M28W320FCT datasheet(57/69 Pages) NUMONYX

Part #	M28W320FCT

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

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Manufacturer	NUMONYX [Numonyx B.V]

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57 / 69 page

M28W320FCT, M28W320FCB

Flowcharts and pseudo codes

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Figure 17.

Double Word Program Flowchart and Pseudo Code

1.

Status check of b1 (Protected Block), b3 (VPP Invalid) and b4 (Program Error) can be made after each program operation

or after a sequence.

2.

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

3.

Address 1 and Address 2 must be consecutive addresses differing only for bit A0.

Write 30h

AI03539b

Start

Write Address 1

& Data 1 (3)

Read Status

Register

YES

NO

b7 = 1

YES

NO

b3 = 0

NO

b4 = 0

VPP Invalid

Error (1, 2)

Program

Error (1, 2)

YES

End

YES

NO

b1 = 0

Program to Protected

Block Error (1, 2)

Write Address 2

& Data 2 (3)

double_word_program_command (addressToProgram1, dataToProgram1,

addressToProgram2, dataToProgram2)

{

writeToFlash (any_address, 0x30) ;

writeToFlash (addressToProgram1, dataToProgram1) ;

/*see note (3) */

writeToFlash (addressToProgram2, dataToProgram2) ;

/*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 ( ) ;

}

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