m58bw32f STMicroelectronics, m58bw32f Datasheet - Page 37

• Manufacturer Part Number: m58bw32f
• Description: 16 Or 32 Mbit X32, Boot Block, Burst 3.3v Supply Flash Memories
• Manufacturer: STMicroelectronics

M58BW16F, M58BW32F
4.10
4.11
Program/Erase Suspend command
The Program/Erase Suspend command is used to pause a Program or Erase operation. The
command will only be accepted during a Program or Erase operation. It can be issued at
any time during a Program or Erase operation. The command is ignored if the device is
already in suspend mode.
One Bus Write cycle is required to issue the Program/Erase Suspend command and pause
the Program/Erase controller. Once the command is issued it is necessary to poll the
Program/Erase Controller Status bit (bit 7) to find out when the Program/Erase controller
has paused; no other commands will be accepted until the Program/Erase controller has
paused. After the Program/Erase controller has paused, the memory will continue to output
the Status Register until another command is issued.
During the polling period between issuing the Program/Erase Suspend command and the
Program/Erase Controller pausing it is possible for the operation to complete. Once the
Program/Erase Controller Status bit (bit 7) indicates that the Program/Erase controller is no
longer active, the Program Suspend Status bit (bit 2) or the Erase Suspend Status bit (bit 6)
can be used to determine if the operation has completed or is suspended. For timing on the
delay between issuing the Program/Erase Suspend command and the Program/Erase
controller pausing see
During Program/Erase Suspend the Read Memory Array, Read Status Register, Read
Electronic Signature, Read Query and Program/Erase Resume commands will be accepted
by the command interface. Additionally, if the suspended operation was Erase then the
Program, the Write to Buffer and Program, the Set/Clear Block Protection Configuration
Register and the Program Suspend commands will also be accepted. When a program
operation is completed inside a Block Erase Suspend the Read Memory Array command
must be issued to reset the device in Read mode, then the Erase Resume command can be
issued to complete the whole sequence. Only the blocks not being erased may be read or
programmed correctly.
Erase operations can be suspended in a systematic and periodical way, however, in order to
ensure the effectiveness of erase operations and avoid infinite erase times, it is imperative to
wait a minimum time between successive Erase Resume and Erase Suspend commands.
This time, called the minimum effective erase time, is given in
See
Figure 29: Erase Suspend & Resume flowchart and
on using the Program/Erase Suspend command.
Program/Erase Resume command
The Program/Erase Resume command can be used to restart the Program/Erase controller
after a Program/Erase Suspend operation has paused it. One Bus Write cycle is required to
issue the Program/Erase Resume command.
See
Figure 29: Erase Suspend & Resume flowchart and
on using the Program/Erase Suspend command.
Appendix
Appendix
A,
A,
Figure 27: Program Suspend & Resume flowchart and
Figure 27: Program Suspend & Resume flowchart and
Table
12.
pseudocode, for suggested flowcharts
pseudocode, for suggested flowcharts
Table 12 on page
Command interface
pseudocode, and
pseudocode, and
40.
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