W83977F-A Datasheet, PDF (136/182 Pages) Winbond – WINBOND I/O

W83977F-A/ W83977G-A/ W83977AF-A/ W83977AG-A
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
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)
13.3 Logical Device 1 (Parallel Port)
CR30 (Default 0x01 when PNPCSV=0 at POR)
Bit 7-1 : Reserved.
Bit 0 :
= 1 Activates the logical device.
= 0 Logical device is inactive.
CR31
Bit 7-2 : Reserved.
Bit 1 : ENRNGCK -- > Enable I/O Range check
Bit 0 : FORIORD --> Forces LDN to respond I/O read
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