DESCRIPTION OF PIN FUNCTIONS
PIN
No./QFP
BUFFER
TYPE
NAME
TOTAL
FDD INTERFACE (14)
SYMBOL
16
11
10
12
8
Read Disk Data
Write Gate
1
1
1
1
1
1
1
1
1
1
1
1
1
1
nRDATA
nWGATE
nWDATA
nHDSEL
nDIR
IS
O24/OD24
O24/OD24
O24/OD24
O24/OD24
O24/OD24
IS
Write Disk Data
Head Select
Step Direction
Step Pulse
9
nSTEP
17
5
Disk Change
Drive Select 0
Motor On 0
nDSKCHG
nDS0
O24/OD24
O24/OD24
IS
3
nMTR0
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
RXD2/IRRX
TXD2/IRTX
I
Transmit Serial Data 2/Infrared Tx (Note 4,
Note 7)
O24PD
98
99
Request to Send 2/Sys Addr 12 (Note 6)
Clear to Send 2/Sys Addr 13
1
1
1
nRTS2/SA12
nCTS2/SA13
nDTR2/
O4/I
I/I
100
Data Terminal Ready/Sys Addr 14 (Note 6)
O4/I
SA14
7
SMSC [ SMSC CORPORATION ]
