w83877atd Winbond Electronics Corp America, w83877atd Datasheet - Page 111

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

8.2.6 Configuration Register 5 (CR5), default = 00H
When the device is in Extended Function mode and EFIR is 05H, the CR5 register can be accessed
through EFDR. The bit definitions are as follows:
Bit 7- bit 4: Reserved
ECPFTHR3-0 (bit 3-0): These four bits define the FIFO threshold for the ECP mode parallel port. The
8.2.7 Configuration Register 6 (CR6), default = 00H
When the device is in Extended Function mode and EFIR is 06H, the CR6 register can be accessed
through EFDR. The bit definitions are as follows:
Bit 7- bit 6: Reserved
SEL4FDD (Bit 5): Selects four FDD mode
0
1
Selects two FDD mode (default, see Table 8-2)
Selects four FDD mode
DSA , DSB , MOA and MOB output pins are encoded as show in Table 8-3 to select
four drives.
default value is 0000 after power-up.
7
7
0
6
6
5
5
4
4
3
3
- 107 -
2
2
1
1
0
reserved
FDCTRI
reserved
FDCPWD
FIPURDWM
SEL4FDD
reserved
reserved
ECPFTHR0
ECPFTHR1
ECPFTHR2
reserved
reserved
reserved
reserved
ECPFTHR3
Publication Release Date: April 1998
W83877ATF
Version 0.51