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FDC37B777 Datasheet(PDF) 37 Page - SMSC Corporation |
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FDC37B777 Datasheet(HTML) 37 Page - SMSC Corporation |
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37 / 196 page  37 N SECTOR SIZE 00 01 02 03 .. 07 128 bytes 256 bytes 512 bytes 1024 bytes ... 16 Kbytes Table 17 - Description of Command Symbols SYMBOL NAME DESCRIPTION GAP Alters Gap 2 length when using Perpendicular Mode. GPL Gap Length The Gap 3 size. (Gap 3 is the space between sectors excluding the VCO synchronization field). H/HDS Head Address Selected head: 0 or 1 (disk side 0 or 1) as encoded in the sector ID 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" hex are allowable. "07"h would equal a sector size of 16k. It is the user's responsibility to not select combinations that are not possible with the drive. |
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