EN25QH256 Datasheet, PDF (55/74 Pages) Eon Silicon Solution Inc. – 256 Megabit Serial Flash Memory with 4Kbyte Uniform Sector

EN25QH256
Figure 30.1. Read Identification (RDID) under EQPI 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, 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’.
While in OTP mode, array access is not allowed.
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.
The instruction sequence is shown in Figure 31.1 while using the Enable Quad Peripheral Interface
mode (EQPI) (38h) command.
Table 8. OTP Sector Address
Sector Size
512 byte
Address Range
xxx000h – xxx1FFh
This Data Sheet may be revised by subsequent versions
55
or modifications due to changes in technical specifications.
©2004 Eon Silicon Solution, Inc.,
Rev. E, Issue Date: 2012/01/30
www.eonssi.com