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参数资料
| 型号： | S29JL032H60TAI023 |
| 厂商： | ADVANCED MICRO DEVICES INC |
| 元件分类： | PROM |
| 英文描述： | 2M X 16 FLASH 3V PROM, 60 ns, PDSO48 |
| 封装： | MO-142DD, TSOP-48 |
| 文件页数： | 21/66页 |
| 文件大小： | 1691K |
| 代理商： | S29JL032H60TAI023 |
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S29JL032H
S29JL032H_00A11 March 10, 2005
Advan ce
In form ati o n
SecSi (Secured Silicon) Sector
Flash Memory Region
The SecSi (Secured Silicon) Sector feature provides a Flash memory region that
enables permanent part identification through an Electronic Serial Number
(ESN). The SecSi Sector is 256 bytes in length, and uses a SecSi Sector Indicator
Bit (DQ7) to indicate whether or not the SecSi Sector is locked when shipped from
the factory. This bit is permanently set at the factory and cannot be changed,
which prevents cloning of a factory locked part. This ensures the security of the
ESN once the product is shipped to the field.
The product is available with the SecSi Sector either factory locked or customer
lockable. The factory-locked version is always protected when shipped from the
factory, and has the SecSi Sector Indicator Bit permanently set to a “1.” The cus-
tomer-lockable version is shipped with the SecSi Sector unprotected, allowing
customers to utilize that sector in any manner they choose. The customer-lock-
able version has the SecSi Sector Indicator Bit permanently set to a “0.” Thus,
the SecSi Sector Indicator Bit prevents customer-lockable devices from being
used to replace devices that are factory locked. The SecSi Customer Indicator Bit
(DQ6) is permanently set to 1 if the part has been customer locked, permanently
set to 0 if the part has been factory locked, and is 0 if customer lockable.
The system accesses the SecSi Secure through a command sequence (see “Enter
SecSi Sector/Exit SecSi Sector Command Sequence”). After the system has
written the Enter SecSi Sector command sequence, it may read the SecSi Sector
by using the addresses normally occupied by the boot sectors. This mode of op-
eration continues until the system issues the Exit SecSi Sector command
sequence, or until power is removed from the device. On power-up, or following
a hardware reset, the device reverts to sending commands to the first 256 bytes
of Sector 0. Note that the ACC function and unlock bypass modes are not avail-
able when the SecSi Sector is enabled.
Factory Locked: SecSi Sector Programmed and Protected At the
Factory
In a factory locked device, the SecSi Sector is protected when the device is
shipped from the factory. The SecSi Sector cannot be modified in any way. The
device is preprogrammed with both a random number and a secure ESN. The 8-
word random number is at addresses 000000h–000007h in word mode (or
000000h–00000Fh in byte mode). The secure ESN is programmed in the next 8
words at addresses 000008h–00000Fh (or 000010h–00001Fh in byte mode). The
device is available preprogrammed with one of the following:
A random, secure ESN only
Customer code through Spansion programming services
Both a random, secure ESN and customer code through Spansion program-
ming services
Contact your local sales office for details on using Spansion programming
services.
Customer Lockable: SecSi Sector NOT Programmed or Protected
At the Factory
If the security feature is not required, the SecSi Sector can be treated as an ad-
ditional Flash memory space. The SecSi Sector can be read any number of times,
but can be programmed and locked only once. Note that the accelerated pro-
gramming (ACC) and unlock bypass functions are not available when
programming the SecSi Sector.
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