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FDC37C666GT Scheda tecnica(PDF) 7 Page - SMSC Corporation |
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FDC37C666GT Scheda tecnica(HTML) 7 Page - SMSC Corporation |
7 / 152 page 7 DESCRIPTION OF PIN FUNCTIONS PIN NO. NAME SYMBOL BUFFER TYPE DESCRIPTION 39 Parallel Port Interrupt Request 1 PINTR1 O24 OD24 This interrupt from the Parallel Port is enabled/disabled via bit 4 of the Parallel Port Control Register. Refer to configuration registers CR1 and CR3 for more information. If EPP or ECP Mode is enabled, this output is pulsed low, then released to allow sharing of interrupts. 57 Reset RST IS This active high signal resets the FDC37C665GT 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. In the FDC37C666GT, the falling edge of reset latches the jumper configuration. The jumper select lines must be valid 50 ns prior to this edge. 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 ac- cessed. |
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