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PC8477BVF-1 Datasheet(PDF) 29 Page - National Semiconductor (TI) |
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PC8477BVF-1 Datasheet(HTML) 29 Page - National Semiconductor (TI) |
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29 / 54 page  40 Command Set Description (Continued) TABLE 4-16 Verify Command Result Phase Table MT EC SCEOT Value Termination Result 0 0 DTL used (should be FF hex) No Errors EOT s Sectors per Side 0 0 DTL used (should be FF hex) Abnormal Termination EOT l Sectors per Side 01 SC s Sectors per Side No Errors AND SC s EOT 01 SC l Sectors Remaining Abnormal Termination OR SC l EOT 1 0 DTL used (should be FF hex) No Errors EOT s Sectors per Side 1 0 DTL used (should be FF hex) Abnormal Termination EOT l Sectors per Side 11 SC s Sectors per Side No Errors AND SC s EOT 11 SC s (EOT x 2) No Errors AND EOT s Sectors per Side 11 SC l (EOT x 2) Abnormal Termination Note 1 Sectors per Side e number of formatted sectors per each side of the disk Note 2 Sectors Remaining e number of formatted sectors left which can be read which includes side 1 of the disk if the MT bit is set to 1 Note 3 If MT e 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 4222 Version Command The Version command can be used to determine the floppy controller being used The Result Phase uniquely identifies the floppy controller version The PC8477B returns a value of 90 hex in order to be compatible with the 82077 The DP8473 and other NEC765 compatible controllers will re- turn a value of 80 hex (invalid command) 4223 Write Data Command The Write Data command receives data from the host and writes logical sectors containing a Normal Data AM to the selected drive The operation of this command is similar to the Read Data command except that the data is transferred from the mP to the controller instead of the other way around The controller will simulate the Motor On time before start- ing the operation If implied seeks are enabled the seek and sense interrupt functions are then performed The controller then starts the Data Separator and waits for the Data Sepa- rator to find the next sector Address Field The controller compares the Address ID (track head sector bytes per sector) with the desired ID specified in the Command Phase If there is no match the controller waits to find the next sector Address Field This process continues until the desired sector is found If an error condition occurs the IC bits in ST0 are set to Abnormal Termination and the con- troller enters the Result Phase Possible errors are 1 The mP aborted the command by writing to the FIFO If there is no disk in the drive the controller will hang up The mP must then take the controller out of this hung state by writing a byte to the FIFO This will put the con- troller into the Result Phase 2 Two index pulses were detected since the search began and no valid ID has been found If the track address ID differs the WT bit or BT bit (if the track address is FF hex) will be set in ST2 If the head sector or bytes per sector code did not match the ND bit is set in ST1 If the Ad- dress Field AM was never found the MA bit is set in ST1 3 The Address Field was found with a CRC error The CE bit is set in ST1 4 If the controller detects the Write Protect disk interface input is asserted bit 1 of ST1 is set If the correct Address Field is found the controller waits for all (conventional mode) or part (perpendicular mode) of GAP2 to pass The controller will then write the preamble field address marks and data bytes to the Data Field The data bytes are transferred to the controller by the mP Having finished writing the sector the controller will contin- ue reading the next logical sector unless one or more of the following termination conditions occurred 1 The DMA controller asserted TC The IC bits in ST0 are set to Normal Termination 2 The last sector address (of side 1 if MT was set) was equal to EOT The EOT bit in ST1 is set The IC bits in ST0 are set to Abnormal Termination This is the expect- ed condition during Non-DMA transfers 3 Underrun error The OR bit in ST1 is set The IC bits in ST0 are set to Abnormal Termination If the mP cannot service a transfer request in time the last correctly writ- ten byte will be written to the disk 29 |
Similar Part No. - PC8477BVF-1 |
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Similar Description - PC8477BVF-1 |
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