FDC37C669 datasheet(71/164 Pages) SMSC

71 / 164 page

PARALLEL PORT FLOPPY DISK CONTROLLER

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.

These modes can be

selected in Configuration Register 4.

PPFD1

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

Drive 1 is on the Parallel port pins

PPFD2: Drive 0 is on the Parallel port pins

Drive 1 is on the Parallel port pins

When the PPFDC is selected the following pins

are set as follows:

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.

The following parallel port pins are read as

follows by a read of the parallel port register:

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.

The following FDC pins are all in the high

impedence state when the PPFDC is actually

selected by the drive select register:

nWDATA, DENSEL, nHDSEL, nWGATE,

nDIR,

nSTEP,

nDS1,

nDS0,

nMTRO,

nMTR1.

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 32.

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