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FDC37B78X Datasheet(PDF) 61 Page - SMSC Corporation |
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FDC37B78X Datasheet(HTML) 61 Page - SMSC Corporation |
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61 / 258 page  61 Because data is not transferred to the host, TC (pin 89) cannot be used to terminate this command. By setting the EC bit to "1", an implicit TC will be issued to the FDC. This implicit TC will occur when the SC value has decremented to 0 (an SC value of 0 will verify 256 sectors). This command can also be terminated by setting the EC bit to "0" and the EOT value equal to the final sector to be checked. If EC is set to "0", DTL/SC should be programmed to 0FFH. Refer to Table 27 and Table 28 for information concerning the values of MT and EC versus SC and EOT value. Definitions: # Sectors Per Side = Number of formatted sectors per each side of the disk. # Sectors Remaining = Number of formatted sectors left which can be read, including side 1 of the disk if MT is set to "1". TABLE 28 - VERIFY COMMAND RESULT PHASE MT EC SC/EOT VALUE TERMINATION RESULT 0 0 SC = DTL EOT ≤ # Sectors Per Side Success Termination Result Phase Valid 0 0 SC = DTL EOT > # Sectors Per Side Unsuccessful Termination Result Phase Invalid 0 1 SC ≤ # Sectors Remaining AND EOT ≤ # Sectors Per Side Successful Termination Result Phase Valid 0 1 SC > # Sectors Remaining OR EOT > # Sectors Per Side Unsuccessful Termination Result Phase Invalid 1 0 SC = DTL EOT ≤ # Sectors Per Side Successful Termination Result Phase Valid 1 0 SC = DTL EOT > # Sectors Per Side Unsuccessful Termination Result Phase Invalid 1 1 SC ≤ # Sectors Remaining AND EOT ≤ # Sectors Per Side Successful Termination Result Phase Valid 1 1 SC > # Sectors Remaining OR EOT > # Sectors Per Side Unsuccessful Termination Result Phase Invalid Note: If MT is set to "1" and the SC value is greater than the number of remaining formatted sectors on Side 0, verifying will continue on Side 1 of the disk. Format A Track The Format command allows an entire track to be formatted. After a pulse from the IDX pin is detected, the FDC starts writing data on the disk including gaps, address marks, ID fields, and data fields per the IBM System 34 or 3740 format (MFM or FM respectively). The particular values that will be written to the gap and data field are controlled by the values programmed into N, SC, GPL, and D which are specified by the host during the command phase. The data field of the sector is filled with the data byte specified by D. The ID field for each sector is supplied by the host; that is, four data bytes per sector are needed by the FDC for C, H, R, and N (cylinder, head, sector number and sector size respectively). After formatting each sector, the host must send new values for C, H, R and N to the FDC for the next sector on the track. The R value (sector number) is the only value that must be changed by the host after each sector is formatted. This allows the disk to be formatted with |
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