M28W640 STMicroelectronics, M28W640 Datasheet - Page 46

• Manufacturer Part Number: M28W640
• Description: 64 Mbit 4Mb x16/ Boot Block 3V Supply Flash Memory
• Manufacturer: STMicroelectronics

M28W640CT, M28W640CB
Figure 19. Quadruple Word Program Flowchart and Pseudo Code
Note: 1. Status check of b1 (Protected Block), b3 (V
46/54
2. If an error is found, the Status Register must be cleared before further Program/Erase operations.
3. Address 1 to Address 4 must be consecutive addresses differing only for bits A0 and A1.
Write Address 1
Write Address 2
Write Address 3
Write Address 4
a sequence.
Read Status
& Data 1 (3)
& Data 2 (3)
& Data 3 (3)
& Data 4 (3)
Write 55h
Register
b7 = 1
b3 = 0
b4 = 0
b1 = 0
Start
End
YES
YES
YES
YES
NO
NO
NO
NO
Program to Protected
Block Error (1, 2)
V PP Invalid
Error (1, 2)
Error (1, 2)
Program
PP
Invalid) and b4 (Program Error) can be made after each program operation or after
quadruple_word_program_command (addressToProgram1, dataToProgram1,
{
if (status_register.b3==1) /*VPP invalid error */
if (status_register.b4==1) /*program error */
if (status_register.b1==1) /*program to protect block error */
}
error_handler ( ) ;
error_handler ( ) ;
error_handler ( ) ;
do {
writeToFlash (any_address, 0x55) ;
writeToFlash (addressToProgram1, dataToProgram1) ;
writeToFlash (addressToProgram2, dataToProgram2) ;
writeToFlash (addressToProgram3, dataToProgram3) ;
writeToFlash (addressToProgram4, dataToProgram4) ;
the Program command*/
} while (status_register.b7== 0) ;
status_register=readFlash (any_address) ;
/* E or G must be toggled*/
/*Memory enters read status state after
addressToProgram2, dataToProgram2,
addressToProgram3, dataToProgram3,
addressToProgram4, dataToProgram4)
/*see note (3) */
/*see note (3) */
/*see note (3) */
/*see note (3) */
AI04398