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| EN25F20 Datasheet, PDF (20/31 Pages) Eon Silicon Solution Inc. – 2 Mbit Serial Flash Memory with 4Kbytes Uniform Sector | |||
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EN25F20
Figure 19. Read Identification (RDID)
Enter OTP Mode (3Ah)
This Flash has a extra 256 bytes OTP sector, user must issue ENTER OTP MODE command to enter
OTP mode before reading / programming or erasing OTP sector. After entering OTP mode, the OTP
sector is mapping to sector 63, SRP bit becomes OTP_LOCK bit and can be reading by RDSR command.
Program / Erase command will be disabled when OTP_LOCK is â1â
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 â0â and sector 63 not protected. In
OTP mode, user can read other sectors, but program/erase other sectors only allowed when OTP_LOCK
equal â0â.
User can use WRDI (04H) command to exit OTP mode.
Figure 20. Enter OTP Mode
This Data Sheet may be revised by subsequent versions 20 ©2004 Eon Silicon Solution, Inc., www.essi.com.tw
or modifications due to changes in technical specifications.
Rev. B, Issue Date: 2007/05/15
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