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FDC37C78-HT Datasheet(PDF) 46 Page - Microchip Technology |
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FDC37C78-HT Datasheet(HTML) 46 Page - Microchip Technology |
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46 / 82 page  46 Read Deleted Data This command is the same as the Read Data command, only it operates on sectors that contain a Deleted Data Address Mark at the beginning of a Data Field. Table 2 3 describes the effect of the SK bit on the Read Deleted Data command execution and results. Except where noted in Table 25, the C or R value of the sector address is automatically incremented (see Table 26). Table 23 - Skip Bit vs. Read Deleted Data Command DATA ADDRESS RESULTS SK BIT VALUE MARK TYPE ENCOUNTERED SECTOR READ? CM BIT OF ST2 SET? DESCRIPTION OF RESULTS 0 0 1 1 Normal Data Deleted Data Normal Data Deleted Data Yes Yes No Yes Yes No Yes No Address not incremented. Next sector not searched for. Normal termination. Normal termination. Sector not read ("skipped"). Normal termination. Read A Track This command is similar to the Read Data command except that the entire data field is read continuously from each of the sectors of a track. Immediately after encountering a pulse on the nINDEX pin, the FDC starts to read all data fields on the track as continuous blocks of data without regard to logical sector numbers. If the FDC finds an error in the ID or DATA CRC check bytes, it continues to read data from the track and sets the appropriate error bits at the end of the command. The FDC compares the ID information read from each sector with the specified value in the command and sets the ND flag of Status Register 1 to a "1" if there is no comparison. Multi- track or skip operations are not allowed with this command. The MT and SK bits (bits D7 and D5 of the first command byte respectively) should always be set to "0". This command terminates when the EOT specified number of sectors has not been read. If the FDC does not find an ID Address Mark on the diskette after the second occurrence of a pulse on the IDX pin, then it sets the IC code in Status Register 0 to "01" (abnormal termination), sets the MA bit in Status Register 1 to "1", and terminates the command. |
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