Block RAM (BRAM) is a type of
random access memory embedded throughout an FPGA for data storage.
You can use BRAM to accomplish the following tasks:
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Transfer data between multiple clock domains by using local FIFOs
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Transfer data between an FPGA target and a host processor by using a DMA FIFO
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Transfer data between FPGA targets by using a peer-to-peer FIFO
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Store large data sets on an FPGA target more efficiently than RAM built from look-up tables