FDC37C78-HT Microchip

FDC37C78 Floppy Disk Controller FEATURES 3.3/5 Volt Operation - Swap Drives A and B Intelligent Auto Power Management - Non-Burst Mode DMA Option 2.88MB FDC37C78 Floppy Disk Controller - Detects All Overrun and Underrun - Licensed CMOS 765B Floppy Disk Conditions Controller - Sophisticated Power Control Circuitry - Software and Register Compatible with (PCC) Including Multiple Powerdown SMSC s Proprietary 82077AA Modes for Reduced Power Compatible Core Consumption - Supports Two Floppy Drives Directly Enhanced Digital Data Separator - Supports Vertical Recording Format - 2 Mbps (Only Available When V = 5V), CC - 16 Byte Data FIFO 1 Mbps, 500 Kbps, 300 Kbps, 250 Kbps - 100% IBM Compatibility Data Rates - DMA Enable Logic - Programmable Precompensation Modes - Data Rate and Drive Control Registers 48 pin TQFP Package TABLE OF CONTENTS FEATURES...............................................................................................................................................1 GENERAL DESCRIPTION .......................................................................................................................3 PIN CONFIGURATION.............................................................................................................................4 DESCRIPTION OF PIN FUNCTIONS ......................................................................................................6 FUNCTIONAL DESCRIPTION ...............................................................................................................10 FDC37C78 REGISTERS ..................................................................................................................10 HOST PROCESSOR INTERFACE ..................................................................................................10 FLOPPY DISK CONTROLLER .........................................................................................................11 FLOPPY DISK CONTROLLER INTERNAL REGISTERS.................................................................11 COMMAND SET/DESCRIPTIONS .........................................................................................................29 INSTRUCTION SET ...............................................................................................................................32 AUTO POWER MANAGEMENT.............................................................................................................58 CONFIGURATION..................................................................................................................................62 OPERATIONAL DESCRIPTION.............................................................................................................71 MAXIMUM GUARANTEED RATINGS..............................................................................................71 DC ELECTRICAL CHARACTERISTICS...........................................................................................71 TIMING DIAGRAMS ...............................................................................................................................75 2