S75WS256NDFBAWMB datasheet(39/216 Pages) SPANSION

39 / 216 page

February 17, 2005 S75WS-N-00_A0

S75WS256Nxx Based MCPs

Advance

Information

Figure 8.4 Write Buffer Programming Operation

8.5.3

Sector Erase

The sector erase function erases one or more sectors in the memory array. (See Table 13.1 and

Figure 8.5) The device does not require the system to preprogram prior to erase. The Embedded

Erase algorithm automatically programs and verifies the entire memory for an all zero data pat-

tern prior to electrical erase. After a successful sector erase, all locations within the erased sector

contain FFFFh. The system is not required to provide any controls or timings during these

operations.

After the command sequence is written, a sector erase time-out of no less than tSEA occurs. Dur-

ing the time-out period, additional sector addresses and sector erase commands may be written.

Loading the sector erase buffer may be done in any sequence, and the number of sectors may be

from one sector to all sectors. The time between these additional cycles must be less than tSEA.

Write Unlock Cycles:

Address 555h, Data AAh

Address 2AAh, Data 55h

Issue

Write Buffer Load Command:

Address 555h, Data 25h

Load Word Count to Program

Program Data to Address:

SA = wc

Unlock Cycle 1

Unlock Cycle 2

wc = number of words – 1

Yes

wc = 0?

Write Buffer

Abort Desired?

Write Buffer

Abort?

Polling Status

= Done?

Error?

FAIL. Issue reset command

to return to read array mode.

Write to a Different

Sector Address to Cause

Write Buffer Abort

PASS. Device is in

read mode.

Confirm command:

SA 29h

Wait 4

µs

Perform Polling Algorithm

(see Write Operation Status

flowchart)

Write Next Word,

Decrement wc:

data , wc = wc – 1

RESET. Issue Write Buffer

Abort Reset Command

S75WS256NDFBAWMB Datasheet(PDF) 39 Page - SPANSION

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