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FDC37C78-HT Datasheet(PDF) 45 Page - Microchip Technology |
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FDC37C78-HT Datasheet(HTML) 45 Page - Microchip Technology |
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45 / 82 page  45 At the completion of the Read Data command, the head is not unloaded until after the Head Unload Time Interval (specified in the Specify command) has elapsed. If the host issues another command before the head unloads, then the head settling time may be saved between subsequent reads. If the FDC detects a pulse on the nINDEX pin twice without finding the specified sector (meaning that the diskette's index hole passes through index detect logic in the drive twice), the FDC sets the IC code in Status Register 0 to "01" indicating abnormal termination, sets the ND bit in Status Register 1 to "1" indicating a sector not found, and terminates the Read Data Command. After reading the ID and Data Fields in each sector, the FDC checks the CRC bytes. If a CRC error occurs in the ID or data field, the FDC sets the IC code in Status Register 0 to "01" indicating abnormal termination, sets the DE bit flag in Status Register 1 to "1", sets the DD bit in Status Register 2 to "1" if CRC is incorrect in the ID field, and terminates the Read Data Command. Table 22 describes the effect of the SK bit on the Read Data command execution and results. Except where noted in Table 22, the C or R value of the sector address is automatically incremented (see Table 24). Table 21 - Effects of MT and N Bits MT N MAXIMUM TRANSFER CAPACITY FINAL SECTOR READ FROM DISK 0 1 0 1 0 1 1 1 2 2 3 3 256 x 26 = 6,656 256 x 52 = 13,312 512 x 15 = 7,680 512 x 30 = 15,360 1024 x 8 = 8,192 1024 x 16 = 16,384 26 at side 0 or 1 26 at side 1 15 at side 0 or 1 15 at side 1 8 at side 0 or 1 16 at side 1 Table 22 - Skip Bit vs Read 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 Yes No No Yes No Yes Normal termination. Address not incremented. Next sector not searched for. Normal termination. Normal termination. Sector not read ("skipped"). |
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