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[/] [neorv32/] [trunk/] [rtl/] [core/] [neorv32_trng.vhd] - Diff between revs 2 and 3
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| Rev 2 |
Rev 3 |
| Line 248... |
Line 248... |
-- check groups of two non-overlapping bits from the input stream
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-- check groups of two non-overlapping bits from the input stream
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tmp_v := db_state & rnd_sync(2 downto 1);
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tmp_v := db_state & rnd_sync(2 downto 1);
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case tmp_v is
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case tmp_v is
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when "101" => db_enable <= '1'; db_data <= '1'; -- rising edge -> '1'
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when "101" => db_enable <= '1'; db_data <= '1'; -- rising edge -> '1'
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when "110" => db_enable <= '1'; db_data <= '0'; -- falling edge -> '0'
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when "110" => db_enable <= '1'; db_data <= '0'; -- falling edge -> '0'
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when others => db_enable <= '0'; db_data <= '-'; -- invalid
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when others => db_enable <= '0'; db_data <= '0'; -- invalid
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end case;
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end case;
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end process debiasing;
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end process debiasing;
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-- new valid byte available? --
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-- new valid byte available? --
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new_sample <= '1' when (rnd_cnt = "10000") and (rnd_enable = '1') and (db_enable = '1') else '0';
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new_sample <= '1' when (rnd_cnt = "10000") and (rnd_enable = '1') and (db_enable = '1') else '0';
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