EN25F20_1 Datasheet, PDF (22/33 Pages) Eon Silicon Solution Inc. – 2 Mbit Serial Flash Memory with 4Kbytes Uniform Sector

EN25F20
Enter OTP Mode (3Ah)
This Flash has an extra 256 bytes OTP sector, user must issue ENTER OTP MODE command to read,
program or erase OTP sector. After entering OTP mode, the OTP sector is mapping to sector 63, SRP
bit becomes OTP_LOCK bit and can be read with RDSR command. Program / Erase command will be
disabled when OTP_LOCK is ‘1’
WRSR command will ignore the input data and program LOCK_BIT to 1.
User must clear the protect bits before enter OTP mode.
OTP sector can only be program and erase when LOCK_BIT equal ‘0’ and BP [2:0] = ‘000’. In OTP
mode, user can read other sectors, but program/erase other sectors only allowed when OTP_LOCK
equal ‘0’.
User can use WRDI (04h) command to exit OTP mode.
Table 7. OTP Sector Address
Sector
63
Sector Size
256 byte
Address Range
03F000h – 03F0FFh
Note: The OTP sector is mapping to sector 63
Figure 20. Enter OTP Mode
This Data Sheet may be revised by subsequent versions
22
or modifications due to changes in technical specifications.
©2004 Eon Silicon Solution, Inc.,
Rev. E, Issue Date: 2008/12/15
www.eonssi.com