W83627EHF_0611 Datasheet, PDF (100/144 Pages) Winbond – WINBOND LPC I/O

W83627EHF/EF, W83627EHG/EG
CR 26h. (Global Option; Default 0s000000b) s: value by strapping
BIT READ / WRITE
DESCRIPTION
SEL4FDD =>
7
R/W
= 0 Select two FDD mode.
= 1 Select four FDD mode.
HEFRAS =>
= 0 Write 87h to location 2E twice.
6
R/W
= 1 Write 87h to location 4E twice.
The corresponding power-on strapping pin is RTSA# (pin 51).
LOCKREG =>
5
R/W
= 0 Enable R/W configuration registers.
= 1 Disable R/W configuration registers.
4 Reserved.
DSFDLGRQ =>
= 0 Enable FDC legacy mode on IRQ and DRQ selection, then DO
3
R/W
register (base address + 2) bit 3 is effective on selecting IRQ.
= 1 Disable FDC legacy mode on IRQ and DRQ selection, then DO
register (base address + 2) bit 3 is not effective on selecting IRQ.
DSPRLGRQ =>
= 0 Enable PRT legacy mode on IRQ and DRQ selection, then DCR
2
R/W
register (base address + 2) bit 4 is effective on selecting IRQ.
= 1 Disable PRT legacy mode on IRQ and DRQ selection, then DCR
register (base address + 2) bit 4 is not effective on selecting IRQ.
DSUALGRQ =>
= 0 Enable UART A legacy mode on IRQ selection, then HCR register
1
R/W
(base address + 4) bit 3 is effective on selecting IRQ.
= 1 Disable UART A legacy mode on IRQ selection, then HCR
register (base address + 4) bit 3 is not effective on selecting IRQ.
DSUBLGRQ =>
= 0 Enable UART B legacy mode on IRQ selection, then HCR register
0
R/W
(base address + 4) bit 3 is effective on selecting IRQ.
= 1 Disable UART B legacy mode on IRQ selection, then HCR
register (base address + 4) bit 3 is not effective on selecting IRQ.
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