w83977atf Winbond Electronics Corp America, w83977atf Datasheet - Page 139

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w83977atf

Manufacturer Part Number
w83977atf
Description
Winbond I/o
Manufacturer
Winbond Electronics Corp America
Datasheet

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Manufacturer
Quantity
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Manufacturer:
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CRF4 (Default 0x00)
FDD0 Selection:
CRF5 (Default 0x00)
FDD1 Selection: Same as FDD0 of CRF4.
TABLE A
Note:Refer to CRF2 for SELDEN value in the cases when CRF0, bit0=1.
TABLE B
DMOD0
DRTS1
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:
Drive Rate Table
0
0
1
0
0
1
1
Select
= 1
= 0
= 00 Select Regular drives and 2.88 format
= 01
= 10 2 Meg Tape
= 11 Reserved
DMOD0, DMOD1
DRTS0
DMOD1
Disable FDC Precompensation.
Enable FDC Precompensation.
Specifical application
0
1
0
0
1
0
1
DRATE1
DRVDEN0(pin 2)
: Drive Model select (Refer to TABLE B).
1
0
0
1
1
0
0
1
1
0
0
1
SELDEN
DRATE1
SELDEN
DRATE0
Data Rate
DRATE0
1
0
1
0
1
0
1
0
1
0
1
0
- 139 -
DRVDEN1(pin 3)
Selected Data Rate
1Meg
1Meg
1Meg
2Meg
MFM
500K
300K
250K
500K
500K
250K
500K
250K
DRATE0
DRATE0
DRATE0
DRATE1
250K
150K
125K
250K
250K
125K
250K
125K
FM
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Publication Release Date:April 1998
4/2/1 MB 3.5 ”“
2/1 MB 5.25”
2/1.6/1 MB 3.5 ” (3-MODE)
CRF0 bit 0=0
W83977ATF
SELDEN
DRIVE TYPE
PRELIMINARY
1
1
0
0
1
1
0
0
1
1
0
0
Revision 0.52

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