XC2S100E-7PQ208C Xilinx, Inc., XC2S100E-7PQ208C Datasheet - Page 10

• Manufacturer Part Number: XC2S100E-7PQ208C
• Description: 100000 SYSTEM GATE 1.8 VOLT FPGA - NOT RECOMMENDED for NEW DESIGN
• Manufacturer: Xilinx, Inc.

Storage Elements
Storage elements in the Spartan-II FPGA slice can be
configured either as edge-triggered D-type flip-flops or as
level-sensitive latches. The D inputs can be driven either by
function generators within the slice or directly from slice
inputs, bypassing the function generators.
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
specified for it in the configuration. BY forces it into the
DS001-2 (v2.8) June 13, 2008
Product Specification
R
Figure 4: Spartan-II CLB Slice (two identical slices in each CLB)
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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.
Additional Logic
The F5 multiplexer in each slice combines the function
generator 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.
Spartan-II FPGA Family: Functional Description
Module 2 of 4
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