M28W320 데이터 시트보기 (PDF) - STMicroelectronics

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M28W320

32 Mbit (2Mb x16, Boot Block) 3V Supply Flash Memory

STMicroelectronics 

Flowcharts and pseudo codes

Figure 20. Erase Flowchart and Pseudo Code

M28W320FCT, M28W320FCB

Start

Write 20h

Write Block

Address & D0h

Read Status

Register

erase_command ( blockToErase ) {

writeToFlash (any_address, 0x20) ;

writeToFlash (blockToErase, 0xD0) ;

/* only A12-A20 are significannt */

/* Memory enters read status state after

the Erase Command */

do {

status_register=readFlash (any_address) ;

/* E or G must be toggled*/

NO

b7 = 1

YES

NO

b3 = 0

YES

YES

b4, b5 = 1

NO

NO

b5 = 0

YES

NO

b1 = 0

YES

End

VPP Invalid

Error (1)

Command

Sequence Error (1)

Erase Error (1)

Erase to Protected

Block Error (1)

} while (status_register.b7== 0) ;

if (status_register.b3==1) /*VPP invalid error */

error_handler ( ) ;

if ( (status_register.b4==1) && (status_register.b5==1) )

/* command sequence error */

error_handler ( ) ;

if ( (status_register.b5==1) )

/* erase error */

error_handler ( ) ;

if (status_register.b1==1) /*program to protect block error */

error_handler ( ) ;

}

AI03541b

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

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