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L6203

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File Size : 116 KB Manufacturer:ST Description:This controller is a full featured floppy disk controller that is software compatible with the mPD765A but also includes many additional hardware and software enhancements These enhancements include additional logic specifically re- quired for an IBM PC PC-XT PC-AT or PS 2 design This controller incorporates a precision analog data separa- tor that includes a self trimming delay line and VCO Up to three external filters are switched automatically depending on the data rate selected This provides optimal perform- ance at the standard PC data rates of 250 300 kb s and 500 kb s It also enables optimum performance at 1 Mb s (MFM) These features combine to provide the lowest possi- ble PLL bandwidth with the greatest lock range and hence the widest window margin This controller includes write precompensation circuitry A shift register is used to provide a fixed 125 ns early-late precompensation for all tracks at 500k 300k 250 kb s (83 ns for 1 MB s) or a precompensation value that scales with (Continued)