EN25F32 Datasheet, PDF (28/40 Pages) Eon Silicon Solution Inc. – 32 Megabit Serial Flash Memory with 4Kbytes Uniform Sector

EN25F32
Figure 19. Read Identification (RDID)
Enter OTP Mode (3Ah)
This Flash has an extra 512 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 1,023,
SRP bit becomes OTP_LOCK bit and can be read with RDSR command. Program / Erase command
will be disabled when OTP_LOCK bit is ‘1’
WRSR command will ignore the input data and program OTP_LOCK bit to 1.
User must clear the protect bits before enter OTP mode.
OTP sector can only be program and erase before OTP_LOCK bit is set to ‘1’ and BP [3:0] = ‘0000’. In
OTP mode, user can read other sectors, but program/erase other sectors only allowed when
OTP_LOCK bit equal to ‘0’.
User can use WRDI (04h) command to exit OTP mode.
Erase OTP Command (20h)
User can use Sector Erase (20h) command only to erase OTP data.
Table 7. OTP Sector Address
Sector
1023
Sector Size
512 byte
Address Range
3FF000h – 3FF1FFh
Note: The OTP sector is mapping to sector 1023
This Data Sheet may be revised by subsequent versions
28 ^{©2004 Eon Silicon Solution, Inc.,}
or modifications due to changes in technical specifications.
Rev. G, Issue Date: 2009/10/16
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