EN25S80 Datasheet, PDF (25/37 Pages) Eon Silicon Solution Inc. – 8 Megabit 1.8V Serial Flash Memory with 4Kbyte Uniform Sector

EN25S80
When Chip Select is driven High, the device is put in the Standby Power mode. Once in the Standby
Power mode, the device waits to be selected, so that it can receive, decode and execute instructions.
Figure 21. Read Identification (RDID)
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 255, 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.
Erase OTP Command (20h)
User can use Sector Erase (20h) command only to erase OTP data.
Table 7. OTP Sector Address
Sector
Sector Size
Address Range
255
256 byte
0FF000h – 0FF0FFh
Note: The OTP sector is mapping to sector 255
This Data Sheet may be revised by subsequent versions
25
or modifications due to changes in technical specifications.
©2004 Eon Silicon Solution, Inc.,
Rev. D, Issue Date: 2009/05/15
www.eonssi.com