M50FW040 データシートの表示（PDF） - STMicroelectronics

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M50FW040

4 Mbit (512Kb x8, Uniform Block) 3V Supply Firmware Hub Flash Memory

STMicroelectronics 

M50FW040

Program/Erase Suspend Command. The Pro-

gram/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 nec-

essary 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 Reg-

ister until another command is issued.

During the polling period between issuing the Pro-

gram/Erase Suspend command and the Program/

Erase Controller pausing it is possible for the op-

eration to complete. Once Program/Erase Control-

ler Status bit indicates that the Program/Erase

Controller is no longer active, the Program Sus-

pend Status bit or the Erase Suspend Status bit

can be used to determine if the operation has com-

pleted or is suspended. For timing on the delay be-

tween issuing the Program/Erase Suspend

command and the Program/Erase Controller

pausing see Table 12.

During Program/Erase Suspend the Read Memo-

ry Array, Read Status Register, Read Electronic

Signature and Program/Erase Resume com-

mands will be accepted by the Command Inter-

face. Additionally, if the suspended operation was

Erase then the Program command will also be ac-

cepted; only the blocks not being erased may be

read or programmed correctly.

See Figure 20., Program Suspend & Resume

Flowchart and Pseudo Code, and Figure

22., Erase Suspend & Resume Flowchart and

Pseudo Code, for suggested flowcharts on using

the Program/Erase Suspend command.

Program/Erase Resume Command. The Pro-

gram/Erase Resume command can be used to re-

start the Program/Erase Controller after a

Program/Erase Suspend operation has paused it.

One Bus Write cycle is required to issue the Pro-

gram/Erase Resume command. Once the com-

mand is issued subsequent Bus Read operations

read the Status Register.

Table 6. Read Electronic Signature

Code

Address

Manufacturer Code

00000h

Device Code

00001h

Data

20h

2Ch

15/41

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