AM29PL320D datasheet(23/50 Pages) SPANSION

23 / 50 page

October 2, 2003

Am29PL320D

Unlock Bypass Command Sequence

The unlock bypass feature allows the system to pro-

gram bytes or words to the device faster than using the

standard program command sequence. The unlock by-

pass command sequence is initiated by first writing

two unlock cycles. This is followed by a third write cycle

containing the unlock bypass command, 20h. The de-

vice then enters the unlock bypass mode. A two-cycle

unlock bypass program command sequence is all that

is required to program in this mode. The first cycle in

this sequence contains the unlock bypass program

command, A0h; the second cycle contains the pro-

g r am addres s and data. Addit i onal data is

programmed in the same manner. This mode dis-

penses with the initial two unlock cycles required in the

standard program command sequence, resulting in

faster total programming time. Table 13 shows the re-

quirements for the command sequence.

During the unlock bypass mode, only the Unlock By-

pass Program and Unlock Bypass Reset commands

are valid. To exit the unlock bypass mode, the system

must issue the two-cycle unlock bypass reset com-

mand sequence. The first cycle must contain the data

90h; the second cycle the data 00h. Addresses are

don’t care for both cycles. The device then returns to

reading array data.

Figure 2 illustrates the algorithm for the program oper-

ation. See the Program/Erase Operations table in “AC

Characteristics” for parameters, and to Figure 17 for

timing diagrams.

Note: See Table 13 for program command sequence.

Figure 2.

Program Operation

START

Write Program

Command Sequence

Data Poll

from System

Verify Data?

Yes

Last Address?

Yes

Programming

Completed

Increment Address

Embedded

Program

algorithm

in progress

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