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FDC37C78-HT Datasheet(PDF) 23 Page - Microchip Technology |
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FDC37C78-HT Datasheet(HTML) 23 Page - Microchip Technology |
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23 / 82 page  23 Table 15 - Status Register 1 BIT NO. SYMBOL NAME DESCRIPTION 7 EN End of Cylinder The FDC tried to access a sector beyond the final sector of the track (255D*). Will be set if TC is not issued after Read or Write Data command. 6 Unused. This bit is always "0". 5 DE Data Error The FDC detected a CRC error in either the ID field or the data field of a sector. 4 OR Overrun/ Underrun Becomes set if the FDC does not receive CPU or DMA service within the required time interval, resulting in data overrun or underrun. 3 Unused. This bit is always "0". 2 ND No Data Any one of the following: 1. Read Data, Read Deleted Data command - the FDC did not find the specified sector. 2. Read ID command - the FDC cannot read the ID field without an error. 3. Read A Track command - the FDC cannot find the proper sector sequence. 1 NW Not Writable WP pin became a "1" while the FDC is executing a Write Data, Write Deleted Data, or Format A Track command. 0 MA Missing Address Mark Any one of the following: 1. The FDC did not detect an ID address mark at the specified track after encountering the index pulse from the IDX pin twice. 2. The FDC cannot detect a data address mark or a deleted data address mark on the specified track. * D= Decimal |
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