m29f016d STMicroelectronics, m29f016d Datasheet - Page 14

• Manufacturer Part Number: m29f016d
• Description: 16 Mbit 2mb X8, Uniform Block 5v Supply Flash Memory
• Manufacturer: STMicroelectronics

M29F016D
Alternative Toggle Bit (DQ2). The
Toggle Bit can be used to monitor the Program/
Erase controller during Erase operations. The Al-
ternative Toggle Bit is output on DQ2 when the
Status Register is read.
During Chip Erase and Block Erase operations the
Toggle Bit changes from ’0’ to ’1’ to ’0’, etc., with
successive Bus Read operations from addresses
within the blocks being erased. A protected block
is treated the same as a block not being erased.
Once the operation completes the memory returns
to Read mode.
During Erase Suspend the Alternative Toggle Bit
changes from ’0’ to ’1’ to ’0’, etc. with successive
Table 5. Status Register Bits
Note: Unspecified data bits should be ignored.
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Program
Program During Erase
Suspend
Program Error
Chip Erase
Block Erase before
timeout
Block Erase
Erase Suspend
Erase Error
Operation
Faulty Block Address
Good Block Address
Non-Erasing Block
Non-Erasing Block
Non-Erasing Block
Erasing Block
Erasing Block
Erasing Block
Any Address
Any Address
Any Address
Any Address
Address
Alternative
DQ7
DQ7
DQ7
DQ7
0
0
0
0
0
1
0
0
Bus Read operations from addresses within the
blocks being erased. Bus Read operations to ad-
dresses within blocks not being erased will output
the memory cell data as if in Read mode.
After an Erase operation that causes the Error Bit
to be set the Alternative Toggle Bit can be used to
identify which block or blocks have caused the er-
ror. The Alternative Toggle Bit changes from ’0’ to
’1’ to ’0’, etc. with successive Bus Read Opera-
tions from addresses within blocks that have not
erased correctly. The Alternative Toggle Bit does
not change if the addressed block has erased cor-
rectly.
No Toggle
Toggle
Toggle
Toggle
Toggle
Toggle
Toggle
Toggle
Toggle
Toggle
Toggle
DQ6
Data read as normal
DQ5
0
0
1
0
0
0
0
0
0
1
1
DQ3
–
–
–
1
0
0
1
1
–
1
1
No Toggle
No Toggle
No Toggle
Toggle
Toggle
Toggle
Toggle
Toggle
DQ2
–
–
–
RB
0
0
0
0
0
0
0
0
1
1
0
0