FDC37C669_07 SMSC [SMSC Corporation], FDC37C669_07 Datasheet - Page 71

• Manufacturer Part Number: FDC37C669_07
• Description: PC 98/99 Compliant Super I/O Floppy Disk Controller with Infrared Support
• Manufacturer: SMSC [SMSC Corporation]

In this mode, the Floppy Disk Control signals
are available on the parallel port pins. When
this mode is selected, the parallel port is not
available. There are two modes of operation,
PPFD1 and PPFD2.
selected in Configuration Register 4.
has only drive 1 on the parallel port pins; PPFD2
has drive 0 and 1 on the parallel port pins.
PPFD1: Drive 0 is on the FDC pins
PPFD2: Drive 0 is on the Parallel port pins
When the PPFDC is selected the following pins
are set as follows:
1.
2.
3.
nDACK: Assigned to the parallel port device
during configuration.
PDRQ (assigned to the parallel port): not
ECP = high-Z, ECP & dmaEn = 0, ECP &
not dmaEn = high-Z
IRQ assigned to the parallel port: not active,
this is hi-Z or Low depending on settings.
Drive 1 is on the Parallel port pins
Drive 1 is on the Parallel port pins
PARALLEL PORT FLOPPY DISK CONTROLLER
These modes can be
PPFD1
71
The following parallel port pins are read as
follows by a read of the parallel port register:
1.
2.
3.
The following FDC pins are all in the high
impedence state when the PPFDC is actually
selected by the drive select register:
1.
2.
The FDC signals are muxed onto the Parallel
Port pins as shown in Table 32.
Data Register (read) = last Data Register
(write)
Control Register are read as "cable not
connected" STROBE, AUTOFD and SLC =
0 and nINIT = 1;
Status Register reads: nBUSY = 0, PE = 0,
SLCT = 0, nACK = 1, nERR = 1.
nWDATA, DENSEL, nHDSEL, nWGATE,
nDIR,
nMTR1.
If PPFDx is selected, then the parallel port
can not be used as a parallel port until
"Normal" mode is selected.
nSTEP,
nDS1,
nDS0,
nMTRO,