EN25QH128A Datasheet, PDF (53/75 Pages) Eon Silicon Solution Inc. – 128 Megabit Serial Flash Memory with 4Kbyte Uniform Sector

EN25QH128A
Figure 34.1. Read Identification (RDID) in QPI 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 4095,
SRP bit becomes OTP_LOCK bit and can be read with RDSR command. The Chip Erase, Bank Erase
and Half Bank Erase commands are also disabled.
In OTP mode, user can read other sectors, but program/erase other sectors only allowed when
OTP_LOCK bit equal to ‘0’.
WRSR command will ignore the input data and program OTP_LOCK bit to 1.
User can use WRDI (04h) command to exit OTP mode.
The instruction sequence is shown in Figure 35.1 while using the Enable Quad Peripheral Interface
mode (EQPI) (38h) command.
Erase OTP Command (20h)
User only can use Sector Erase (20h) command to erase OTP data.
Table 11. OTP Sector Address
Sector
Sector Size
Address Range
4095
512 byte
FFF000h – FFF1FFh
Note: The OTP sector is mapping to sector 4095
This Data Sheet may be revised by subsequent versions
53
or modifications due to changes in technical specifications.
©2014 Eon Silicon Solution, Inc.,
Rev. C, Issue Date: 2014/01/22
www.eonssi.com