DESCRIPTION OF PIN FUNCTIONS
PIN
No./QFP
37:40,
42:45
20:30
31
36
55
46
33
NAME
TOTAL
SYMBOL
BUFFER
TYPE
IO24
I
I
I
OD24
IS
IO24/O24/
D24
(Note 0)
IO24/O24/
OD24
(Note 0)
O24
O24
O24/IO24
I
I
I/IO24
I
I
I
ICLK
I
O24
PROCESSOR/HOST INTERFACE (34)
System Data Bus
8
SD[0:7]
11-bit System Address Bus
Chip Select/SA11 (Note 1)
Address Enable
I/O Channel Ready
ISA Reset Drive
Serial IRQ/Parallel IRQ_3
11
1
1
1
1
1
SA[0:10]
nCS/SA11
AEN
IOCHRDY
RESET_DRV
SER_IRQ/
IRQ3
PCI_CLK/
IRQ4
DRQ1
DRQ2
DRQ3/P12
nDACK1
nDACK2
nDACK3/
P16
TC
nIOR
nIOW
CLOCKI
IRRX
IRTX
VCC
32
PCI Clock for Serial IRQ (33MHz/30MHz)/
Parallel IRQ_4
DMA Request 1
DMA Request 2
DMA Request 3/8042 P12
DMA Acknowledge 1
DMA Acknowledge 2
DMA Acknowledge 3/8042 P16
Terminal Count
I/O Read
I/O Write
CLOCKS (1)
1
50
48
52
47
49
51
54
34
35
19
61
62
18,53,
65,93
1
1
1
1
1
1
1
1
1
14.318MHz Clock Input
1
INFRARED INTERFACE (2)
Infrared Rx
1
Infrared Tx
1
POWER PINS (8)
Power
6
SMSC [ SMSC CORPORATION ]
