M50LPW041 datasheet(11/37 Pages) STMICROELECTRONICS

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M50LPW041

If the address falls in a protected block then the

Program operation will abort, the data in the

memory array will not be changed and the Status

During the Program operation the memory will

only accept the Read Status Register command

and the Program/Erase Suspend command. All

other commands will be ignored. Typical Program

times are given in Table 13.

Note that the Program command cannot change a

bit set at ‘0’ back to ‘1’ and attempting to do so will

not cause any modification on its value. One of the

Erase commands must be used to set all of the

bits in the block to ‘1’.

See Figure 14, Program Flowchart and Pseudo

Code, for a suggested flowchart on using the

Program command.

Quadruple Byte Program Command. The Qua-

druple Byte Program Command can be only used

in A/A Mux mode to program four adjacent bytes

in the memory array at a time. The four bytes must

differ

only for

the

addresses A0

and

A1.

Programming should not be attempted when VPP

is not at VPPH. The operation can also be executed

if VPP is below VPPH, but result could be uncertain.

Five Bus Write operations are required to issue the

command. The second, the third and the fourth

Bus Write cycle latches respectively the address

and data of the first, the second and the third byte

in the internal state machine. The fifth Bus Write

cycle latches the address and data of the fourth

byte in the internal state machine and starts 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 Quadruple Byte Program operation the

memory will only accept the Read Status register

command and the Program/Erase Suspend com-

mand. All other commands will be ignored. Typical

Quadruple Byte Program times are given in Table

13.

Note that the Quadruple Byte Program command

cannot change a bit set to ‘0’ back to ‘1’ and

attempting to do so will not cause any modification

on its value. One of the Erase commands must be

used to set all of the bits in the block to ‘1’.

See Figure 15, Quadruple Byte Program Flow-

chart and Pseudo Code, for a suggested flowchart

on using the Quadruple Byte Program command.

Chip Erase Command. The Chip Erase Com-

mand can be only 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

memory will only accept the Read Status Register

command. All other commands will be ignored.

Typical Chip Erase times are given in Table 13.

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

on using the Chip Erase command.

Table 9. A/A Mux Bus Operations

Table 10. Manufacturer and Device Codes

Operation

VPP

DQ7-DQ0

Bus Read

VIL

VIH

Don’t Care

Data Output

Bus Write

VIH

VIL

VIH

Float or VCC or VPPH

Data Input

Output Disable

VIH

Don’t Care

Hi-Z

Reset

VIL or VIH

VIL

Don’t Care

Hi-Z

Operation

A18-A1

DQ7-DQ0

Manufacturer Code

VIL

VIH

VIL

20h

Device Code

VIL

VIH

VIL

VIH

3Ch

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