7/16

M29F512B

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 or Chip Erase operation fails to write the cor-

rect data to the memory. If the Error Bit is set a

Read/Reset command must be issued before oth-

er 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. The Chip Erase command must be

used to set all the bits the memory from ’0’ to ’1’.

Table 6. Status Register Bits

Note: Unspecified data bits should be ignored.

Operation

Address

DQ7

DQ6

DQ5

Program

Any Address

DQ7

Toggle

0

Program Error

Any Address

DQ7

Toggle

1

Chip Erase

Any Address

0

Toggle

0

Erase Error

Any Address

0

Toggle

1

Figure 3. Data Polling Flowchart

READ DQ5 & DQ7

at VALID ADDRESS

START

READ DQ7

FAIL

PASS

AI01369

DQ7

=

DATA

YES

NO

YES

NO

DQ5

= 1

DQ7

=

DATA

YES

NO

Figure 4. Data Toggle Flowchart

READ

DQ5 & DQ6

START

READ DQ6

FAIL

PASS

AI01370

DQ6

=

TOGGLE

NO

NO

YES

YES

DQ5

= 1

NO

YES

DQ6

=

TOGGLE