PC87332 datasheet(16/98 Pages) NSC

номер детали	PC87332

подробное описание детали	PC87332VLJ (3.3V/5V) and PC87332VLJ-5 (5V) (SuperI/OTM III Premium Green) Floppy Disk Controller, Dual UARTs, IEEE1284 Parallel Port, and IDE Interfac

PDF	98 Pages

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производитель	NSC [National Semiconductor (TI)]

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10 Pin Description (Continued)

Symbol

Function

Normal

Write Protect

This input indicates that the floppy disk in the selected drive is write protected

Mode

PPM

Write Protect

This pin provides an additional Write Protect signal in PPM Mode when PNF e 0 (See

PD2 and Table 7-5 for further information)

Mode

WRITE

Write Strobe

This signal is used in EPP mode as a write strobe It is active low (See STB and Table 7-5

for further information)

X1OSC

Crystal1Clock

One side of an external 24 MHz48 MHz crystal is attached here The other side of the

crystal is connected to X2 If a crystal is not used a TTL or CMOS compatible clock is connected to this

Crystal2

One side of an external 24 MHz48 MHz crystal is attached here The other side of the crystal is

connected to X1OSC This pin is left unconnected if an external clock is used

ZWS

Zero Wait State

This pin is the Zero Wait State open drain output pin when bit 6 of FCR is 0 ZWS is

driven low when the EPP or ECP is written and the access can be shortened This pin is PWDN when bit 6

of FCR is 1 (See the PWDN pin for further information)

PC87332 датащи(PDF) 16 Page - National Semiconductor (TI)