SST26VF032BEUI datasheet(29/76 Pages) MICROCHIP

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DS20006152A-page 29

SST26VF032BEUI

5.24

Write Suspend During Page

Programming or SPI Quad Page

Programming

Issuing a Write-Suspend instruction during Page Pro-

gramming allows the host to erase or read any sector

that is not being programmed. Erase commands point-

ing to the suspended sector(s) will be ignored. Any

attempt to read from the suspended page will output

unknown data because the program will be incomplete.

To execute a Write Suspend operation, the host drives

CE# low, sends the Write Suspend command cycle

(B0H), then drives CE# high. The Status register indi-

cates that the programming has been suspended by

changing the WSP bit from ‘0’ to ‘1,’ but the device will

not accept another command until it is ready. To deter-

mine when the device will accept a new command, poll

the BUSY bit in the Status register or wait TWS.

5.25

Write-Resume

Write-Resume restarts a Write command that was sus-

pended, and changes the suspend status bit in the Sta-

tus register (WSE or WSP) back to ‘0’.

To execute a Write-Resume operation, the host drives

CE# low, sends the Write Resume command cycle

(30H), then drives CE# high. To determine if the inter-

nal, self-timed Write operation completed, poll the

BUSY bit in the Status register, or wait the specified

time TSE, TBE or TPP for Sector-Erase, Block-Erase, or

Page-Programming, respectively. The total write time

before suspend and after resume will not exceed the

uninterrupted write times TSE, TBE or TPP.

5.26

Read Security ID

The Read Security ID operation is supported in both

SPI and SQI modes. To execute a Read Security ID

(SID) operation in SPI mode, the host drives CE# low,

sends the Read Security ID command cycle (88H), two

address cycles, and then one dummy cycle. To execute

a Read Security ID operation in SQI mode, the host

drives CE# low and then sends the Read Security ID

command, two address cycles, and three dummy

cycles.

After the dummy cycles, the device outputs data on the

falling edge of the SCK signal, starting from the speci-

fied address location. The data output stream is contin-

uous through all SID addresses until terminated by a

low-to-high transition on CE#. See Table 5-5 for the

Security ID address range.

5.27

Program Security ID

The Program Security ID instruction programs one to

2040 Bytes of data in the user-programmable, Security

ID space. This Security ID space is one-time program-

mable (OTP). The device ignores a Program Security

ID instruction pointing to an invalid or protected

address, see Table 5-5. Prior to the program operation,

execute WREN.

To execute a Program SID operation, the host drives

CE# low, sends the Program Security ID command

cycle (A5H), two address cycles, the data to be pro-

grammed, then drives CE# high. The programmed data

must be between 1 to 256 Bytes and in whole Byte

increments.

The device handles shifting of more than 256 Bytes of

data by maintaining the last 256 Bytes of data as the

correct data to be programmed. If the target address for

the Program Security ID instruction is not the beginning

of the page boundary, and the number of data input

exceeds or overlaps the end of the address of the page

boundary, the excess data inputs wrap around and will

be programmed at the start of that target page.

The Program Security ID operation is supported in both

SPI and SQI mode. To determine the completion of the

internal, self-timed Program SID operation, poll the

BUSY bit in the software status register, or wait TPSID

for the completion of the internal self-timed Program

Security ID operation.

TABLE 5-5:

PROGRAM SECURITY ID

Program Security ID

Address Range

Unique ID Pre-Programmed at factory

0000 – 0007H

User Programmable

0008H – 07FFH

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