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FDC37C78-HT Datasheet(PDF) 47 Page - Microchip Technology |
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FDC37C78-HT Datasheet(HTML) 47 Page - Microchip Technology |
47 / 82 page ![]() 47 Table 24 - Result Phase Table MT HEAD FINAL SECTOR TRANSFERRED TO HOST ID INFORMATION AT RESULT PHASE C H R N 0 0 Less than EOT NC NC R + 1 NC Equal to EOT C + 1 NC 01 NC 1 Less than EOT NC NC R + 1 NC Equal to EOT C + 1 NC 01 NC 1 0 Less than EOT NC NC R + 1 NC Equal to EOT NC LSB 01 NC 1 Less than EOT NC NC R + 1 NC Equal to EOT C + 1 LSB 01 NC NC: No Change, the same value as the one at the beginning of command execution. LSB: Least Significant Bit, the LSB of H is complemented. Write Data After the Write Data command has been issued, the FDC loads the head (if it is in the unloaded state), waits the specified head load time if unloaded (defined in the Specify command), and begins reading ID fields. When the sector address read from the diskette matches the sector address specified in the command, the FDC reads the data from the host via the FIFO and writes it to the sector's data field. After writing data into the current sector, the FDC computes the CRC value and writes it into the CRC field at the end of the sector transfer. The Sector Number stored in "R" is incremented by one, and the FDC continues writing to the next data field. The FDC continues this "Multi-Sector Write Operation". Upon receipt of a terminal count signal or if a FIFO over/under run occurs while a data field is being written, then the remainder of the data field is filled with zeros. The FDC reads the ID field of each sector and checks the CRC bytes. If it detects a CRC error in one of the ID fields, it sets the IC code in Status Register 0 to "01" (abnormal termination), sets the DE bit of Status Register 1 to "1", and terminates the Write Data command. The Write Data command operates in much the same manner as the Read Data command. The following items are the same. Please refer to the Read Data Command for details: • Transfer Capacity • EN (End of Cylinder) bit • ND (No Data) bit • Head Load, Unload Time Interval • ID information when the host terminates the command • Definition of DTL when N = 0 and when N does not = 0 |
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