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In-circuit debug of FPGAs presents several challenges. FPGA clock speeds can run in excess of 200 MHz, and multiple circuits running at different clock speeds can exist within a single FPGA. BGA packaging, popular for FPGAs, makes probing challenging due to its compact size. Signals that were previously available on the board may exist exclusively as nodes within the FPGA, making it time consuming to gain visibility across critical internal circuit interactions.
For sophisticated FPGA designs, a logic analyzer makes system-level, functional debug possible. For correlation of analog phenomena with digital signals inside the FPGA, the MSO is the only tool capable. For correlation of digital signals inside the FPGA with external system busses for full functional debug, the logic analyzer is the tool of choice.
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