Achronix Speedster22i SerDes Manual de usuario Pagina 29

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EFIFO Operation
Figure 15: EFIFO SKP Addition/Removal
illustrates the process of SKP addition/removal.
Figure 15: EFIFO SKP Addition/Removal
In Figure 15: EFIFO SKP Addition/Removalupon reset, the difference between the read
and write counters is equal to fifo_mid (half the size of the buffer; default 16).
If clk_in is operating at a lower frequency than clk_out, then the read operation is faster than
the write operation and the difference between the write and read counters will be less than
fifo_mid. In this case, to compensate for clk_in being slower, an SKP is added to the data
stream.
If clk_in is operating at a higher frequency than clk_out, then the read operation is slower
than the write operation and the difference between the write and read counters will be
greater than fifo_mid. In this case, to compensate for clk_out being slower, an SKP is
removed from the data stream.
UG028, July 1, 2014
29
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