CAT28F020 CATALYST [Catalyst Semiconductor], CAT28F020 Datasheet - Page 12

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

CAT28F020
Figure 7. Programming Algorithm
Note:
(1) The algorithm MUST BE FOLLOWED to ensure proper and reliable operation of the device.
Doc. No. 25037-00 2/98 F-1
INCREMENT
ADDRESS
NO
WRITE PROG. CMD
VERIFY COMMAND
PROG. COMMAND
WRITE PROGRAM
ADDR AND DATA
PROGRAMMING
PROGRAMMING
TIME OUT 10 s
FROM DEVICE
WRITE SETUP
TIME OUT 6 s
WRITE READ
COMPLETED
APPLY V PPH
APPLY V PPL
PLSCNT = 0
READ DATA
ADDRESS?
COMMAND
INITIALIZE
ADDRESS
VERIFY
DATA ?
START
LAST
YES
YES
(1)
NO
APPLY V PPL
PROGRAM
PLSCNT
ERROR
= 25 ?
INC
YES
NO
12
OPERATION
2ND WRITE
1ST WRITE
1ST WRITE
1ST WRITE
STANDBY
STANDBY
STANDBY
CYCLE
CYCLE
CYCLE
CYCLE
READ
BUS
COMMAND
PROGRAM
PROGRAM
VERIFY
SETUP
WRITE
READ
VALID ADDRESS AND DATA
COMPARE DATA OUTPUT
SETS THE REGISTER FOR
INITIALIZE PULSE COUNT
PLSCNT = PULSE COUNT
READ BYTE TO VERIFY
(OR V PP HARDWIRED)
(OR V PP HARDWIRED)
V PP RAMPS TO V PPH
V PP RAMPS TO V PPL
INITIALIZE ADDRESS
TO DATA EXPECTED
READ OPERATION
PROGRAMMING
COMMENTS
DATA = C0H
DATA = 40H
DATA = 00H
WAIT
WAIT
5108 FHD F06