W83977G-A Nuvoton Technology Corporation of America, W83977G-A Datasheet - Page 40

• Manufacturer Part Number: W83977G-A
• Description: IC I/O CONTROLLER 128-PQFP
• Manufacturer: Nuvoton Technology Corporation of America

Specifications of W83977G-A

• Pin Count: 128
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

If three mode FDD function is enabled (EN3MODE = 1 in Logical Device 0 CRF0 bit:0), the bit
definitions are as follows:
Media ID1 Media ID0 (Bit 7, 6):
These two bits are read only. These two bits reflect the value of Logical Device 0 CRF1 bit 4,5.
Drive type ID1 Drive type ID0 (Bit 5, 4):
These two bits reflect two of the bits of Logical Device 0 CRF2. Which two bits are reflected depends
on the last drive selected in the DO REGISTER.
Floppy Boot drive 1, 0 (Bit 3, 2):
These two bits reflect the value of Logical Device 0 CRF1 bit 7,6.
Tape Sel 1, Tape Sel 0 (Bit 1, 0):
These two bits assign a logical drive number to the tape drive. Drive 0 is not available as a tape drive
and is reserved as the floppy disk boot drive.
W83977F-A/ W83977G-A/ W83977AF-A/ W83977AG-A
TAPE SEL 1
0
0
1
1
7
6
X
7
X
5
6
TAPE SEL 0
5
X
4
0
1
0
1
X
4
3
X
3
2
-32
X
2
1
1
0
0
Tape Sel 0
Tape Sel 1
Floppy boot drive 0
Floppy boot drive 1
Drive type ID0
Drive type ID1
Media ID0
Media ID1
Tape sel 1
Tape sel 0
DRIVE SELECTED
None
1
2
3