m28w640hcb STMicroelectronics, m28w640hcb Datasheet - Page 61

• Manufacturer Part Number: m28w640hcb
• Description: 64 Mbit 4 Mb X 16, Boot Block 3 V Supply Flash Memory
• Manufacturer: STMicroelectronics

M28W640HCT, M28W640HCB
Figure 17. Quadruple Word Program flowchart and pseudocode
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 to address 4 must be consecutive addresses differing only for bits A0 and A1.
after a sequence.
Write Address 1
Write Address 2
Write Address 3
Write Address 4
Read Status
& Data 1 (3)
& Data 2 (3)
& Data 3 (3)
& Data 4 (3)
Write 56h
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
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, 0x56) ;
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
Flowcharts and pseudocodes
addressToProgram2, dataToProgram2,
addressToProgram3, dataToProgram3,
addressToProgram4, dataToProgram4)
/*see note (3) */
/*see note (3) */
/*see note (3) */
/*see note (3) */
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