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Spartan-IIE FPGA Family:
Functional Description
DS077-2 (v2.3) June 18, 2008
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Product Specification
As can be seen in Figure 3, the CLBs form the central logic
structure with easy access to all support and routing struc-
tures. The IOBs are located around all the logic and mem-
ory elements for easy and quick routing of signals on and off
the chip.
Architectural Description
Spartan-IIE FPGA Array
The Spartan®-IIE user-programmable gate array, shown in
Figure 3, is composed of five major configurable elements:
Values stored in static memory cells control all the config-
urable logic elements and interconnect resources. These
values load into the memory cells on power-up, and can
reload if necessary to change the function of the device.
•
IOBs provide the interface between the package pins
and the internal logic
•
CLBs provide the functional elements for constructing
most logic
Each of these elements will be discussed in detail in the fol-
lowing sections.
•
•
Dedicated block RAM memories of 4096 bits each
Clock DLLs for clock-distribution delay compensation
and clock domain control
•
Versatile multi-level interconnect structure
DLL
DLL
CLBs
CLBs
CLBs
CLBs
DLL
DLL
I/O LOGIC
DS077_01_052102
Figure 3: Basic Spartan-IIE Family FPGA Block Diagram
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DS077-2 (v2.3) June 18, 2008
www.xilinx.com
9
Product Specification
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