S29CD032G datasheet(49/93 Pages) SPANSION

49 / 93 page

March 22, 2004 30606B0

S29CD032G

Ad va nc e

In forma t i o n

cycle contains the program address and data. Additional data is programmed in

the same manner. This mode dispenses with the initial two unlock cycles required

in the standard program command sequence, resulting in faster total program-

ming time. Tables 18 and 20 show the requirements for the command sequence.

During the unlock bypass mode, only the Unlock Bypass Program and Unlock By-

pass Reset commands are valid. To exit the unlock bypass mode, the system

must issue the two-cycle unlock bypass reset command 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 4 illustrates the algorithm for the program operation. See the Erase/Pro-

gram Operations table in AC Characteristics for parameters, and to Figures 21

and 22 for timing diagrams.

Unlock Bypass Entry Command

The Unlock Bypass command, once issued, is used to bypass the “unlock” se-

quence for program, chip erase, and CFI commands. This feature permits slow

PROM programmers to significantly improve programming/erase throughput

since the command sequence often requires microseconds to execute a single

write operation. Therefore, once the Unlock Bypass command is issued, only the

two-cycle program and erase bypass commands are required. The Unlock Bypass

Command is ignored if the SecSi sector is enabled. To return back to normal op-

eration, the Unlock Bypass Reset Command must be issued.

START

Write Program

Command Sequence

Data Poll

from System

Verify Data?

Yes

Last Address?

Yes

Programming

Completed

Increment Address

Embedded

Program

algorithm

in progress

Note: See Tables 19 and 20 for program command sequence.

Figure 4. Program Operation

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