DESCRIPTION OF PIN FUNCTIONS
PIN
No./QFP
12
BUFFER
TYPE
O24/OD24
NAME
TOTAL
SYMBOL
nHDSEL
nDIR
Head Select
Step Direction
Step Pulse
1
1
1
1
1
1
1
1
1
1
1
1
1
8
9
O24/OD24
O24/OD24
IS
nSTEP
17
5
Disk Change
Drive Select 0
Drive Select 1
Motor On 0
nDSKCHG
nDS0
O24/OD24
O24/OD24
O24/OD24
O24/OD24
IS
4
nDS1
3
nMTR0
6
Motor On 1
nMTR1
15
14
13
1
Write Protected
Track 0
nWRTPRT
nTRKO
IS
Index Pulse Input
nINDEX
DRVDEN0
DRVDEN1
IS
Drive Density Select 0
Drive Density Select 1
O24/OD24
O24/OD24
2
SERIAL PORT 1 INTERFACE (8)
84
85
87
Receive Serial Data 1
1
1
1
RXD1
TXD1
I
Transmit Serial Data 1
Request to Send 1
O4
O4/I
nRTS1/
SYSOP
88
89
86
91
90
Clear to Send 1
1
1
1
1
1
nCTS1
nDTR1
nDSR1
nDCD1
nRI1
I
Data Terminal Ready 1
Data Set Ready 1
Data Carrier Detect 1
Ring Indicator 1
O4
I
I
I
SERIAL PORT 2 INTERFACE (8)
95
96
Receive Serial Data 2/Infrared Rx
1
1
1
1
1
RXD2/IRRX
TXD2/IRTX
nRTS2/SA12
nCTS2/SA13
I
Transmit Serial Data 2/Infrared Tx
Request to Send 2/Sys Addr 12
Clear to Send 2/Sys Addr 13
O24
O4/I
I/I
98
99
100
Data Terminal Ready/Sys Addr 14
nDTR2/
SA14
O4/I
97
Data Set Ready 2/Sys Addr 15
1
nDSR2/
SA15
I/I
94
92
Data Carrier Detect 2/8042 P12
Ring Indicator 2/8042 P16
1
1
nDCD2/P12
nRI2/P16
I/IO24
I/IO24
7
SMSC [ SMSC CORPORATION ]
