ESMT
F49L320UA/F49L320BA
Operation Temperature Condition -40°C~85°C
Factory Locked : Secured Silicon Sector
Programmed and Protected at the Factory
Customer Lockable : Secured Silicon Sector
NOT Programmed or Protected at the Factory
The Secured Silicon Sector feature provides a
256 –byte Flash memory region that enables
permanent part identification through an Electronic
Serial Number (ESN). The Secured Silicon Sector
uses a Secured Silicon Sector Indicator Bit (DQ7) to
indicate whether or not the Secured Silicon Sector is
locked when shipped from the factory. Factory
Locked version the Bit( DQ7) set to 1, Customer
Lockable version the Bit (DQ7) set to 0.
The customer lockable version allows the Secured
Silicon Sector to be programmed once, and then
permanently locked after it ships. Note that the
accelerated programming (ACC) is not available
when programming the Secured Silicon Sector.
The Secured Silicon Sector area can be protected
using the following procedures:
In a factory locked device, the Secured Silicon Sector
cannot be modified in any way. The device is
available pre-programmed with one of the following:
Write the three-cycle Enter Secured silicon
Region command sequence, and then follow the
in-system sector protect algorithm as shown in
Figure 16. of page41, except that RESET# may
be either VIH or VID. This allows in system protection
of the Secured Silicon Sector without raising any
device pin to a high voltage. Note that this
method is only applicable to the Secured silicon
Sector.
1. A random, secure ESN only.
2. Customer code through the Express Flash
service.
3. Both a random, secure ESN and customer code
through the Express Flash device.
To verify the protect/unprotect status of the
Secured Silicon Sector, follow the algorithm
shown in below table.
In device that have an ESN, a Bottom Boot device
has the 16-byte (8-word) ESN in sector 0 at address
00000H-0000FH in byte mode(or 00000H~00007H in
word mode).In the Top Boot device, the ECN is in
sector 70 at addresses 3FFF00h-3FFF0Fh in byte
mode ( or 1FFF80h-1FFF87h in word mode). In the
uniform device, the ESN is in sector 63 at addresses
3FFF00h-3FFF0Fh in byte mode (or 1FFF80h-
1FFF87h in word mode).
Once the Secured Silicon Sector protection must
be used with caution since, once protected, there
is no procedure available for unprotecting the
Secured silicon Sector area, and none of the bits
in the Secured Silicon Sector memory space can
be modified in any way.
Customers may opt to have their code programmed
by ESMT through the Express-Flash service. ESMT
programs the customer’s code, with or without the
random ESN. The devices are then shipped from the
ESMT factory with the Secured Silicon Sector locked.
Note:
1. After entering Secured Silicon Sector mode, user
can program Secured Silicon Sector (means to
write ESN code) and do Secured Silicon Sector
protection once when device is customer
lockable version.
2. Enter Secured Silicon Sector mode, the under
functions are not allowed except for CFI.
a. Sector Erase/Erase Suspend/Resume.
b. Chip Erase.
3. Secured Silicon Sector mode doesn’t have
“Erase” and “Unprotect” function.
Elite Semiconductor Memory Technology Inc.
Publication Date : Sep. 2008
Revision: 1.1
20/55
ESMT [ ELITE SEMICONDUCTOR MEMORY TECHNOLOGY INC. ]
