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FDC37C78-HT Datasheet(PDF) 11 Page - Microchip Technology |
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FDC37C78-HT Datasheet(HTML) 11 Page - Microchip Technology |
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11 / 82 page  11 FLOPPY DISK CONTROLLER The Floppy Disk Controller (FDC) provides the interface between a host microprocessor and the floppy disk drives. The FDC integrates the functions of the Formatter/Controller, Digital Data Separator, Write Precompensation and Data Rate Selection logic for an IBM XT/AT compatible FDC. The true CMOS 765B core guarantees 100% IBM PC XT/AT compatibility in addition to providing data overflow and underflow protection. The FDC37C78 is compatible to the 82077AA using SMSC's proprietary floppy disk controller core. FLOPPY DISK CONTROLLER INTERNAL REGISTERS The Floppy Disk Controller contains eight internal registers which facilitate the interfacing between the host microprocessor and the disk drive. Table 2 shows the addresses required to access these registers. Registers other than the ones shown are not supported. The rest of the FDC description assumes the Base I/O Address is 3F0. Table 2 - Status, Data and Control Registers BASE I/O ADDRESS REGISTER +0 +1 +2 +3 +4 +4 +5 +6 +7 +7 R/W R/W R W R/W R W Reserved Reserved Digital Output Register Tape Drive Register Main Status Register Data Rate Select Register Data (FIFO) Reserved Digital Input Register Configuration Control Register DOR TSR MSR DSR FIFO DIR CCR |
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