M28W640 STMicroelectronics, M28W640 Datasheet - Page 45

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

Figure 18. Double Word Program Flowchart and Pseudo Code
Note: 1. Status check of b1 (Protected Block), b3 (V
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.
a sequence.
Write Address 1
Write Address 2
Read Status
& Data 1 (3)
& Data 2 (3)
Write 30h
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
double_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 {
} while (status_register.b7== 0) ;
writeToFlash (any_address, 0x30) ;
writeToFlash (addressToProgram1, dataToProgram1) ;
writeToFlash (addressToProgram2, dataToProgram2) ;
the Program command*/
status_register=readFlash (any_address) ;
/* E or G must be toggled*/
/*Memory enters read status state after
addressToProgram2, dataToProgram2)
M28W640CT, M28W640CB
/*see note (3) */
/*see note (3) */
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