S70FS01GS datasheet(95/141 Pages) CYPRESS

95 / 141 page

S70FS01GS

Document Number: 002-03833 Rev. *C

Page 95 of 141

9.5

Program Flash Array Commands

9.5.1

Program Granularity

9.5.1.1

Automatic ECC

Each 16 byte aligned and 16 byte length Programming Block has a hidden Error Correction Code (ECC) value. The data block plus

ECC form an ECC unit. In combination with Error Detection and Correction (EDC) logic the ECC is used to detect and correct any

single bit error found during a read access. When data is first programmed within an ECC unit the ECC value is set for the entire

ECC unit. If the same ECC unit is programmed more than once the ECC value is changed to disable the EDC function. A sector

erase is needed to again enable Automatic ECC on that Programming Block. The 16 byte Program Block is the smallest program

granularity on which Automatic ECC is enabled.

These are automatic operations transparent to the user. The transparency of the Automatic ECC feature enhances data accuracy

for typical programming operations which write data once to each ECC unit but, facilitates software compatibility to previous

generations of FL family of products by still allowing for single byte programming and bit walking in which the same ECC unit is

programmed more than once. When an ECC unit has Automatic ECC disabled, EDC is not done on data read from the ECC unit

location.

An ECC status register is provided for determining if ECC is enabled on an ECC unit and whether any errors have been detected

and corrected in the ECC unit data or the ECC. The ECC Status Register Read (ECCRD) command is used to read the ECC status

on any ECC unit.

9.5.1.2

Page Programming

Page Programming is done by loading a Page Buffer with data to be programmed and issuing a programming command to move

data from the buffer to the memory array. This sets an upper limit on the amount of data that can be programmed with a single

programming command. Page Programming allows up to a page size (either 256 or 512 bytes) to be programmed in one operation.

The page size is determined by the configuration register bit CR3V[4].The page is aligned on the page size address boundary. It is

possible to program from one bit up to a page size in each Page programming operation. It is recommended that a multiple of 16

byte length and aligned Program Blocks be written. This insures that Automatic ECC is not disabled. For the very best performance,

programming should be done in full pages of 512 bytes aligned on 512 byte boundaries with each Page being programmed only

once.

9.5.1.3

Single Byte Programming

Single Byte Programming allows full backward compatibility to the legacy standard SPI Page Programming (PP) command by

allowing a single byte to be programmed anywhere in the memory array. While single byte programming is supported, this will

disable Automatic ECC on the 16 byte ECC unit where the byte is located.

9.5.2

Page Program (PP 02h or 4PP 12h)

The Page Program (PP) command allows bytes to be programmed in the memory (changing bits from 1 to 0). Before the Page

Program (PP) commands can be accepted by the device, a Write Enable (WREN) command must be issued and decoded by the

device. After the Write Enable (WREN) command has been decoded successfully, the device sets the Write Enable Latch (WEL) in

the Status Register to enable any write operations.

The instruction



02h (CR2V[7]=0) is followed by a 3-byte address (A23-A0) or



02h (CR2V[7]=1) is followed by a 4-byte address (A31-A0) or



12h is followed by a 4-byte address (A31-A0)

and at least one data byte on SI. Depending on CR3V[4], the page size can either be 256 or 512 Bytes. Up to a page can be

provided on SI after the 3-byte address with instruction 02h or 4-byte address with instruction 12h has been provided.

If more data is sent to the device than the space between the starting address and the page aligned end boundary, the data loading

sequence will wrap from the last byte in the page to the zero byte location of the same page and begin overwriting any data

previously loaded in the page. The last page worth of data is programmed in the page. This is a result of the device being equipped

with a page program buffer that is only page size in length. If less than a page of data is sent to the device, these data bytes will be

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