
Enhanced Super I/O Controller with Fast IR
Datasheet
SMSC FDC37C672
Page 13
Rev. 10-29-03
PRELIMINARY DATASHEET
PIN NO.
QFP/TQFP
NAME
TOTAL
SYMBOL
BUFFER
TYPE
12 /10
Head Select
1
nHDSEL
O24/OD24
8 / 6
Step Direction
1
nDIR
O24/OD24
9 / 7
Step Pulse
1
nSTEP
O24/OD24
17 / 15
Disk Change
1
nDSKCHG
IS
5 / 3
Drive Select 0
1
nDS0
O24/OD24
4 / 2
Drive Select 1
1
nDS1
O24/OD24
3 / 1
Motor On 0
1
nMTR0
O24/OD24
6 / 4
Motor On 1
1
nMTR1
O24/OD24
15 / 13
Write Protected
1
nWRTPRT
IS
14 / 12
Track 0
1
nTRKO
IS
13 / 11
Index Pulse Input
1
nINDEX
IS
1 / 99
Drive Density Select 0
1
DRVDEN0
O24/OD24
2 / 100
Drive Density Select 1/IR Mode Select/IRRX3
1
DRVDEN1/
IRMODE/
IRRX3
O24/OD24/O
24/I
SERIAL PORT 1 INTERFACE (8)
84 / 82
Receive Serial Data 1
1
RXD1
I
85 / 83
Transmit Serial Data 1
1
TXD1
O4
87 / 85
Request to Send 1
1
nRTS1/ SYSOP
O4/I
88 / 86
Clear to Send 1
1
nCTS1
I
89 / 87
Data Terminal Ready 1
1
nDTR1
O4
86 / 84
Data Set Ready 1
1
nDSR1
I
91 / 89
Data Carrier Detect 1
1
nDCD1
I
90 / 88
Ring Indicator 1
1
nRI1
I
SERIAL PORT 2 INTERFACE (8)
95 / 93
Receive Serial Data 2/Infrared Rx
1
RXD2/IRRX
I
96 / 94
Transmit Serial Data 2/Infrared Tx
1
TXD2/IRTX
O24
98 / 96
Request to Send 2/Sys Addr 12/ Parallel IRQ_5
1
nRTS2/SA12/IR
Q5
O4/I/O24/
OD24
(Note 3.1)
99 / 97
Clear to Send 2/Sys Addr 13/ Parallel IRQ_6
1
nCTS2/SA13/IR
Q6
I/I/O24/ OD24
(Note 3.1)
100 / 98
Data Terminal Ready/Sys Addr 14/ Parallel IRQ_7
1
nDTR2/SA14/I
RQ7
O4/I/O24/
OD24
(Note 3.1)
97 / 95
Data Set Ready 2/Sys Addr 15/ Parallel
IRQ_10/nSMI
1
nDSR2/SA15/I
RQ10/
nSMI
I/I/O24/OD 24
(Note 3.1)
94 / 92
Data Carrier Detect 2/8042 P12/ Parallel IRQ_11
1
nDCD2/P12/
IRQ11
I/IO24/O24/O
D24
(Note 3.1)
92 / 90
Ring Indicator 2/8042 P16/Parallel IRQ_12
1
nRI2/P16/
IRQ12
I/IO24/O24/O
D24
(Note 3.1)
PARALLEL PORT INTERFACE (17)
68:75 /
66:73
Parallel Port Data Bus
8
PD[0:7]
IO24