FDC37N869 View Datasheet(PDF) - SMSC -> Microchip
Part Name
Description
MFG CO.
FDC37N869
SMSC -> Microchip
'FDC37N869' PDF : 147 Pages View PDF
3. IRQ assigned to the parallel port: not active, this is hi-Z or Low depending on settings.
The following parallel port pins are read as follows by a read of the parallel port register:
1. Data Register (read) = last Data Register (write)
2. Control Register are read as “cable not connected” STROBE, AUTOFD and SLC = 0 and nINIT = 1;
3. Status Register reads: nBUSY = 0, PE = 0, SLCT = 0, nACK = 1, nERR = 1.
The following FDC pins are all in the high impedance state when the PPFDC is actually selected by the drive select
register:
1. nWDATA, DENSEL, nHDSEL, nWGATE, nDIR, nSTEP, nDS1, nDS0, nMTRO, nMTR1.
2. If PPFDx is selected, then the parallel port can not be used as a parallel port until “Normal” mode is selected.
The FDC signals are muxed onto the Parallel Port pins as shown in Table 46
.
Table 46 - FDC Parallel Port Pins
CONNECTOR
PIN #
CHIP PIN # SPP MODE PIN DIRECTION FDC MODE
1
75
nSTB
I/O
(nDS0)
2
69
PD0
I/O
nINDEX
3
68
PD1
I/O
nTRK0
4
67
PD2
I/O
nWP
5
66
PD3
I/O
nRDATA
6
64
PD4
I/O
nDSKCHG
7
63
PD5
I/O
8
62
PD6
I/O
(nMTR0)
9
61
PD7
I/O
10
60
nACK
I
nDS1
11
59
BUSY
I
nMTR1
12
58
PE
I
nWDATA
13
57
SLCT
I
nWGATE
14
74
nAFD
I/O
nDENSEL
15
73
nERR
I
nHDSEL
16
72
nINIT
I/O
nDIR
17
71
nSLIN
I/O
nSTEP
PIN DIRECTION
I/(0)1
I
I
I
I
I
I/(0) 1
0
0
0
0
0
0
0
0
Note1: These pins are outputs in mode PPFD2. Inputs in mode PPFD1
For ACPI compliance the FDD pins that are multiplexed onto the Parallel Port must 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 should function normally regardless of the Parallel Port Power control CR01.2. Table 47 illustrates this
functionality.
PARALLEL
PORT POWER
CR01.2
1
0
X
Table 47 - Parallel Port FDD Control
PARALLEL PORT FDC
PARALLEL PORT
CONTROL
FDC STATE
CR04.3
CR04.2
0
0
OFF
0
0
OFF
1
X
ON
X
1
PARALLEL
PORT STATE
ON
OFF
OFF1
SMSC DS – FDC37N869
Page 58
Rev. 11/09/2000
Share Link: 