M29F032D70N1 STMICROELECTRONICS [STMicroelectronics], M29F032D70N1 Datasheet - Page 12

• Manufacturer Part Number: M29F032D70N1
• Description: 32 Mbit (4Mb x8, Uniform Block) 5V Supply Flash Memory
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

M29F032D
During Erase Suspend it is possible to Read and
Program cells in blocks that are not being erased;
both Read and Program operations behave as
normal on these blocks. If any attempt is made to
program in a protected block or in the suspended
block then the Program command is ignored and
the data remains unchanged. The Status Register
is not read and no error condition is given. Read-
ing from blocks that are being erased will output
the Status Register.
It is also possible to issue the Auto Select, Read
CFI Query and Unlock Bypass commands during
an Erase Suspend. The Read/Reset command
must be issued to return the device to Read Array
mode before the Resume command will be ac-
cepted.
Erase Resume Command. The Erase Resume
command must be used to restart the Program/
Erase Controller after an Erase Suspend. The de-
vice must be in Read Array mode before the Re-
sume command will be accepted. An erase can be
suspended and resumed more than once.
Read CFI Query Command. The
Query Command is used to read data from the
Common Flash Interface (CFI) Memory Area. This
Table 3. Commands
Note: X Don’t Care, PA Program Address, PD Program Data, BA Any address in the Block. All values in the table are in hexadecimal.
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Read/Reset
Auto Select
Program
Unlock Bypass
Unlock Bypass
Program
Unlock Bypass Reset
Chip Erase
Block Erase
Erase Suspend
Erase Resume
Read CFI Query
Command
6+
1
3
3
4
3
2
2
6
1
1
1
Addr Data
555
555
555
555
555
555
55
X
X
X
X
X
1st
AA
AA
AA
AA
AA
AA
A0
B0
F0
90
30
98
Read
Addr
2AA
2AA
2AA
2AA
2AA
2AA
PA
X
2nd
CFI
Data Addr
PD
55
55
55
55
00
55
55
555
555
555
555
555
command is valid when the device is in the Read
Array mode, or when the device is in Autoselected
mode.
One Bus Write cycle is required to issue the Read
CFI Query Command. Once the command is is-
sued subsequent Bus Read operations read from
the Common Flash Interface Memory Area.
The Read/Reset command must be issued to re-
turn the device to the previous mode (the Read Ar-
ray mode or Autoselected mode). A second Read/
Reset command would be needed if the device is
to be put in the Read Array mode from Autoselect-
ed mode.
See Appendix B, Tables 17, 18, 19, 20, 21 and 22
for details on the information contained in the
Common Flash Interface (CFI) memory area.
Block Protect and Chip Unprotect Com-
mands. Groups of blocks can be protected
against accidental Program or Erase. The Protec-
tion Groups are shown in Appendix A, Table 16.
The whole chip can be unprotected to allow the
data inside the blocks to be changed.
Block Protect and Chip Unprotect operations are
described in Appendix C.
X
Bus Write Operations
3rd
Data
A0
F0
90
20
80
80
Addr Data
555
555
PA
4th
PD
AA
AA
Addr
2AA
2AA
5th
Data Addr
55
55
555
BA
6th
Data
10
30