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FDC37C78-HT Datasheet(PDF) 7 Page - Microchip Technology |
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FDC37C78-HT Datasheet(HTML) 7 Page - Microchip Technology |
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7 / 82 page  7 DESCRIPTION OF PIN FUNCTIONS PIN NO. NAME SYMBOL BUFFER TYPE DESCRIPTION 38 Reset RESET IS This active high signal resets the chip and must be valid for 500 ns minimum. The effect on the internal registers is described in the appropriate section. The configuration registers are not affected by this reset. FLOPPY DISK INTERFACE 21 Read Disk Data nRDATA IS Raw serial bit stream from the disk drive, low active. Each falling edge represents a flux transition of the encoded data. 27 Write Data nWDATA OD20 This active low high current driver provides the encoded data to the disk drive. Each falling edge causes a flux transition on the media. 29 Head Select nHDSEL OD20 This high current output selects the floppy disk side for reading or writing. A logic "1" on this pin means side 0 will be accessed, while a logic "0" means side 1 will be accessed. 33 Direction Control nDIR OD20 This high current low active output determines the direction of the head movement. A logic "1" on this pin means outward motion, while a logic "0" means inward motion. 31 Step Pulse nSTEP OD20 This active low high current driver issues a low pulse for each track-to-track movement of the head. 20 Disk Change nDSKCHG IS This input senses that the drive door is open or that the diskette has possibly been changed since the last drive selection. This input is inverted and read via bit 7 of I/O address 3F7H. 22, 23 DRVDEN 0, DRVDEN 1 DRVDEN0, DRVDEN1 OD20 Indicates the drive and media selected. Refer to configuration registers CR03, CR0B, CR1F. 24 Density Select DENSEL OD20 Indicates whether a low (250/300 Kb/s) or high (500 Kb/s) data rate has been selected. This is determined by the IDENT bit in Configuration Register 3. |
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