Device description

M27V160

10/26

2.6

Presto III programming algorithm

The Presto III Programming Algorithm allows the whole array to be programed with a

guaranteed margin in a typical time of 52.5 seconds. Programming with Presto III consists of

applying a sequence of 50µs program pulses to each word until a correct Verify occurs (see

Figure 5.).

During programing and verify operation a Margin Mode circuit is automatically activated to

guarantee that each cell is programed with enough margin. No overprogram pulse is applied

margin to each programmed cell.

Figure 5.

Programming Flowchart

2.7

Program Inhibit

Programming of multiple M27V160s in parallel with different data is also easily

accomplished. Except for E, all like inputs including G of the parallel M27V160 may be

program that M27V160. A high level E input inhibits the other M27V160s from being

programmed.

2.8

Program Verify

A verify (read) should be performed on the programmed bits to determine that they were

AI00901B

n = 0

Last

Addr

VERIFY

E = 50

µs Pulse

++n

= 25

++ Addr

VCC = 6.25V, VPP = 12.5V

FAIL

CHECK ALL WORDS

BYTEVPP =VIH

1st: VCC = 5V

2nd: VCC = 3V

YES

NO

YES

NO

YES

NO