CLB (configurable logic blocks)

Digital designs are spread over an array of CLBs, Figure 186, which are configured to implement the required logical and state machine functionality. XC4000 series devices have 100 CLBs in a 10 x 10 matrix. Each CLB has the following configurable features:

2 independent 4-input combinational logic functions (implemented as look-up tables).
2 D flip-flops

**Figure 186:** Configurable logic block.
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ANU Engineering - ENGN2211