DESCRIPTION OF PIN FUNCTIONS
PIN
No./
QFP
BUFFER
TYPE
PER
BUFFER
TYPE
NAME
TOTAL
SYMBOL
NOTES
FUNCTION
(NOTE 1)
PROCESSOR/HOST LPC INTERFACE (10)
23:20 Multiplexed Command,
Address, Data [3:0]
4
LAD[3:0]
PCI_IO
PCI_IO
24
25
26
Frame
Encoded DMA Request
PCI Reset
1
1
1
nLFRAME
nLDRQ
nPCI_RESE
T
PCI_I
PCI_O
PCI_I
PCI_I
PCI_O
PCI_I
27
29
Power Down
PCI Clock
1
1
nLPCPD
PCI_CLK
PCI_I
PCI_ICL
K
PCI_I
PCI_ICLK
2
30
Serial IRQ
1
SER_IRQ
CLOCKS (2)
CLOCKI32
PCI_IO
PCI_IO
6
32.768 Trickle Clock
Input
14.318MHz Clock Input
1
1
IS
IS
IS
IS
3
19
CLOCKI
FAN CONTROL (4)
51
52
54
55
General Purpose I/O
/Fan Tachometer 2
General Purpose I/O
/Fan Tachometer 1
General Purpose I/O
/Fan Speed Control 2
General Purpose I/O
/Fan Speed Control 1
1
1
1
1
GP30/
FAN_TACH2
IO8
(I/O8/OD8)/I
(I/O8/OD8)/I
GP31/
FAN_TACH1
IO8
GP32/FAN2
GP33/FAN1
IO12
IO12
(I/O12/OD12)/
(O12/OD12)
4
(I/O12/OD12)/
(O12/OD12)
4
INFRARED INTERFACE (2)
61
62
Infrared Rx
/General Purpose I/O
Infrared Tx
1
IRRX2/GP34 IS/O8
IS/(IS/O8/OD8)
1
IRTX2/GP35 IO12
O12/(I/O12/
OD12)
5,6
/General Purpose I/O
POWER PINS (10)
53,
65,93
7, 31, Ground
60,76
Power
3
4
VCC
VSS
40
44
18
Analog Ground
Reference Voltage
Trickle Voltage
1
1
1
AVSS
VREF
VTR
7
FDD INTERFACE (14)
16
11
10
12
8
9
4
5
Read Disk Data
Write Gate
Write Disk Data
Head Select
Step Direction
Step Pulse
1
nRDATA
nWGATE
nWDATA
nHDSEL
nDIR
nSTEP
nDSKCHG
nDS0
IS
IS
1
1
1
1
1
1
1
O12
O12
O12
O12
O12
IS
(O12/OD12)
(O12/OD12)
(O12/OD12)
(O12/OD12)
(O12/OD12)
IS
Disk Change
Drive Select 0
O12
(O12/OD12)
Page 6
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