M50LPW002K datasheet(15/39 Pages) STMICROELECTRONICS

15 / 39 page

15/39

M50LPW002

See Figure 15, Quadruple Byte Program Flow-

chart and Pseudo Code (A/A Mux Interface Only),

for a suggested flowchart on using the Quadruple

Byte Program command.

Chip Erase Command. The Chip Erase com-

mand can be used in A/A Mux mode to erase the

entire chip at a time. Erasing should not be at-

tempted when VPP is not at VPPH. The operation

can also be executed if VPP is below VPPH, but re-

sult could be uncertain. Two Bus Write operations

are required to issue the command and start the

Program/Erase Controller. Once the command is

issued, subsequent Bus Read operations read the

Status Register. (See the section on the Status

During the Chip Erase operation, the memory only

accepts the Read Status Register command. All

other commands are ignored.

Typical Chip Erase times are given in Table 23.

The Chip Erase command sets all of the bits in the

memory to ‘1’. See Figure 17, Chip Erase Flow-

chart and Pseudo Code, for a suggested flowchart

when using the Chip Erase command.

Block Erase Command. The Block Erase com-

mand can be used to erase a block. Two Bus Write

operations are required to issue the command; the

second Bus Write cycle latches the block address

in the internal state machine and starts the Pro-

gram/Erase Controller. Once the command is is-

sued subsequent Bus Read operations read the

Status Register. See the section on the Status

If the block is protected then the Erase operation

will abort, the data in the block will not be changed

and the Status Register will output the error.

During the Erase operation the memory only

accepts the Read Status Register command and

the Program/Erase Suspend command. All other

commands are ignored. Typical Erase times are

given in Table 23.

The Erase command sets all of the bits in the block

to ‘1’. All previous data in the block is lost.

See Figure 18, Block Erase Flowchart and Pseudo

Code, for a suggested flowchart on using the

Erase command.

Clear Status Register Command. The Clear Sta-

tus Register command can be used to reset bits 1,

3, 4 and 5 in the Status Register to ‘0’. One Bus

Write is required to issue the Clear Status Register

command. Once the command is issued the mem-

ory returns to its previous mode, subsequent Bus

Read operations continue to output the same data.

The bits in the Status Register are sticky and do

not automatically return to ‘0’ when a new Program

or Erase command is issued. If an error occurs

then it is essential to clear any error bits in the Sta-

tus Register by issuing the Clear Status Register

command before attempting a new Program or

Erase command.

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

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 23.

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 16, Program Suspend and Resume

Flowchart, and Pseudo Code, and Figure 19,

Erase Suspend and 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

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

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