W83787IF Datasheet, PDF (70/123 Pages) Winbond – WINBOND I/O WITH SERIAL-INFRARED SUPPORT

W83787IF
FDCPWD (Bit 3):
This bit controls the power to the FDC.
0
Power is supplied to the FDC.
1
Puts the FDC in power-down mode.
IDEPWD (Bit 2):
This bit controls the power of the IDE.
0
Power is supplied to the IDE.
1
Puts the IDE in power-down mode.
FDCTRI (Bit 1):
This bit enables or disables the tri-state outputs of the FDC in power-down mode.
0
The output pins of the FDC will not be tri-stated when FDC is in power-down mode.
1
The output pins of the FDC will be tri-stated when FDC is in power-down mode.
IDETRI (BIt 0):
This bit enables or disables the tri-state outputs of the IDE in power-down mode.
0
The output pins of the IDE will not be tri-stated when IDE is in power-down mode.
1
The output pins of the IDE will be tri-stated when IDE is in power-down mode.
7.2.8 Configuration Register 7 (CR7) EFER = 89H, EFIR = 07H
When 89H is loaded into EFER and 07H is loaded into EFIR, the CR7 register can be accessed
through EFDR. The bit definitions are as follows:
76 5432 10
FDD A type 0
FDD A type 1
FDD B type 0
FDD B type 1
FDD C type 0
FDD C type 1
FDD D type 0
FDD D type 1
Notes:
FDD A type 1, 0 (Bit 1, 0):
These two bits select the type of FDD A.
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.
FDD B type 1,0 (Bit 3,2):
These two bits select the type of FDD B.
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.
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Publication ReleaseDate:Sep 1995
Revision A1