M28W640HCT datasheet(61/72 Pages) NUMONYX

61 / 72 page

M28W640HCT, M28W640HCB

Flowcharts and pseudocodes

61/72

Figure 17.

Quadruple Word 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 operations.

Address 1 to address 4 must be consecutive addresses differing only for bits A0 and A1.

Write 56h

AI06233

Start

Write Address 1

& Data 1 (3)

Read Status

YES

b7 = 1

YES

b3 = 0

b4 = 0

VPP Invalid

Error (1, 2)

Program

Error (1, 2)

YES

End

YES

b1 = 0

Program to Protected

Block Error (1, 2)

Write Address 2

& Data 2 (3)

quadruple_word_program_command (addressToProgram1, dataToProgram1,

addressToProgram2, dataToProgram2,

addressToProgram3, dataToProgram3,

addressToProgram4, dataToProgram4)

{

writeToFlash (any_address, 0x56) ;

writeToFlash (addressToProgram1, dataToProgram1) ;

/*see note (3) */

writeToFlash (addressToProgram2, dataToProgram2) ;

/*see note (3) */

writeToFlash (addressToProgram3, dataToProgram3) ;

/*see note (3) */

writeToFlash (addressToProgram4, dataToProgram4) ;

/*see note (3) */

/*Memory enters read status state after

the Program command*/

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 ( ) ;

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

error_handler ( ) ;

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

error_handler ( ) ;

}

Write Address 3

& Data 3 (3)

Write Address 4

& Data 4 (3)

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