S75WS256NDFBAWMB datasheet(117/216 Pages) SPANSION

117 / 216 page

February 17, 2005 S75WS-N-00_00_A0

S75WS256Nxx Based MCPs

115

Data

Sheet

The system must write the reset command to return to the read mode (or erase-suspend-read

mode if the device was previously in Erase Suspend).

19.7 Program Command Sequence

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

ing 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 Program algorithm. The system is not

required to provide further controls or timings. The device automatically provides internally gen-

erated program pulses and verifies the programmed cell margin. The Command Definitions table

shows the address and data requirements for the program command sequence.

When the Embedded Program algorithm is complete, the device then returns to the read mode

and addresses are no longer latched. The system can determine the status of the program oper-

ation by monitoring DQ7 or DQ6/DQ2. Refer to the “Write Operation Status” section for

information on these status bits.

Any commands written to the device during the Embedded Program Algorithm are ignored. Note

that a hardware reset immediately terminates the program operation. The program command se-

quence should be reinitiated once the device has returned to the read mode, to ensure data

integrity.

Programming is allowed in any sequence and across sector boundaries. A bit cannot be pro-

grammed from 0 back to a 1. Only erase operations can convert a 0 back to a 1.

Attempting to program a 1 over a 0 will result in a programming failure.

Note: See the Command Definitions table for program command sequence.

Figure 19.2 Program Word Operation

19.8 Write Buffer Programming Command Sequence

Write Buffer Programming Sequence allows for faster programming as compared to the standard

Program Command Sequence. See the Write Buffer Programming Operation section for the pro-

gram command sequence.

Table 19.11 Write Buffer Command Sequence

Sequence

Address

Data

Comment

Unlock Command 1

555

00AA

Not required in the Unlock Bypass mode

Unlock Command 2

2AA

0055

Same as above

Write Buffer Load

Sector Address

0025h

Specify the Number of Program

Locations

Starting Address

Word Count

Number of locations to program minus 1

Load 1st data word

Starting Address

Program Data

All addresses must be within write-buffer-

page boundaries, but do not have to be

loaded in any order

Load next data word

Write Buffer Location Program Data Same as above

...

Same as above

Load last data word

Write Buffer Location Program Data Same as above

Write Buffer Program Confirm

Sector Address

0029h

This command must follow the last write

buffer location loaded, or the operation will

ABORT

Device goes busy

Status monitoring through DQ pins

(Perform Data Bar Polling on the Last

Loaded Address)

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