EN25B32 Datasheet, PDF (25/38 Pages) Eon Silicon Solution Inc. – 32 Mbit Serial Flash Memory with Boot and Parameter Sectors

EN25B32
Enter OTP Mode (3Ah)
This Flash has a extra 512 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 0 ( bottom boot ) or sector 67 ( top boot ) respectively, SRP bit becomes
OTP_LOCK bit and can be reading by 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 sector 0 ( bottom boot ) or
sector 67 ( top boot ) not protected. 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.
Figure 19. Enter OTP Mode
Table 7a. Bottom Boot Security Sector Address
Sector Size
(bytes)
512
Address Range
Byte mode (x8)
000000h – 0001FFh
Table 7b. Top Boot Security Sector Address
Sector Size
(bytes)
512
Address Range
Byte mode (x8)
3FFE00h – 3FFFFFh
This Data Sheet may be revised by subsequent versions ₂₅ ©2004 Eon Silicon Solution, Inc., www.essi.com.tw
or modifications due to changes in technical specifications.
Rev. C, Issue Date: 2007/06/21