DESCRIPTION OF PIN FUNCTIONS
BUFFER TYPE
PER
PIN
No./
QFP
BUFFER
TYPE
FUNCTION
(NOTE 1)
NAME
TOTAL
SYMBOL
NOTE
S
14
13
1
Track 0
1
1
1
nTRKO
nINDEX
IS
IS
Index Pulse Input
IS
IS
General Purpose
I/O/Drive Density
Select 0
General Purpose
I/O/Drive Density
Select 1
GP40/
IO12
(I/O12/OD12)/
(O12/OD12)
DRVDEN0
2
1
GP41/
IO12
(I/O12/OD12)/
(O12/OD12)
DRVDEN1
SERIAL PORT 1 INTERFACE (8)
84
85
87
Receive Serial Data 1
Transmit Serial Data 1
Request to Send 1
1
1
1
RXD1
TXD1
IS
O12
O8
IS
O12
O8
12
nRTS1/
SYSOP
88
89
86
91
90
Clear to Send 1
1
1
1
1
1
nCTS1
nDTR1
nDSR1
nDCD1
nRI1
I
I
Data Terminal Ready 1
Data Set Ready 1
Data Carrier Detect 1
Ring Indicator 1
O6
O6
I
I
I
I
I
I
SERIAL PORT 2 INTERFACE (8)
95
96
98
General Purpose I/O
/Receive Serial Data 2
/IRQ5
General Purpose I/O
/Transmit Serial Data 2
/IRQ7
General Purpose I/O
/Request to Send
2/IRQ10
1
1
1
GP52/RXD2/ IS/O8
IRQ5
(IS/O8/OD8)/
IS/IS
GP53/TXD2/ IO12
IRQ7
(I/O12/OD12)/
O12/I
5,6,7
GP55/
nRTS2/
IRQ10
IO8
(I/O8/OD8)/
O8/I
99
General Purpose I/O
/Clear to Send 2/IRQ11
1
1
GP56/nCTS
IO8
IO8
(I/O8/OD8)/I/I
2/IRQ11
100
General Purpose I/O
/Data Terminal
GP57/nDTR
2/IRQ15
(I/O8/OD8)/
O8/I
Ready/IRQ15
97
94
92
General Purpose I/O
/Data Set Ready
2/IRQ9
General Purpose
I/O/Data Carrier Detect
2/IRQ4
General Purpose
I/O/Ring Indicator
2/IRQ3
1
1
1
GP54/nDSR
2/IRQ9
IO8
IO8
IO8
(I/O8/OD8)/I/I
(I/O8/OD8)/I/I
(I/O8/OD8)/I/I
GP51/
nDCD2/
IRQ4
GP50/nRI2/
IRQ3
PARALLEL PORT INTERFACE (17)
66
67
68
69
Initiate Output/FDC
Direction Control
1
1
1
1
nINIT /nDIR
OP14
(OD14/OP14)/
OD14
Printer Select
nSLCTIN
/nSTEP
OP14
(OD14/OP14)/
Input/FDC Step Pulse
OD14
Port Data 0/FDC Index
PD0
IS/OP14
IOP14/IS
IOP14/IS
/nINDEX
Port Data 1/FDC Track
0
PD1 /nTRK0 IS/OP14
SMSC LPC47B27x
- 10 -
Rev. 08-10-04
DATASHEET
SMSC [ SMSC CORPORATION ]
