M29F800AT90N3T datasheet(10/21 Pages) STMICROELECTRONICS

10 / 21 page

M29F800AT, M29F800AB

10/21

Figure 3. Data Polling Flowchart

READ DQ5 & DQ7

at VALID ADDRESS

START

READ DQ7

FAIL

PASS

AI01369

DQ7

DATA

YES

DQ5

DQ7

DATA

YES

Figure 4. Data Toggle Flowchart

READ

DQ5 & DQ6

START

READ DQ6

FAIL

PASS

AI01370

DQ6

TOGGLE

YES

DQ5

YES

DQ6

TOGGLE

Toggle Bit (DQ6). The Toggle Bit can be used to

identify whether the Program/Erase Controller has

successfully completed its operation or if it has re-

sponded to an Erase Suspend. The Toggle Bit is

output on DQ6 when the Status Register is read.

During Program and Erase operations the Toggle

Bit changes from ’0’ to ’1’ to ’0’, etc., with succes-

sive Bus Read operations at any address. After

successful completion of the operation the memo-

ry returns to Read mode.

During Erase Suspend mode the Toggle Bit will

output when addressing a cell within a block being

erased. The Toggle Bit will stop toggling when the

Program/Erase Controller has suspended the

Erase operation.

Figure 4, Data Toggle Flowchart, gives an exam-

ple of how to use the Data Toggle Bit.

Error Bit (DQ5). The Error Bit can be used to

identify errors detected by the Program/Erase

Controller. The Error Bit is set to ’1’ when a Pro-

gram, Block Erase or Chip Erase operation fails to

write the correct data to the memory. If the Error

Bit is set a Read/Reset command must be issued

before other commands are issued. The Error bit

is output on DQ5 when the Status Register is read.

Note that the Program command cannot change a

bit set at ’0’ back to ’1’ and attempting to do so will

cause an error. One of the Erase Commands must

be used to set all the bits in a block or in the whole

memory from ’0’ to ’1’.

Erase Timer Bit (DQ3). The Erase Timer Bit can

be used to identify the start of Program/Erase

Controller operation during a Block Erase com-

mand. Once the Program/Erase Controller starts

erasing the Erase Timer Bit is set to ’1’. Before the

Program/Erase Controller starts the Erase Timer

Bit is set to ’0’ and additional blocks to be erased

may be written to the Command Interface. The

Erase Timer Bit is output on DQ3 when the Status

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