M58WR064T datasheet(69/81 Pages) STMICROELECTRONICS

Part #	M58WR064T

Description	64 Mbit (4Mb x 16, Multiple Bank, Burst ) 1.8V Supply Flash Memory

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

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M58WR064T, M58WR064B

Figure 22. Block Erase Flowchart and Pseudo Code

Note: If an error is found, the Status Register must be cleared before further Program/Erase operations.

Write 20h

AI06174

Start

Write Block

Address & D0h

Read Status

Register

YES

NO

SR7 = 1

YES

NO

SR3 = 0

YES

SR4, SR5 = 1

VPP Invalid

Error (1)

Command

Sequence Error (1)

NO

SR5 = 0

Erase Error (1)

End

YES

NO

SR1 = 0

Erase to Protected

Block Error (1)

YES

erase_command ( blockToErase ) {

writeToFlash (bank_address, 0x20) ;

writeToFlash (blockToErase, 0xD0) ;

/* only A12-A20 are significannt */

/* Memory enters read status state after

the Erase Command */

} while (status_register.SR7== 0) ;

do {

status_register=readFlash (bank_address) ;

/* E or G must be toggled*/

if (status_register.SR3==1) /*VPP invalid error */

error_handler ( ) ;

if ( (status_register.SR4==1) && (status_register.SR5==1) )

/* command sequence error */

error_handler ( ) ;

if (status_register.SR1==1) /*program to protect block error */

error_handler ( ) ;

if ( (status_register.SR5==1) )

/* erase error */

error_handler ( ) ;

}

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