin also serves as the direction
control for the IDE interface DD / SA transceivers (see SOE#).
SDDIR.
This pin may be programmed to serve as a direction control for the IDE
interface DD / SA transceivers (see SOE#) separate from MASTER#. This
function was introduced in revision A of the 3041 silicon and not available in
earlier chips.
Rx48[5]
Rx59[2]
Pin Function
0
0
MASTER# (input)
0
1
MIRQ2 (input)
1
0
-illegal-
1
1
SDDIR (output)
MIRQ1 /
KEYLOCK /
IRQ8# (3040F)
106
I
I
I
MIRQ2 /
MASTER# /
SDDIR (3041A)
137
I
I
O