EN25T16A Datasheet, PDF (24/35 Pages) Eon Silicon Solution Inc. – 16 Megabit Uniform Sector, Serial Flash Memory

EN25T16A
Figure 20. Enter EXT Mode
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 511, 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 [2:0] = ‘000’. 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.
While in OTP mode, user can use Sector Erase (20h) command only to erase OTP data.
Table 8. OTP Sector Address
Sector
511
Sector Size
512 byte
Address Range
1FF000h – 1FF1FFh
Note: The OTP sector is mapping to sector 511
Figure 21. Enter OTP Mode
This Data Sheet may be revised by subsequent versions
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or modifications due to changes in technical specifications.
©2004 Eon Silicon Solution, Inc.,
Rev. C, Issue Date: 2011/04/15
www.eonssi.com