W83977ATF Datasheet, PDF (138/207 Pages) Winbond – WINBOND I/O

W83977ATF
PRELIMINARY
CRF2 (Default 0xFF)
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.
DTYPE1 DPYTE0
0
0
0
0
0
0
0
0
0
1
1
0
1
1
Note: X means don't care.
DRATE1
1
0
0
1
X
X
0
DRATE0
1
0
1
0
X
X
1
SELDEN
1
1
0
0
0
1
0
- 138.1 -
Publication Release Date: Auguest 1997
Revision 0.51