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[/] [mkjpeg/] [trunk/] [design/] [BufFifo/] [BUF_FIFO.vhd] - Diff between revs 31 and 40
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| Rev 31 |
Rev 40 |
| Line 187... |
Line 187... |
last_idx <= (others => '0');
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last_idx <= (others => '0');
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else
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else
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last_idx <= unsigned(img_size_x(15 downto 3))-1;
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last_idx <= unsigned(img_size_x(15 downto 3))-1;
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end if;
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end if;
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if last_idx > 0 then
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if C_MEMORY_OPTIMIZED = 0 then
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if C_MEMORY_OPTIMIZED = 0 then
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if unsigned(fifo_count(to_integer(last_idx)-2)) > to_unsigned(128-2*8,8) then
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if unsigned(fifo_count(to_integer(wblock_cnt))) > to_unsigned(128-2*8,8) then
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fifo_almost_full <= '1';
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fifo_almost_full <= '1';
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else
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else
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fifo_almost_full <= '0';
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fifo_almost_full <= '0';
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end if;
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end if;
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else
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else
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fifo_almost_full <= fifo_full(to_integer(last_idx));
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if unsigned(fifo_count(to_integer(wblock_cnt))) >= to_unsigned(62,8) then
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fifo_almost_full <= '1';
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-- due to FIFO full latency next subFIFO is in danger of being
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-- overwritten thus its fifo full must be checked ahead
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else
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-- next=0 when current is last
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if wblock_cnt = last_idx then
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-- latency from FIFO full till it is recognized by Host is 2T (64-2)=62
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if unsigned(fifo_count(0)) >= to_unsigned(62,8) then
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fifo_almost_full <= '1';
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else
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fifo_almost_full <= '0';
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end if;
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end if;
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-- next is just current+1
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else
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-- latency from FIFO full till it is recognized by Host is 2T (64-2)=62
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if unsigned(fifo_count(to_integer(wblock_cnt)+1)) >= to_unsigned(62,8) then
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fifo_almost_full <= '1';
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else
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fifo_almost_full <= '0';
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end if;
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end if;
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end if;
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end if;
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end if;
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end if;
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end if;
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end process;
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end process;
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