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[/] [neorv32/] [trunk/] [rtl/] [core/] [neorv32_twi.vhd] - Diff between revs 48 and 65
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| Rev 48 |
Rev 65 |
| Line 188... |
Line 188... |
twi_sda_i_ff0 <= twi_sda_i;
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twi_sda_i_ff0 <= twi_sda_i;
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twi_sda_i_ff1 <= twi_sda_i_ff0;
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twi_sda_i_ff1 <= twi_sda_i_ff0;
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twi_scl_i_ff0 <= twi_scl_i;
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twi_scl_i_ff0 <= twi_scl_i;
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twi_scl_i_ff1 <= twi_scl_i_ff0;
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twi_scl_i_ff1 <= twi_scl_i_ff0;
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-- defaults --
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-- interrupt --
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if (arbiter = "100") then -- fire IRQ if enabled transceiver is idle
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irq_o <= '1';
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else
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irq_o <= '0';
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irq_o <= '0';
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end if;
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-- defaults --
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arbiter(2) <= ctrl(ctrl_twi_en_c); -- still activated?
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arbiter(2) <= ctrl(ctrl_twi_en_c); -- still activated?
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-- serial engine --
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-- serial engine --
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-- TWI bus signals are set/sampled using 4 clock phases
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-- TWI bus signals are set/sampled using 4 clock phases
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case arbiter is
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case arbiter is
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| Line 255... |
Line 261... |
twi_scl_o <= '0';
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twi_scl_o <= '0';
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end if;
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end if;
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if (twi_bitcnt = "1010") then -- 8 data bits + 1 bit for ACK + 1 tick delay
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if (twi_bitcnt = "1010") then -- 8 data bits + 1 bit for ACK + 1 tick delay
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arbiter(1 downto 0) <= "00"; -- go back to IDLE
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arbiter(1 downto 0) <= "00"; -- go back to IDLE
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irq_o <= '1'; -- fire IRQ
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end if;
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end if;
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when others => -- "0--" OFFLINE: TWI deactivated
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when others => -- "0--" OFFLINE: TWI deactivated
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twi_sda_o <= '1';
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twi_sda_o <= '1';
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twi_scl_o <= '1';
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twi_scl_o <= '1';
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