W83L517D_05 Datasheet, PDF (118/133 Pages) Winbond – LPC I/O for Notebook

W83L517D/W83L517D-F
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
CRF4 (Default 0x00)
FDD0 Selection:
Bit 7: Reserved.
Bit 6: Precomp. Disable.
= 1 Disable FDC Precompensation.
= 0 Enable FDC Precompensation.
Bit 5: Reserved.
Bit 4 - 3: DRTS1, DRTS0: Data Rate Table select (Refer to TABLE A).
= 00 Select Regular drives and 2.88 format
= 01 3-mode drive
= 10 2 Meg Tape
= 11 Reserved
Bit 2: Reserved.
Bit 1:0: DTYPE0, DTYPE1: Drive Type select (Refer to TABLE B).
CRF5 (Default 0x00)
FDD1 Selection: Same as FDD0 of CRF4.
TABLE A
DRIVE RATE TABLE SELECT
DATA RATE
SELECTED DATA RATE
DRTS1
DRTS0
DRATE1 DRATE0
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
SELDEN
1
1
0
0
1
1
0
0
1
1
0
0
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