W83877TF Datasheet, PDF (117/154 Pages) Winbond – I/O chip disk drive adapter

W83877TF
PRIRQOD (Bit 4):
0
printer IRQ ports are totem-poles in SPP mode and open-drains in ECP/EPP mode.
1
printer IRQ ports are totem-poles in all modes.
DSFDLGRQ (Bit 3):
0
enable FDC legacy mode on IRQ and DRQ selections. DO register bit 3 has effect on
selecting IRQ.
1
disable FDC legacy mode on IRQ and DRQ selections. DO register bit 3 has no effect
on selecting IRQ.
DSPRLGRQ (Bit 2):
0
enable PRT legacy mode on IRQ and DRQ selections. DCR bit 4 has effect on
selecting IRQ.
1
disable PRT legacy mode on IRQ and DRQ selections. DCR bit 4 has no effect on
selecting IRQ.
DSUALGRQ (Bit 1):
0
enable UART A legacy mode on IRQ selection. MCR bit 3 has effect on selecting IRQ.
1
disable UART A legacy mode on IRQ selection. MCR bit 3 has no effect on selecting
IRQ.
DSUBLGRQ (Bit 0):
0
enable UART B legacy mode on IRQ selection. MCR bit 3 has effect on selecting IRQ.
1
disable UART B legacy mode on IRQ selection. MCR bit 3 has no effect on selecting
IRQ.
8.2.24 Configuration Register 18 (CR18), default=00H
When the device is in Extended Function mode and EFIR is 18H, the CR18 register can be accessed
through EFDR. The bit definitions are as follows:
765
43
21
0
SHARA
SHARB
SHARC
SHARD
SHARE
SHARF
SHARG
SHARH
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Publication Release Date: March 1998
Version 0.61