CAT28C512(2001) Просмотр технического описания (PDF) - Catalyst Semiconductor => Onsemi

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CAT28C512
(Rev.:2001)

512K-Bit CMOS PARALLEL EEPROM

Catalyst Semiconductor => Onsemi 

CAT28C512/513

DATA Polling

DATA polling is provided to indicate the completion of

write cycle. Once a byte write or page write cycle is

initiated, attempting to read the last byte written will

output the complement of that data on I/O7 (I/O0–I/O6

are indeterminate) until the programming cycle is com-

plete. Upon completion of the self-timed write cycle, all

I/O’s will output true data during a read cycle.

Toggle Bit

In addition to the DATA Polling feature of the CAT28C512/

513, the device offers an additional method for determin-

ing the completion of a write cycle. While a write cycle is

in progress, reading data from the device will result in I/

O6 toggling between one and zero. However, once the

write is complete, I/O6 stops toggling and valid data can

be read from the device.

Figure 7. DATA Polling

ADDRESS

CE

WE

tOEH

tOE

OE

tWC

I/O7

DIN = X

DOUT = X

Figure 8. Toggle Bit

tOES

DOUT = X

28C512-513 F10

WE

CE

tOEH

tOE

OE

I/O6

(1)

Note:

(1) Beginning and ending state of I/O6 is indeterminate.

tOES

(1)

tWC

28C512-513 F11

Doc. No. 1007, Rev. A

8

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