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Reference.org
Logic block
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<p> In <a href="/facts/Computing/Kghtm9fX">computing</a>, a logic block or configurable logic block (CLB) is a fundamental building block of <a href="/facts/Field-programmable_gate_array/M8LSGcAU">field-programmable gate array</a> (FPGA) technology. Logic blocks can be configured by the engineer to provide <a href="/facts/Reconfigurable_computing/J4b2JsRB">reconfigurable</a> <a href="/facts/Logic_gate/RHLulvKI">logic gates</a>. </p><p>Logic blocks are the most common FPGA architecture, and are usually laid out within a logic block array. Logic blocks require I/O pads (to interface with external signals), and routing channels (to interconnect logic blocks). </p><p>Programmable logic blocks were invented by David W. Page and LuVerne R. Peterson, and defined within their 1985 patents. </p>