EN27SN1G08 Datasheet, PDF (42/44 Pages) Eon Silicon Solution Inc. – 1 Gigabit (128 Mx 8), 1.8 V NAND Flash Memory

EN27SN1G08
One-Time Programmable (OTP) Operations
This 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. For the third cycle, select a page in the range of 00h
through 1Dh. The fourth 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. This device supports
Random Data Input (85h) command, which can be operated multiple times in a page. The column
address for the next data to be entered may be changed to the address follows the Random Data Input
command. The Page Program confirm (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 device may output random data (not in sequential order) in a page by
writing Random Data Output (05h-E0h) command, which can be operated multiple times in a page. The
column address for the next data to be output may be changed to the address follows the Random Data
Output command.
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.
OTP Modes and Commands
OTP Operation mode
OTP Protection mode
OTP Release mode
Set feature
Read
EFh-90h-01h
Page Program
EFh-90h-01h
Program Protect
EFh-90h-03h
Leave OTP mode
EFh-90h-00h
OTP Area Details
Description
Number of OTP pages
OTP page address
Number of partial page programs for each page in the OTP area
Command
00h-30h
80h-10h
80h-10h
Value
30
01h – 1Eh
1
This Data Sheet may be revised by subsequent versions
or modifications due to changes in technical specifications.
©2011 Eon Silicon Solution, Inc., www.eonssi.com
Rev. B, Issue Date: 2012/05/21