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4.1.3.1. LDPC IP Core Backpressure
The LDPC IP core allows you to use backpressure.
When out_ready goes low, the FIFO buffer stores the data produced by the encoder. If the FIFO buffer is almost full, it sends a signal that sets in_ready to low and stops the flow of input data from the source. At that point if out_ready goes high once again, the FIFO buffer outputs the stored data until it is almost empty. Then it sets in_ready to high to produce more data.