XC3S400AN-4FTG256I Xilinx Inc, XC3S400AN-4FTG256I Datasheet - Page 83

• Manufacturer Part Number: XC3S400AN-4FTG256I
• Description: IC FPGA SPARTAN-3AN 256FTBGA
• Manufacturer: Xilinx Inc
• Series: Spartan™-3ANr

Specifications of XC3S400AN-4FTG256I

• Number Of Logic Elements/cells: 8064
• Number Of Labs/clbs: 896
• Total Ram Bits: 368640
• Number Of I /o: 195
• Number Of Gates: 400000
• Voltage - Supply: 1.14 V ~ 1.26 V
• Mounting Type: Surface Mount
• Operating Temperature: -40°C ~ 100°C
• Package / Case: 256-LBGA
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Security Register
Security Register
Table 9-1: Security Register Contents
Security Register Program
Spartan-3AN FPGA In-System Flash User Guide
UG333 (v2.1) January 15, 2009
Description
Number of
Programming Cycles
R
Byte
The Spartan
Security Register, shown in
The 128 bytes are further divided into two subfields.
•
•
The Security Register serves a variety of potential applications, such as uniquely
identifying a particular ISF memory device, for protecting FPGA bitstreams or user data,
or for locked key storage. Applications and usage are similar to that for the FPGA Device
DNA register. See the Protecting FPGA Designs chapter in
Configuration User
Only the User-Defined Field in the Security Register is programmable. This field does not
need to be erased before it is programmed.
(this field is one-time programmable, OTP)
The User-Defined Field (byte locations 0 through 63), can be programmed with any
value at any time, but it can only be programmed once. In other words, this field is
one-time programmable (OTP). The default delivered state is erased, and all locations
are 0xFF.
Caution!
changed.
The Unique Identifier (byte locations 64 through 127) is programmed during Xilinx
factory manufacturing and contains a unique identifier per each ISF memory. This
field is different from the Device DNA feature accessible within Spartan-3A and
Spartan-3AN FPGAs. The factory-programmed data cannot be erased or changed.
0
User-Defined Field (64 bytes)
64 bytes of user-defined data
®
-3AN FPGA In-System Flash (ISF) memory includes a special 128-byte
Once the 64-byte User-Defined Field is programmed, it cannot be erased or
1
Guide.
1
www.xilinx.com
Table
...
Security Register (128 bytes)
9-1.
63
(this field is permanently programmed
Unique identifier for each ISF memory
64
inside each Spartan-3AN FPGA
during Xilinx manufacturing)
Factory ID (64 bytes)
UG332, Spartan-3 Generation
65
0
Chapter 9
...
127
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