EN27LN1G08 Datasheet, PDF (33/41 Pages) Eon Silicon Solution Inc. – 1 Gigabit (128 M x 8), 3.3 V NAND Flash Memory

One-Time Programmable (OTP) Operations
EN27LN1G08
This Eon flash device offers one-time programmable memory area. Thirty full pages of OTP data are
available on the device, and the entire range is guaranteed to be good. The OTP area is accessible only
through the OTP commands.
The OTP area leaves the factory in an unwritten state. The OTP area cannot be erased, whether it is
protected or not. Protecting the OTP area prevents further programming of that area.
The OTP area is only accessible while in OTP operation mode. To set the device to OTP operation
mode, issue the Set Feature (EFh-90h-01h) command. When the device is in OTP operation mode,
subsequent Read and/or Page Program are applied to the OTP area. When you want to come back to
normal operation, you need to use EFh-90h-00h for OTP mode release. Otherwise, device will
stay in OTP mode.
To program an OTP page, issue the Serial Data Input (80h) command followed by 4 address cycles.
The first two address cycles are column address that must be set as 00h. For the third cycle, select a
page in the range of 00h through 1Dh. The fourth and fifth cycle is fixed at 00h. Next, up to 2,112 bytes
of data can be loaded into data register. The bytes other than those to be programmed do not need to
be loaded. Random Data Input (85h) command in this device is prohibited. The Page Program confirms
(10h) command initiates the programming process. The internal control logic automatically executes the
programming algorithm, timing and verification. Please note that no partial-page program is allowed in
the OTP area. In addition, the OTP pages must be programmed in the ascending order. A programmed
OTP page will be automatically protected.
Similarly, to read data from an OTP page, set the device to OTP operation mode and then issue the
Read (00h-30h) command. The first two address cycles are column address that must be set as 00h
and Random Data Output (05h-E0h) command is prohibited as well.
All pages in the OTP area will be protected simultaneously by issuing the Set Feature (EFh-90h-03h)
command to set the device to OTP protection mode. After the OTP area is protected, no page in the
area is programmable and the whole area cannot be unprotected.
The Read Status (70h) command is the only valid command for reading status in OTP operation mode.
Table 2. OTP Modes and Commands
OTP Operation mode
Read
Page Program
Set Feature
EFh-90h¹-01h²
EFh-90h-01h
OTP Protection mode
Program Protect
EFh-90h-03h
OTP Release mode
Leave OTP mode
Note:
1. 90h is OTP status register address.
2. 00h, 01h, and 03h are OTP status register data values.
EFh-90h-00h
Command
00h-30h
80h-10h
80h-10h
Table 3. OTP Area Details
Description
Number of OTP pages
OTP pages address
Number of partial page programs for each page in the OTP area
Value
30
00h – 1Dh
1
This Data Sheet may be revised by subsequent versions
or modifications due to changes in technical specifications.
©2013 Eon Silicon Solution, Inc., www.eonssi.com
Rev. C, Issue Date: 2013/10/03