S29CD032J datasheet(32/81 Pages) SPANSION

32 / 81 page

S29CD-J and S29CL-J Flash Family

S29CD-J_CL-J_00_B7 October 11, 2012

Da ta

Sh e e t

8.7.1

Programming

Programming is a four-bus-cycle operation. The program command sequence is initiated by writing two

unlock write cycles, followed by the program setup command. The program address and data are written

next, which in turn initiate the Embedded Program algorithm. The system is not required to provide further

controls or timings. The device automatically generates the program pulses and verifies the programmed cell

margin. Command Definitions on page 75 shows the address and data requirements for the program

command sequence.

Note the following:

 When the Embedded Program algorithm is complete, the device returns to the read mode and address are

no longer latched. An address change is required to begin reading valid array data.

 The system can determine the status of the program operation by using DQ7, DQ6 or RY/BY#. Refer to

Write Operation Status on page 36 for information on these status bits.

 A “0” cannot be programmed back to a “1.” Attempting to do so may halt the operation and set DQ5 to 1, or

cause the Data# Polling algorithm to indicate the operation was successful. A succeeding read shows that

the data is still “0.” Only erase operations can convert a “0” to a “1.”

 Any commands written to the device during the Embedded Program Algorithm are ignored except the

Program Suspend command.

 A hardware reset immediately terminates the program operation; the program command sequence should

be re-initiated once the device has returned to the read mode, to ensure data integrity.

 For the 32Mb S29CD-J and S29CL-J devices only:

Please refer to the application note “Recommended Mode of Operation for Spansion® 110 nm

S29CD032J/S29CL032J Flash Memory” publication number S29CD-CL032J_Recommend_AN for

programming best practices.

Figure 8.5 Program Operation

Note

See Table 19.1 and Table 20.2 for program command sequence.

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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