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FDC37C78-HT Datasheet(PDF) 30 Page - Microchip Technology |
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FDC37C78-HT Datasheet(HTML) 30 Page - Microchip Technology |
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30 / 82 page  30 Table 18 - Description of Command Symbols SYMBOL NAME DESCRIPTION field. HLT Head Load Time The time interval that FDC waits after loading the head and before initializing a read or write operation. Refer to the Specify command for actual delays. HUT Head Unload Time The time interval from the end of the execution phase (of a read or write command) until the head is unloaded. Refer to the Specify command for actual delays. LOCK Lock defines whether EFIFO, FIFOTHR, and PRETRK parameters of the CONFIGURE COMMAND can be reset to their default values by a "software Reset". (A reset caused by writing to the appropriate bits of either tha DSR or DOR) MFM MFM/FM Mode Selector A one selects the double density (MFM) mode. A zero selects single density (FM) mode. MT Multi-Track Selector When set, this flag selects the multi-track operating mode. In this mode, the FDC treats a complete cylinder under head 0 and 1 as a single track. The FDC operates as this expanded track started at the first sector under head 0 and ended at the last sector under head 1. With this flag set, a multitrack read or write operation will automatically continue to the first sector under head 1 when the FDC finishes operating on the last sector under head 0. N Sector Size Code This specifies the number of bytes in a sector. If this parameter is “00”, then the sector size is 128 bytes. The number of bytes transferred is determined by the DTL parameter. Otherwise the sector size is (2 raised to the “N’th” power) times 128. All values up to “07” hes are allowable. “07”H would equal a sector size of 16k. It is the user’s resposibility to not select combinations that are not possible with the drive. N SECTOR SIZE 00 128 bytes 01 256 bytes 02 512 bytes 03 1024 bytes .. ... 07 16 Kbytes NCN New Cylinder Number The desired cylinder number. ND Non-DMA Mode Flag When set to 1, indicates that the FDC is to operate in the non-DMA mode. In this mode, the host is interrupted for each data transfer. When set to 0, the FDC operates in DMA mode, interfacing to a DMA controller by means of the DRQ and DACK signals. OW Overwrite The bits D0-D3 of the Perpendicular Mode Command can only be |
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