M39832 datasheet(16/36 Pages) STMICROELECTRONICS

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READ

DQ2, DQ5 & DQ6

START

READ DQ2, DQ6

FAIL

PASS

AI01873

DQ2, DQ6

TOGGLE

YES

DQ5

= 1

YES

DQ2, DQ6

TOGGLE

Figure 7B. Flash ata Toggle Flowchart

READ

DQ5 & DQ6

START

READ DQ6

FAIL

PASS

AI01370

DQ6

TOGGLE

YES

DQ5

= 1

YES

DQ6

TOGGLE

Figure 7A. Data Toggle Flowchart

Toggle Bit, DQ2 (Flash array only). This toggle

bit, together with DQ6, can be used to determine

the device status during the Erase operations. It

can also be used to identify the block being erased.

During Erase or Erase Suspend a read from a block

being erased will cause DQ2 to toggle. A read from

a block not being erased will set DQ2 to ’1’ during

erase and to DQ2 during Erase Suspend. During

Flash Array Erase, a read operation will cause

DQ2 to toggle as all blocks are being erased. DQ2

will be set to ’1’ during program operation and when

erase is complete. After erase completion and if the

error bit DQ5 is set to ’1’, DQ2 will toggle if the faulty

block is addressed.

Error flag, DQ5 (Flash block only). This bit is set

to ’1’ by the internal logic when there is a failure of

programming, block erase, or chip erase that re-

sults in invalid data in the memory block. In case of

an error in block erase or program, the block in

which the error occured or to which the pro-

grammed data belongs, must be discarded. The

DQ5 failure condition will also appear if a user tries

to program a ’1’ to a location that is previously

programmed to ’0’. Other Blocks may still be used.

The error bit resets after a Read/Reset (RD) in-

struction. In case of success of Program or Erase,

the error bit will be set to ’0’ . when A0 is High with

A1 Low.

Erase Timer Bit, DQ3 (Flash array only). This bit

is set to ’0’ by internal logic when the last block

Erase command has been entered to the Com-

mand Interface and it is awaiting the Erase start.

When the erase timeout period is finished, after

50ms to 90ms, DQ3 returns to ’1’.

WRITE a BYTE (or a PAGE) in EEPROM

It should be noticed that writing in the EEPROM

array is an operation, it is not an instruction (as for

Programming a byte in the Flash array).

Write a Byte in EEPROM Array

A write operation is initiated when Chip Enable EE

is Low and Write Enable W is Low with Output

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M39832

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