CAT28F512 CATALYST [Catalyst Semiconductor], CAT28F512 Datasheet - Page 10

• Manufacturer Part Number: CAT28F512
• Description: 512K-Bit CMOS Flash Memory
• Manufacturer: CATALYST [Catalyst Semiconductor]

CAT28F512
Figure 5. Chip Erase Algorithm
Note:
(1) The algorithm MUST BE FOLLOWED to ensure proper and reliable operation of the device.
Doc. No. 25042-00 2/98 F-1
INCREMENT
ADDRESS
NO
VERIFY COMMAND
SETUP COMMAND
START ERASURE
TIME OUT 10ms
PROGRAM ALL
BYTES TO 00H
WRITE ERASE
WRITE ERASE
WRITE ERASE
FROM DEVICE
TIME OUT 6 s
WRITE READ
COMPLETED
APPLY V PPH
APPLY V PPL
PLSCNT = 0
READ DATA
COMMAND
ADDRESS?
COMMAND
INITIALIZE
ADDRESS
INITIALIZE
ERASURE
DATA =
FFH?
LAST
YES
YES
(1)
NO
INC PLSCNT
APPLY V PPL
= 3000 ?
ERROR
ERASE
1000
YES
NO
10
OPERATION COMMAND
STANDBY
STANDBY
STANDBY
WRITE
WRITE
WRITE
WRITE
READ
BUS
VERIFY
ERASE
ERASE
ERASE
READ
ADDRESS = BYTE TO VERIFY
INCREMENT PULSE COUNT
STOPS ERASE OPERATION
COMPARE OUTPUT TO FF
PLSCNT = PULSE COUNT
RESETS THE REGISTER
(OR V PP HARDWIRED)
(OR V PP HARDWIRED)
FOR READ OPERATION
V PP RAMPS TO V PPH
V PP RAMPS TO V PPL
PROGRAMMED TO 00
INITIALIZE ADDRESS
ALL BYTES SHALL BE
NEEDS 10ms PULSE,
BEFORE AN ERASE
VERIFY ERASURE
ACTUAL ERASE
READ BYTE TO
DATA = 20H
COMMENTS
OPERATION
DATA = 20H
DATA = 20H;
DATA = 20H
DATA = 00H
WAIT
WAIT
40H;
A0H
Preliminary
5108 FHD F10