m28w640fc Numonyx, m28w640fc Datasheet - Page 68
m28w640fc
Manufacturer Part Number
m28w640fc
Description
64 Mbit 4mbx16, Boot Block 3v Supply Flash Memory
Manufacturer
Numonyx
Datasheet
1.M28W640FC.pdf
(77 pages)
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
m28w640fcB70N6
Manufacturer:
ST
Quantity:
8 570
Part Number:
m28w640fcB70N6E
Manufacturer:
ST
Quantity:
20 000
Company:
Part Number:
m28w640fcB70ZB6E
Manufacturer:
ST
Quantity:
474
Company:
Part Number:
m28w640fcT70N6
Manufacturer:
ST
Quantity:
178
Flowcharts and pseudo codes
Figure 20. Erase flowchart and pseudo code
1. If an error is found, the Status Register must be cleared before further Program/Erase operations.
68/77
Address & D0h
Read Status
Write Block
b4, b5 = 1
Write 20h
Register
b7 = 1
b3 = 0
b5 = 0
b1 = 0
Start
End
YES
YES
NO
YES
YES
NO
NO
YES
NO
NO
Sequence Error (1)
Erase to Protected
Erase Error (1)
Block Error (1)
V PP Invalid
Command
Error (1)
if ( (status_register.b5==1) )
/* erase error */
erase_command ( blockToErase ) {
if (status_register.b3==1) /*VPP invalid error */
if ( (status_register.b4==1) && (status_register.b5==1) )
/* command sequence error */
if (status_register.b1==1) /*program to protect block error */
}
do {
error_handler ( ) ;
error_handler ( ) ;
error_handler ( ) ;
error_handler ( ) ;
writeToFlash (any_address, 0x20) ;
writeToFlash (blockToErase, 0xD0) ;
/* only A12-A20 are significannt */
/* Memory enters read status state after
the Erase Command */
} while (status_register.b7== 0) ;
status_register=readFlash (any_address) ;
/* E or G must be toggled*/
M28W640FCT, M28W640FCB
AI03541b