M36W432B datasheet(52/57 Pages) STMICROELECTRONICS

Part #	M36W432B

Description	32 Mbit 2Mb x16, Boot Block Flash Memory and 4 Mbit 256K x16 SRAM, Multiple Memory Product

PDF	57 Pages

Scroll/Zoom	100%

Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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52 / 57 page

M36W432T, M36W432B

52/57

Figure 28. Erase Flowchart and Pseudo Code

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

do {

status_register=readFlash (any_address) ;

/* EF or GF must be toggled*/

Write 20h

AI05225

Start

Write Block

Address & D0h

Read Status

YES

b7 = 1

YES

b3 = 0

YES

b4, b5 = 1

VPPF Invalid

Error (1)

Command

Sequence Error (1)

b5 = 0

Erase Error (1)

End

YES

b1 = 0

Erase to Protected

Block Error (1)

YES

erase_command ( blockToErase ) {

writeToFlash (any_address, 0x20) ;

writeToFlash (blockToErase, 0xD0) ;

/* only A12-A20 are significannt */

/* Memory enters read status state after

the Erase Command */

} while (status_register.b7== 0) ;

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

error_handler ( ) ;

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

/* command sequence error */

error_handler ( ) ;

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

error_handler ( ) ;

if ( (status_register.b5==1) )

/* erase error */

error_handler ( ) ;

}

M36W432B Datasheet(PDF) 52 Page - STMicroelectronics

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