CT24/25 V15.0

NMC27C32

Read Mode

The NMC27C32B has two control PINS, both of which must be logically active in order to obtain data at the outputs.

Chip Enable (CE) is the power control and should be used for device selection.

Output Enable (OE) is the output control and should be used to gate data to the output pins, independent of device selection.

Data is available at the outputs tOE after the falling edge of OE, assuming that CE has been low and addresses have been stable for at least tACC– tOE.

Read flow NMC27C32B 32,768-Bit (4096 x 8) CMOS EPROM

initial set up

both CE( pin 18) and OE (pin 20) are high

Read loop

Set up address on address bus
send CE low
send OE low
wait
read data bus
set CE high
set OE high

pin mapper to read with Mega

check sums

bd69c1fecb17284f52b91d0913c27afd ic7megaread3.BIN

bd69c1fecb17284f52b91d0913c27afd CT24_25_ISSV15_IC7.BIN

1ca75cc254b6cd45e563771ea94b860b CT24_25_ISSV15_IC6.BIN

090df751437607f9ce033e177a531ab0 CT24_25_ISSV15_IC5.BIN

c9992e65a9656d7a556e78f822881d9a CT24_25_ISSV15_IC4.BIN

497a81248942a5c622bee72a4e1901e4 CT24_25_ISSV15_IC3.BIN

491c0dbab72b0203da4579786ace9e0a CT24_25_ISSV15_IC2.BIN

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