參數(shù)資料
型號: 37C669
廠商: SMSC Corporation
英文描述: DIODE SCHOTTKY SINGLE 25V 200mW 0.5V-vf 200mA-IFM 30mA-IF 2uA-IR SOD-323 3K/REEL
中文描述: 電腦98/99順從超級I / O軟盤控制器與紅外線支持
文件頁數(shù): 134/164頁
文件大?。?/td> 621K
代理商: 37C669
71
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:
1.
nDACK: Assigned to the parallel port device
during configuration.
2.
PDRQ (assigned to the parallel port): not
ECP = high-Z, ECP & dmaEn = 0, ECP &
not dmaEn = high-Z
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
impedence 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 32.
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