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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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PC87311 датащи(PDF) 30 Page - National Semiconductor (TI) |
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PC87311 датащи(HTML) 30 Page - National Semiconductor (TI) |
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30 / 78 page  40 FDC Command Set Description (Continued) To allow for flexible formatting the mP must supply the four Address Field bytes (track head sector bytes per sector code) for each sector formatted during the Execution Phase This allows for non-sequential sector interleaving This transfer of bytes from the mP to the controller can be done in the DMA or Non-DMA mode with the FIFO enabled or disabled The Format command terminates when the index hole is detected a second time at which point an interrupt is gener- ated Only the first three status bytes in the Result Phase are significant The Format Gap byte in the Command Phase is dependent on the data rate and type of disk drive and will control the length of GAP3 Some typical values for the programmable GAP3 are given in Table 4-1 (next page) Figure 4-1 shows the track format for the three types of formats supported by the floppy controller TLF11362 – 5 Notes FE e Data Pattern of FE Clock Pattern of C7 FC e Data Pattern of FC Clock Pattern of D7 FB e Data Pattern of FB Clock Pattern of C7 F8 e Data Pattern of F8 Clock Pattern of C7 A1 e Data Pattern of A1 Clock Pattern of 0A C2 e Data Pattern of C2 Clock Pattern of 14 All byte counts in decimal All byte values in hex CRC uses standard polynomial x16 a x12 a x5 a 1 Perpendicular Format GAP2 e 41 bytes for 1 Mbs All other data rates use GAP2 e 22 bytes FM mode is not guaranteed through functional testing FIGURE 4-1 IBM Perpendicular and ISO Formats Supported by Format Command 30 |
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