w83627sf Winbond Electronics Corp America, w83627sf Datasheet - Page 85
w83627sf
Manufacturer Part Number
w83627sf
Description
Winbond I/o
Manufacturer
Winbond Electronics Corp America
Datasheet
1.W83627SF.pdf
(147 pages)
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6.3.15 DMA Transfers
DMA transfers are always to or from the ecpDFifo, tFifo, or CFifo. The DMA uses the standard PC DMA
services. The ECP requests DMA transfers from the host by activating the PDRQ pin. The DMA will
empty or fill the FIFO using the appropriate direction and mode. When the terminal count in the DMA
controller is reached, an interrupt is generated and serviceIntr is asserted, which will disable the DMA.
6.3.16
The ECP or parallel port FIFOs can also be operated using interrupt driven programmed I/O.
Programmed I/O transfers are to the ecpDFifo at 400H and ecpAFifo at 000H or from the ecpDFifo
located at 400H, or to/from the tFifo at 400H. The host must set the direction, state, dmaEn = 0 and
serviceIntr = 0 in the programmed I/O transfers.
The ECP requests programmed I/O transfers from the host by activating the IRQ pin. The programmed
I/O will empty or fill the FIFO using the appropriate direction and mode.
6.4 Extension FDD Mode (EXTFDD)
In this mode, the W83627SF changes the printer interface pins to FDC input/output pins, allowing the
user to install a second floppy disk drive (FDD B) through the DB-25 printer connector. The pin
assignments for the FDC input/output pins are shown in Table 6-1.
After the printer interface is set to EXTFDD mode, the following occur:
(1) Pins MOB# and DSB# will be forced to inactive state.
(2) Pins DSKCHG# , RDATA# , WP# , TRAK0# , INDEX# will be logically ORed with pins PD4-PD0 to
(3) Pins PD4-PD0 each will have an internal resistor of about 1K ohm to serve as pull-up resistor for FDD
(4) If the parallel port is set to EXTFDD mode after the system has booted DOS or another operating
serve as input signals to the FDC.
open drain/collector output.
system, a warm reset is needed to enable the system to recognize the extension floppy drive.
Programmed I/O (NON-DMA) Mode
- 78 -
Publication Release Date: Nov. 2000
PRELIMINARY
W83627SF
Revision 0.60
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