W83627HF/ F/ HG/ G
CR26 （Default 0b0s000000）
BIT
DESCRIPTION
7
SEL4FDD
0： Select two FDD mode.
1： Select four FDD mode.
6
HEFRAS
These two bits define how to enable Configuration mode. The corresponding power-on
setting pin is NRTSA （pin 51）. HEFRAS Address and Value
0： Write 87h to the location 2E twice.
1： Write 87h to the location 4Etwice.
5
LOCKREG
0： Enable R/W Configuration Registers
1： Disable R/W Configuration Registers.
4
3
Reserve
DSFDLGRQ
0： Enable FDC legacy mode on IRQ and DRQ selection, then DO register bit 3 is effec-
tive on selecting IRQ
1： Disable FDC legacy mode on IRQ and DRQ selection, then DO register bit 3 is not
effective on selecting IRQ
2
1
0
DSPRLGRQ
0： Enable PRT legacy mode on IRQ and DRQ selection, then DCR bit 4 is effective on
selecting IRQ
1： Disable PRT legacy mode on IRQ and DRQ selection, then DCR bit 4 is not effec-
tive on selecting IRQ
DSUALGRQ
0： Enable UART A legacy mode IRQ selecting, then MCR bit 3 is effective on select-
ingIRQ
1： Disable UART A legacy mode IRQ selecting, then MCR bit 3 is not effective on se-
lecting IRQ
DSUBLGRQ
0： Enable UART B legacy mode IRQ selecting, then MCR bit 3 is effective on selecting
IRQ
1： Disable UART B legacy mode IRQ selecting, then MCR bit 3 is not effective on se-
lecting IRQ
Publication Release Date: June 09, 2006
- 83 -
Revision 2.27
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