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FDC37C669-MT Fiches technique(PDF) 7 Page - Microchip Technology |
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FDC37C669-MT Fiches technique(HTML) 7 Page - Microchip Technology |
7 / 162 page 7 DESCRIPTION OF PIN FUNCTIONS QFP/ TQFP PIN NO. NAME SYMBOL BUFFER TYPE DESCRIPTION 19, 37-40, Interrupt Request A, C, D, E, F, IRQ_A IRQ_C IRQ_D IRQ_E IRQ_F O24 OD24 The interrupt request from the logical device or IRQIN is output on one of the IRQA-G signals. Refer to the configuration registers for more information. If EPP or ECP Mode is enabled, this output is pulsed low, then released to allow sharing of interrupts. 27 Chip Select Input nCS I When enabled, this active low pin serves as an input for an external decoder circuit which is used to qualify address lines above A10. 57 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 16 nRead 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. 10 nWrite Gate nWGATE OD48 This active low high current driver allows current to flow through the write head. It becomes active just prior to writing to the diskette. 9 nWrite Data nWDATA OD48 This active low high current driver provides the encoded data to the disk drive. Each falling edge causes a flux transition on the media. 11 nHead Select nHDSEL OD48 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. 7 Direction Control nDIR OD48 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. |
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