w83877atd Winbond Electronics Corp America, w83877atd Datasheet - Page 139

• Manufacturer Part Number: w83877atd
• Description: Winbond I/o
• Manufacturer: Winbond Electronics Corp America

DIS_PRECOMP0 (bit 2):
This bit controls if precompensation is enabled for FDD A.
DRTB1, DRTB0 (bit 4 - bit 3):
These two bits combining with data rate selection bits in Date Rate Register select the operational
data rate for FDD B as shown in last table.
DIS_PRECOMP1 (bit 5):
This bit controls if precompensation is enabled for FDD B.
Bit 7 - bit 6: Rreserved.
8.2.38 Configuration Register 2E (CR2E), default = 2eH
When the device is in Extended Function mode and EFIR is 2eH, the CR2E register can be accessed
through EFDR. The bit definitions are as follows:
ENPNF (Bit 0):
nEN16SA (Bit 1):
INVRD (Bit 2):
0 enable precompensation for FDD A
1 disable precompensation for FDD A
0 enable precompensation for FDD B
1 disable precompensation for FDD B
0
1
0
1
1
0
Disable Printer Not Floppy function. (Default)
Enable Printer Not Floopy function.
Enable 16-bit address decoder in the ISA bus. If the function of full ISA address
decoder is used, the device of COM B will be Changed to SIR/FIR function
automatically.
Disable 16-bit address decoder in the ISA bus.
Disable inverting RDATA from floppy disk input signal. (Default)
Enable inverting RDATA from floppy disk input signal.
7
6
5
4
3
- 135 -
2
1
0
nEN16SA
ENPNF
INVRD
EN24X2M
DIS_BST
Reserved
Reserved
Reserved
Publication Release Date: April 1998
W83877ATF
Version 0.51