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CHAPTER 9 WRITING TO AND VERIFYING PROGRAM MEMORY (PROM)
The timing for steps (2) to (12) is shown below.
V
PP
V
DD
V
PP
V
DD +1
V
DD
V
DD
X1
P40-P43
P50-P53
MD0
(P30)
MD1
(P31)
MD2
(P32)
MD3
(P33)
Data input
Data output
Data input
Write
Verify
Additional write
Address
increment
Repeat x times
