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FDC37C78-HT Datasheet(PDF) 31 Page - Microchip Technology |
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FDC37C78-HT Datasheet(HTML) 31 Page - Microchip Technology |
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31 / 82 page  31 Table 18 - Description of Command Symbols SYMBOL NAME DESCRIPTION modified if OW is set to 1. OW id defined in the Lock command. PCN Present Cylinder Number The current position of the head at the completion of Sense Interrupt Status command. POLL Polling Disable When set, the internal polling routine is disabled. When clear, polling is enabled. PRETRK Precompensation Start Track Number Programmable from track 00 to FFH. R Sector Address The sector number to be read or written. In multi-sector transfers, this parameter specifies the sector number of the first sector to be read or written. RCN Relative Cylinder Number Relative cylinder offset from present cylinder as used by the Relative Seek command. SC Number of Sectors Per Track The number of sectors per track to be initialized by the Format command. The number of sectors per track to be verified during a Verify command when EC is set. SK Skip Flag When set to 1, sectors containing a deleted data address mark will automatically be skipped during the execution of Read Data. If Read Deleted is executed, only sectors with a deleted address mark will be accessed. When set to "0", the sector is read or written the same as the read and write commands. SRT Step Rate Interval The time interval between step pulses issued by the FDC. Programmable from 0.5 to 8 milliseconds in increments of 0.5 ms at the 1 Mbit data rate. Refer to the SPECIFY command for actual delays. ST0 ST1 ST2 ST3 Status 0 Status 1 Status 2 Status 3 Registers within the FDC which store status information after a command has been executed. This status information is available to the host during the result phase after command execution. WGATE Write Gate Alters timing of WE to allow for pre-erase loads in perpendicular drives. |
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