W83787IF Datasheet, PDF (71/123 Pages) Winbond – WINBOND I/O WITH SERIAL-INFRARED SUPPORT

W83787IF
Three mode FDD select (EN3MODE = 1):
01 RWC = 0, selects 1.2 MB high-density FDD.
10 RWC = 1, selects 1.44 MB high-density FDD.
11 Don't care RWC, selects 720 KB double-density FDD.
FDD C type 1,0 (Bit 5,4):
These two bits select the type of FDD C.
00 Selects normal mode. When RWC = 0, the data transfer rate is 250 kb/s. When
RWC = 1, he data transfer rate is 500 kb/s.
Three mode FDD select (EN 3 MODE = 1):
01 RWC = 0, selects 1.2 MB high-density FDD.
10 RWC = 1, selects 1.44 MB high-density FDD.
11 Don't care RWC, selects 720 KB double-density FDD.
FDD D type 1, 0 (Bit 7,6):
These two bits select the type of FDD D.
00 Selects normal mode. When RWC = 0, the data transfer rate is 250 kb/s. When
RWC = 1, the data transfer rate is 500 kb/s.
Three mode FDD select (EN3MODE = 1):
01 RWC = 0, selects 1.2 MB high-density FDD.
10 RWC = 1, selects 1.44 MB high-density FDD.
11 Don't care RWC, selects 720 KB double-density FDD.
7.2.9 Configuration Register 8 (CR8) EFER = 89H, EFIR = 08H
When 89H is loaded into EFER and 08H is loaded into EFIR, the CR8 register can be accessed
through EFDR. The bit definitions are as follows:
765 432 10
Floppy Boot Drive 0
Floppy Boot Drive 1
Media ID 0
Media ID 1
SWWP
DISFDDWR
APDTMS2
APDTMS1
Notes:
APDTMS2 APDTMS1 (Bit 6, 7):
These two bits select the count-down time of the automatic power-down mode counter.
00 4 seconds
01 32 seconds
10 64 seconds
11 4 minutes
DISFDDWR (Bit 5):
This bit enables or disables FDD write data.
0
Enables FDD write
1
Disables FDD write (forces pins WE, WD to stay high)
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Publication ReleaseDate:Sep 1995
Revision A1