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W83977EF-AW Datasheet(PDF) 42 Page - Winbond |
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W83977EF-AW Datasheet(HTML) 42 Page - Winbond |
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42 / 142 page  W83977EF-AW/W83977EG-AW -40- Status Register 1 (ST1) Missing Address Mark. 1 When the FDC cannot detect the data address mark or the data address mark has been deleted. NW (Not Writable). 1 If a write Protect signal is detected from the diskette drive during execution of write data. ND (No DATA). 1 If specified sector cannot be found during execution of a read, write or verifly data. Not used. This bit is always 0. OR (Over Rum). 1 If the FDC is not serviced by the host system within a certain time interval during data transfer. DE (data Error).1 When the FDC detects a CRC error in either the ID field or the data field. Not used. This bit is always 0. EN (End of track). 1 When the FDC tries to access a sector beyond the final sector of a cylinder. 0 1 2 3 4 5 6 7 Status Register 2 (ST2) 1 2 3 4 5 6 70 BC (Bad Cylinder) MD (Missing Address Mark in Data Field). 1 If the FDC cannot find a data address mark (or the address mark has been deleted) when reading data from the media 0 No error 1 Bad Cylinder 0 No error SN (Scan Not satisfied) 1 During execution of the Scan command 0 No error SH (Scan Equal Hit) 1 During execution of the Scan command, if the equal condition is satisfied 0 No error WC (Wrong Cylinder) 1 Indicates wrong Cylinder DD (Data error in the Data field) 1 If the FDC detects a CRC error in the data field 0 No error CM (Control Mark) 1 During execution of the read data or scan command 0 No error Not used. This bit is always 0 Status Register 3 (ST3) 1 2 3 4 5 6 7 0 US0 Unit Select 0 US1 Unit Select 1 HD Head Address TS Two-Side TO Track 0 RY Ready WP Write Protected FT Fault |
Similar Part No. - W83977EF-AW |
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Similar Description - W83977EF-AW |
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