M28W640HCT datasheet(59/72 Pages) NUMONYX

59 / 72 page

M28W640HCT, M28W640HCB

Flowcharts and pseudocodes

59/72

Appendix C

Flowcharts and pseudocodes

Figure 15.

Program flowchart and pseudocode

Status check of b1 (protected block), b3 (VPP invalid) and b4 (program error) can be made after each program operation or

after a sequence.

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

Write 40h or 10h

AI03538b

Start

Write Address

& Data

Read Status

YES

b7 = 1

YES

b3 = 0

b4 = 0

VPP Invalid

Error (1, 2)

Program

Error (1, 2)

program_command (addressToProgram, dataToProgram) {:

writeToFlash (any_address, 0x40) ;

/*or writeToFlash (any_address, 0x10) ; */

do {

status_register=readFlash (any_address) ;

/* E or G must be toggled*/

} while (status_register.b7== 0) ;

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

error_handler ( ) ;

YES

End

YES

b1 = 0

Program to Protected

Block Error (1, 2)

writeToFlash (addressToProgram, dataToProgram) ;

/*Memory enters read status state after

the Program Command*/

if (status_register.b4==1) /*program error */

error_handler ( ) ;

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

error_handler ( ) ;

}

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