S29GL01GT datasheet(21/105 Pages) CYPRESS

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Document Number: 002-00247 Rev. *G

Page 21 of 105

S29GL01GT, S29GL512T

5.3

Automatic ECC

5.3.1

ECC Overview

The Automatic ECC feature works transparently with normal program, erase, and read operations. As the device transfers each

Page of data from the Write Buffer to the memory array, internal ECC logic programs ECC Code for the Page into a portion of the

memory array that is not visible to the host system. The device evaluates the Page data and the ECC Code during each initial Page

access. If needed, the internal ECC logic will correct a one bit error during the initial access.

Programming more than once to a particular Page will disable the ECC function for that Page. The ECC function will remain disabled

for that Page until the next time the host system erases the Sector containing that Page. The host system may read data stored in

that Page following multiple programming operations; however, ECC is disabled and an error in that Page will not be detected or

corrected.

5.3.2

Program and Erase Summary

For performance and reliability reasons, reading and programming operations are performed on full 32-byte Pages in parallel. The

device provides ECC on each Page by adding an ECC Code to each Page when first programmed. The ECC Code is automatic and

transparent to the host system.

5.3.3

ECC Implementation

Each 32-byte Page in the main flash array, as well as each 32-byte OTP region, features an associated ECC Code. Internal ECC

logic is able to detect and correct any single bit error found in a Page, or the associated ECC Code, during a read access.

The first Write Buffer program operation applied to a Page programs the ECC Code for that Page. Subsequent programming

operations, that occur more than once, on a particular Page disable the ECC function for that Page. This allows bit or word

programming; however, note that multiple programming operations to the same Page will disable the ECC function on the Page

where incremental programming occurs. An erase of the Sector containing a Page with ECC disabled will re-enable the ECC

function for that Page.

The ECC function is automatic and transparent to the user. The transparency of the Automatic ECC function enhances data integrity

for typical programming operations that write data once to each Page. The ECC function also facilitates software compatibility to

previous generations of GL Family products by allowing single word programming and bit walking where the same Page or word is

programmed more than once. When a Page has Automatic ECC disabled, the ECC function will not detect or correct an error on a

data read from that Page.

5.3.4

Word Programming

Word programming programs a single word anywhere in the main Flash Memory Array. Programming multiple words in the same

32-byte Page disables Automatic ECC protection on that Page. A sector erase of the sector containing that Page will re-enable

Automatic ECC following multiple word programming operations on that Page.

5.3.5

Write Buffer Programming

Each Write Buffer Program operation allows for programming of 1 bit up to 512 bytes. A 32-byte Page is the smallest program

granularity that features Automatic ECC protection. Programming the same Page more than once will disable the Automatic ECC

function on that Page. Cypress recommends that a Write Buffer programming operation program multiple Pages in an operation and

write each Page only once. This keeps the Automatic ECC protection enabled on each Page. For the very best performance,

program in full Lines of 512 bytes aligned on 512-byte boundaries.

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