NOTE1: The Parallel Port Control register reads as “Cable Not Connected” when the Parallel Port FDC
is enabled; i.e., STROBE = AUTOFD = SLC = 0 and nINIT = 1.
Table 47 - FDC Parallel Port Pins
CONNECTOR
QFP
PIN #
1
CHIP PIN #
SPP MODE PIN DIRECTION
FDC MODE
(nDS0)
nINDEX
nTRK0
nWP
PIN DIRECTION
83
68
69
70
71
72
73
74
75
80
79
78
77
82
81
66
67
nSTROBE
PD0
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I
I/(O) Note1
2
I
3
PD1
I
4
PD2
I
5
PD3
nRDATA
nDSKCHG
-
I
6
PD4
I
7
PD5
-
8
PD6
(nMTR0)
-
nDS1
I/(O) Note1
9
PD7
-
10
11
12
13
14
15
16
17
nACK
BUSY
PE
O
O
O
O
O
O
O
O
I
nMTR1
nWDATA
nWGATE
DRVDEN0
nHDSEL
nDIR
I
I
SLCT
nALF
nERROR
nINIT
nSLCTIN
I/O
I
I/O
I/O
nSTEP
Note 1: These pins are outputs in PPFD2 mode. In PPFD1 mode, nDS1/nMTR1 pair is used and
nDS0/nMTR0 pair is unused. The unused pair is not connected to FDC and should be externally pulled-
up.
SMSC LPC47B27x
- 92 -
Rev. 08-10-04
DATASHEET
SMSC [ SMSC CORPORATION ]
