Achronix Speedster22i SerDes Uživatelský manuál stáhnout pdf (Strana 29)

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/Removal” upon 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

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Achronix Speedster22i SerDes Uživatelský manuál Strana 29