W83977AF Information Storage Devices, Inc, W83977AF Datasheet - Page 137

• Manufacturer Part Number: W83977AF
• Description: W83877TF Plus Kbc, Cir, RTC
• Manufacturer: Information Storage Devices, Inc

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 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
= 00 Select Regular drives and 2.88 format
= 01
= 10 2 Meg Tape
= 11 Reserved
DMOD0, DMOD1
DRTS0
DMOD1
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
- 125 -
DRVDEN1(pin 3)
Selected Data Rate
1Meg
1Meg
1Meg
2Meg
MFM
500K
300K
250K
500K
500K
250K
500K
250K
DRATE0
DRATE0
DRATE0
DRATE1
W83977F/ W83977AF
250K
150K
125K
250K
250K
125K
250K
125K
Publication Release Date: March 1998
FM
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4/2/1 MB 3.5
2/1 MB 5.25
2/1.6/1 MB 3.5 (3-MODE)
CRF0 bit 0=0
SELDEN
DRIVE TYPE
PRELIMINARY
1
1
0
0
1
1
0
0
1
1
0
0
Revision 0.58