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PC8477BV-1 Datasheet(PDF) 14 Page - National Semiconductor (TI) |
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PC8477BV-1 Datasheet(HTML) 14 Page - National Semiconductor (TI) |
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14 / 54 page  30 Register Description (Continued) D2 Head Select Indicates the active high status of the HDSEL pin at the end of the Execution Phase D1 – D0 Drive Select 10 These two binary encoded bits indicate the logical drive selected at the end of the Execution Phase 00 e Drive 0 selected 01 e Drive 1 selected 10 e Drive 2 selected 11 e Drive 3 selected 3102 Status Register 1 (ST1) D7 D6 D5 D4 D3 D2 D1 D0 DESC ET 0 CE OR 0 ND NW MA RESET 00 0 0 0 0 0 0 COND D7 End of Track Controller transferred the last byte of the last sector without the TC pin be- coming active The last sector is the End of Track sector number programmed in the Com- mand Phase D6 Not Used Always 0 D5 CRC Error If this bit is set and bit 5 of ST2 is clear then there was a CRC error in the Ad- dress Field of the correct sector If bit 5 of ST2 is also set then there was a CRC error in the Data Field D4 Overrun Controller was not serviced by the mP soon enough during a data transfer in the Exe- cution Phase For read operations indicates a data overrun For write operations indicates a data underrun D3 Not Used Always 0 D2 No Data Three possible problems 1 Controller cannot find the sector specified in the Command Phase during the execution of a Read Write Scan or Verify command An address mark was found however so it is not a blank disk 2 Controller cannot read any Address Fields without a CRC error during a Read ID com- mand 3 Controller cannot find starting sector during execution of Read A Track command D1 Not Writable Write Protect pin is active when a Write or Format command is issued D0 Missing Address Mark If bit 0 of ST2 is clear then the controller cannot detect any Address Field Address Mark after two disk revolutions If bit 0 of ST2 is set then the controller cannot detect the Data Field Address Mark after finding the correct Address Field 3103 Status Register 2 (ST2) D7 D6 D5 D4 D3 D2 D1 D0 DESC 0 CM CD WT SEH SNS BT MD RESET 00 0 0 0 0 0 0 COND D7 Not Used Always 0 D6 Control Mark Controller tried to read a sector which contained a deleted data address mark during execution of Read Data or Scan com- mands Or if a Read Deleted Data command was executed a regular address mark was de- tected D5 CRC Error in Data Field Controller detected a CRC error in the Data Field Bit 5 of ST1 is also set D4 Wrong Track Only set if desired sector is not found and the track number recorded on any sector of the current track is different from the track address specified in the Command Phase D3 Scan Equal Hit ‘‘Equal’’ condition satisfied dur- ing any Scan command D2 Scan Not Satisfied Controller cannot find a sector on the track which meets the desired condition during any Scan command D1 Bad Track Only set if the desired sector is not found the track number recorded on any sector on the track is FF (hex) indicating a hard error in IBM format and is different from the track ad- dress specified in the Command Phase D0 Missing Address Mark in Data Field Control- ler cannot find the Data Field AM during a Read Scan or Verify command Bit 0 of ST1 is also set 3104 Status Register 3 (ST3) D7 D6 D5 D4 D3 D2 D1 D0 DESC 0 WP 1 TK0 1 HDS DS1 DS0 RESET 0 0 101 0 0 0 COND D7 Not Used Always 0 D6 Write Protect Indicates active high status of the WP pin D5 Not Used Always 1 D4 Track 0 Indicates active high status of the TRK0 pin D3 Not Used Always 1 D2 Head Select Indicates the active high status of the HD bit in the Command Phase D1 – D0 Drive Select 10 These two binary encoded bits indicate the DS1 – DS0 bits in the Command Phase 14 |
Similar Part No. - PC8477BV-1 |
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Similar Description - PC8477BV-1 |
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