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PC87306 Datasheet(PDF) 52 Page - National Semiconductor (TI) |
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PC87306 Datasheet(HTML) 52 Page - National Semiconductor (TI) |
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52 / 110 page  40 FDC Command Set Description (Continued) Execution Phase Disk drive head stepped in or out a pro- grammable number of tracks Result Phase None SCAN EQUAL Command Phase MT MFM SK 1 0 0 0 1 IPS X X X X HD DR1 DR0 Track Number Drive Head Number Sector Number Bytes per Sector End of Track Sector Number Intersector Gap Length Sector Step Size Execution Phase Data transferred from system to control- ler is compared to data read from disk Result Phase MT MFM SK 1 1 1 0 1 IPS X X X X HD DR1 DR0 Status Register 0 Status Register 1 Status Register 2 Track Number Head Number Sector Number Bytes per Sector SCAN HIGH OR EQUAL Command Phase MT MFM SK 1 1 1 0 1 IPS X X X X HD DR1 DR0 Track Number Drive Head Number Sector Number Bytes per Sector End of Track Sector Number Intersector Gap Length Sector Step Size Execution Phase Data transferred from system to control- ler is compared to data read from disk Result Phase Status Register 0 Status Register 1 Status Register 2 Track Number Head Number Sector Number Bytes per Sector SCAN LOW OR EQUAL Command Phase MT MFM SK 1 1 0 0 1 IPS X X X X HD DR1 DR0 Track Number Drive Head Number Sector Number Bytes per Sector End of Track Sector Number Intersector Gap Length Sector Step Size Execution Phase Data transferred from system to control- ler is compared to data read from disk Result Phase Status Register 0 Status Register 1 Status Register 2 Track Number Head Number Sector Number Bytes per Sector SEEK Command Phase 00001111 XXXXX HD DR1 DR0 New Track Number MSN of Track Number 0000 Note The last Command Phase byte is required only if ETR is set in Mode Command Execution Phase Disk drive head is stepped in or out to a programmed track Result Phase None 52 |
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