M50FW040 datasheet(24/53 Pages) STMICROELECTRONICS

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Command interface

M50FW040

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4.7

Program/Erase Suspend command

The Program/Erase Suspend command can be used to pause a Program or 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 12.

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 Erase then the Program

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

programmed correctly.

See Figure 19: Program Suspend & Resume flowchart and pseudo code, and Figure 21:

Erase Suspend & Resume flowchart and pseudo code, for suggested flowcharts on using

the Program/Erase Suspend command.

4.8

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. Once the command is issued subsequent Bus

Read operations read the Status Register.

Table 6.

Read electronic signature

Code

Address

Data

Manufacturer code

00000h

20h

Device code

00001h

2Ch

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