M58WR064FB Ver la hoja de datos (PDF) - STMicroelectronics

Número de pieza

componentes Descripción

Fabricante

M58WR064FB

64 Mbit (4Mb x16, Multiple Bank, Burst) 1.8V Supply Flash Memory

STMicroelectronics 

M58WR064FT, M58WR064FB

If the second bus cycle is not Write Erase Confirm

(D0h), Status Register bits SR4 and SR5 are set

and the command aborts. Erase aborts if Reset

turns to VIL. As data integrity cannot be guaran-

teed when the Erase operation is aborted, the

block must be erased again.

Once the command is issued the device outputs

the Status Register data when any address within

the bank is read. At the end of the operation the

bank will remain in Read Status Register mode un-

til a Read Array, Read CFI Query or Read Elec-

tronic Signature command is issued.

During Erase operations the bank containing the

block being erased will only accept the Read Ar-

ray, Read Status Register, Read Electronic Signa-

ture, Read CFI Query and the Program/Erase

Suspend command, all other commands will be ig-

nored. Refer to Dual Operations section for de-

tailed information about simultaneous operations

allowed in banks not being erased. Typical Erase

times are given in Table 14., Program/Erase

Times and Endurance Cycles.

See APPENDIX C., Figure 26., Block Erase Flow-

chart and Pseudo Code, for a suggested flowchart

for using the Block Erase command.

Program Command

The memory array can be programmed word-by-

word. Only one Word in one bank can be pro-

grammed at any one time. Two bus write cycles

are required to issue the Program Command.

■ The first bus cycle sets up the Program

command.

■ The second latches the Address and the Data

to be written and starts the Program/Erase

Controller.

After programming has started, read operations in

the bank being programmed output the Status

Register content.

During Program operations the bank being pro-

grammed will only accept the Read Array, Read

Status Register, Read Electronic Signature, Read

CFI Query and the Program/Erase Suspend com-

mand. Refer to Dual Operations section for de-

tailed information about simultaneous operations

allowed in banks not being programmed. Typical

Program times are given in Table 14., Program/

Erase Times and Endurance Cycles.

Programming aborts if Reset goes to VIL. As data

integrity cannot be guaranteed when the program

operation is aborted, the memory location must be

reprogrammed.

See APPENDIX C., Figure 22., Program Flow-

chart and Pseudo Code, for the flowchart for using

the Program command.

Program/Erase Suspend Command

The Program/Erase Suspend command is used to

pause a Program or Block Erase operation. A

Bank Erase operation cannot be suspended.

One bus write cycle is required to issue the Pro-

gram/Erase command. Once the Program/Erase

Controller has paused bits SR7, SR6 and/ or SR2

of the Status Register will be set to ‘1’. The com-

mand can be addressed to any bank.

During Program/Erase Suspend the Command In-

terface will accept the Program/Erase Resume,

Read Array (cannot read the erase-suspended

block or the program-suspended Word), Read

Status Register, Read Electronic Signature and

Read CFI Query commands. Additionally, if the

suspend operation was Erase then the Clear sta-

tus Register, Program, Block Lock, Block Lock-

Down or Block Unlock commands will also be ac-

cepted. The block being erased may be protected

by issuing the Block Lock, Block Lock-Down or

Protection Register Program commands. Only the

blocks not being erased may be read or pro-

grammed correctly. When the Program/Erase Re-

sume command is issued the operation will

complete. Refer to the Dual Operations section for

detailed information about simultaneous opera-

tions allowed during Program/Erase Suspend.

During a Program/Erase Suspend, the device can

be placed in standby mode by taking Chip Enable

to VIH. Program/Erase is aborted if Reset turns to

VIL.

See APPENDIX C., Figure 25., Program Suspend

& Resume Flowchart and Pseudo Code, and Fig-

ure 27., Erase Suspend & Resume Flowchart and

Pseudo Code, for flowcharts for using the Pro-

gram/Erase Suspend command.

Program/Erase Resume Command

The Program/Erase Resume command can be

used to restart the Program/Erase Controller after

a Program/Erase Suspend command has paused

it. One Bus Write cycle is required to issue the

command. The command can be written to any

address.

The Program/Erase Resume command does not

change the read mode of the banks. If the sus-

pended bank was in Read Status Register, Read

Electronic signature or Read CFI Query mode the

bank remains in that mode and outputs the corre-

sponding data. If the bank was in Read Array

mode subsequent read operations will output in-

valid data.

If a Program command is issued during a Block

Erase Suspend, then the erase cannot be re-

sumed until the programming operation has com-

pleted. It is possible to accumulate suspend

operations. For example: suspend an erase oper-

ation, start a programming operation, suspend the

15/87

Share Link: