XC2S50 Xilinx, Inc., XC2S50 Datasheet - Page 11

• Manufacturer Part Number: XC2S50
• Description: Spartan-II 2.5V FPGA Family
• Manufacturer: Xilinx, Inc.

Spartan-II 2.5V FPGA Family: Functional Description
In addition to Clock and Clock Enable signals, each slice
has synchronous set and reset signals (SR and BY). SR
forces a storage element into the initialization state speci-
fied for it in the configuration. BY forces it into the opposite
state. Alternatively, these signals may be configured to
operate asynchronously.
All control signals are independently invertible, and are
shared by the two flip-flops within the slice.
Module 2 of 4
4
Figure 3: Spartan-II CLB Slice (two identical slices in each CLB)
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Additional Logic
The F5 multiplexer in each slice combines the function gen-
erator outputs. This combination provides either a function
generator that can implement any 5-input function, a 4:1
multiplexer, or selected functions of up to nine inputs.
Similarly, the F6 multiplexer combines the outputs of all four
function generators in the CLB by selecting one of the
F5-multiplexer outputs. This permits the implementation of
any 6-input function, an 8:1 multiplexer, or selected func-
tions of up to 19 inputs.
DS001-2 (v2.2) September 3, 2003
Product Specification
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