w83977ctf Winbond Electronics Corp America, w83977ctf Datasheet - Page 111

• Manufacturer Part Number: w83977ctf
• Description: Winbond I/o
• Manufacturer: Winbond Electronics Corp America

CRF2 (Default 0xFF)
CRF4 (Default 0x00)
FDD0 Selection:
Bit 7 - 6: FDD D Drive Type
Bit 5 - 4: FDD C Drive Type
Bit 3 - 2: FDD B Drive Type
Bit 1:0: FDD A Drive Type
When FDD is in enhanced 3-mode(CRF0.bit0=1), these bits determine SELDEN value in TABLE
A of CRF4 and CRF5 as follows.
Note: X means don't care.
Bit 7: Reserved.
Bit 6: Precomp. Disable.
Bit 5: Reserved.
Bit 4 - 3: DRTS1, DRTS0: Data Rate Table select (Refer to TABLE A).
Bit 2: Reserved.
Bit 1:0: DMOD0, DMOD1 : Drive Model select (Refer to TABLE B).
DTYPE1
= 1
= 0
= 00 Select Regular drives and 2.88 format
= 01 Specifical application
= 10 2 Meg Tape
= 11 Reserved
0
0
0
0
0
1
1
Disable FDC Precompensation.
Enable FDC Precompensation.
DPYTE0
0
0
0
0
1
0
1
DRATE1
X
X
1
0
0
1
0
-102 -
DRATE0
X
X
1
0
1
0
1
SELDEN
Publication Release Date: March 1999
1
1
0
0
0
1
0
W83977EF/ CTF
PRELIMINARY
Revision A1