M50FW080 datasheet(26/56 Pages) STMICROELECTRONICS

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Command interface

M50FW080

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4.9

Program/Erase Suspend command

The Program/Erase Suspend command can be used to pause a Program or Block Erase

operation. 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 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

Program/Erase Controller Status bit indicates that the Program/Erase Controller is no longer

active, the Program Suspend Status bit or the Erase Suspend Status bit 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 Table 14.

During Program/Erase Suspend the Read Memory Array, Read Status Register, Read

Electronic Signature and Program/Erase Resume commands will be accepted by the

Command Interface. Additionally, if the suspended operation was Block Erase then the

Program command will also be accepted; only the blocks not being erased may be read or

programmed correctly.

See Figure 20, and Figure 23, for suggested flowcharts on using the Program/Erase

Suspend command.

4.10

Program/Erase Resume command

The Program/Erase Resume command can be used to restart the Program/Erase Controller

after a Program/Erase Suspend has paused it. One Bus Write cycle is required to issue the

Program/Erase Resume command. Once the command is issued subsequent Bus Read

operations read the Status Register.

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