S29GL01GS10DFIV13 datasheet(23/108 Pages) CYPRESS

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Document Number: 001-98285 Rev. *R

Page 23 of 108

S29GL01GS/S29GL512S

S29GL256S/S29GL128S

5.4

Command Set

5.4.1

Program Methods

5.4.1.1

Word Programming

Word programming is used to program a single word anywhere in the main Flash Memory Array.

The Word Programming command is a four-write-cycle sequence. The program command sequence is initiated by writing two

unlock write cycles, followed by the program set up command. The program address and data are written next, which in turn initiate

the Embedded Word Program algorithm. The system is not required to provide further controls or timing. The device automatically

generates the program pulses and verifies the programmed cell margin internally. When the Embedded Word Program algorithm is

complete, the EAC then returns to its standby mode.

The system can determine the status of the program operation by using Data Polling Status, reading the Status Register, or

monitoring the RY/BY# output. See Status Register on page 34 for information on these status bits. See Data Polling Status

on page 35 for information on these status bits. See Figure 5.1 on page 23 for a diagram of the programming operation.

Any commands other than Program Suspend written to the device during the Embedded Program algorithm are ignored. Note that a

hardware reset (RESET# = VIL) immediately terminates the programming operation and returns the device to read mode after tRPH

time. To ensure data integrity, the Program command sequence should be reinitiated once the device has completed the hardware

reset operation.

A modified version of the Word Programming command, without unlock write cycles, is used for programming when entered into the

Lock Register, Password, and PPB ASOs. The same command is used to change volatile bits when entered in to the PPB Lock, and

DYB ASOs. See Table7.1 onpage55 for program command sequences.

Figure 5.1 Word Program Operation

START

Write Program Command

Sequence

Data Poll from System

Verify Word?

Last Addresss?

Increment Address

Embedded

Program

algorithm

in progress

Programming Completed

Yes

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