CAT28F020 CATALYST [Catalyst Semiconductor], CAT28F020 Datasheet - Page 10

• Manufacturer Part Number: CAT28F020
• Description: 2 Megabit CMOS Flash Memory
• Manufacturer: CATALYST [Catalyst Semiconductor]

CAT28F020
Note:
(1) The algorithm MUST BE FOLLOWED to ensure proper and reliable operation of the device.
Doc. No. 25037-00 2/98 F-1
Figure 5. Chip Erase Algorithm
INCREMENT
ADDRESS
NO
VERIFY COMMAND
SETUP COMMAND
START ERASURE
TIME OUT 10ms
PROGRAM ALL
BYTES TO 00H
FROM DEVICE
WRITE ERASE
WRITE ERASE
WRITE ERASE
TIME OUT 6 s
APPLY V PPH
WRITE READ
COMPLETED
APPLY V PPL
PLSCNT = 0
READ DATA
ADDRESS?
COMMAND
COMMAND
INITIALIZE
ADDRESS
INITIALIZE
ERASURE
DATA =
FFH?
LAST
YES
YES
(1)
NO
INC PLSCNT
APPLY V PPL
= 3000 ?
=1000 ?
ERROR
ERASE
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)
FOR READ OPERATION
(OR V PP HARDWIRED)
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
READ BYTE TO
ACTUAL ERASE
DATA=20H
COMMENTS
OPERATION
DATA = 20H;
DATA = 20H
DATA = 20H
DATA = 00H
DATA = 20H
WAIT
WAIT
A0H
5108 FHD F10