LPC47S457-NC SMSC [SMSC Corporation], LPC47S457-NC Datasheet - Page 93

• Manufacturer Part Number: LPC47S457-NC
• Description: Advanced I/O with X-Bus Interface
• Manufacturer: SMSC [SMSC Corporation]

For ACPI compliance the FDD pins that are multiplexed onto the Parallel Port function independently of the state of
the Parallel Port controller. For example, if the FDC is enabled onto the Parallel Port the multiplexed FDD interface
functions normally regardless of the Parallel Port Power control, CR22.3. Table 40 illustrates this functionality.
CR22.3
1
0
X
Note
i.e., STROBE = AUTOFD = SLC = 0 and nINIT = 1.
Note 1: These pins are outputs in mode PPFD2, inputs in mode PPFD1.
SMSC DS – LPC47S45x
PARALLEL PORT
CONNECTOR
1
PIN #
POWER
:
10
11
12
13
14
15
16
17
1
2
3
4
5
6
7
8
9
The Parallel Port Control register reads as “Cable Not Connected” when the Parallel Port FDC is enabled;
CHIP PIN #
LD3:CRF1.1
0
0
1
X
QFP
83
68
69
70
71
72
73
74
75
80
79
78
77
82
81
66
67
PARALLEL PORT FDC
Table 40 − Modified Parallel Port FDD Control
CONTROL
SPP MODE
nSTROBE
nERROR
nSLCTIN
Table 41 − FDC Parallel Port Pins
BUSY
nACK
SLCT
nALF
nINIT
PD0
PD1
PD2
PD3
PD4
PD5
PD6
PD7
PE
DATASHEET
LD3:CRF1.0
0
0
X
1
Page 93 of 259
DIRECTION
PIN
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I
I
I
I
I
OFF
OFF
ON
PARALLEL PORT
FDC STATE
FDC MODE
nDSKCHG
DRVDEN0
nWGATE
nWDATA
nRDATA
(nMTR0)
nHDSEL
nINDEX
nMTR1
(nDS0)
nTRK0
nSTEP
nDS1
nDIR
nWP
-
-
ON
OFF
OFF
(Note
PARALLEL PORT
1
DIRECTION
I/(O) Note1
I/(O) Note1
STATE
)
PIN
O
O
O
O
O
O
O
O
I
I
I
I
I
-
-
Rev. 07/09/2001