W83977F Datasheet, PDF (137/181 Pages) Winbond – PLUG & PLAY 1.0A COMPLIANT

W83977F/ W83977AF
Bit 4-3 : DRTS1, DRTS0 : Data Rate Table select (Refer to TABLE A).
= 00 Select Regular drives and 2.88 format
= 01 Specifical application
= 10 2 Meg Tape
= 11 Reserved
PRELIMINARY
Bit 2 : Reserved.
Bit 1:0 : DMOD0, DMOD1 : Drive Model select (Refer to TABLE B).
CRF5 (Default 0x00)
FDD1 Selection : Same as FDD0 of CRF4.
TABLE A
Drive Rate Table
Select
DRTS1 DRTS0
Data Rate
DRATE1 DRATE0
Selected Data Rate
MFM
FM
1
1
1Meg
---
0
0
0
0
500K
250K
0
1
300K
150K
1
0
250K
125K
1
1
1Meg
---
0
1
0
0
500K
250K
0
1
500K
250K
1
0
250K
125K
1
1
1Meg
---
1
0
0
0
500K
250K
0
1
2Meg
---
1
0
250K
125K
Note:Refer to CRF2 for SELDEN value in the cases when CRF0, bit0=1.
SELDEN
CRF0 bit 0=0
1
1
0
0
1
1
0
0
1
1
0
0
TABLE B
DMOD0
0
0
1
1
DMOD1
0
1
0
1
DRVDEN0(pin 2)
SELDEN
DRATE1
SELDEN
DRATE0
DRVDEN1(pin 3)
DRATE0
DRATE0
DRATE0
DRATE1
DRIVE TYPE
4/2/1 MB 3.5
2/1 MB 5.25
2/1.6/1 MB 3.5 (3-MODE)
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Publication Release Date: March 1998
Revision 0.58