This Data Sheet may be revised by subsequent versions ©2004 Eon Silicon Solution, Inc., www.eonssi.com
or modifications due to changes in technical specifications.
22
EN25F16
Rev. F, Issue Date: 2009/03/16
instruction sequence is shown in Figure 19. The Read Identification (RDID) instruction is terminated by
driving Chip Select High at any time during data output.
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 19. Read Identification (RDID)
Enter OTP Mode (3Ah)
This Flash has an extra 128 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 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 BP [2:0] = ‘000’. 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.
Table 7. OTP Sector Address
Sector
Sector Size
Address Range
511 128
byte
1FF000 – 1FF07Fh
Note:
The OTP sector is mapping to sector 511
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