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[/] [mlite/] [trunk/] [vhdl/] [bus_mux.vhd] - Diff between revs 43 and 75
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| Rev 43 |
Rev 75 |
| Line 47... |
Line 47... |
-- type c_source_type is (c_from_null, c_from_alu, c_from_shift,
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-- type c_source_type is (c_from_null, c_from_alu, c_from_shift,
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-- c_from_mult, c_from_memory, c_from_pc, c_from_imm_shift16,
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-- c_from_mult, c_from_memory, c_from_pc, c_from_imm_shift16,
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-- c_from_reg_source_nez, c_from_reg_source_eqz);
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-- c_from_reg_source_nez, c_from_reg_source_eqz);
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amux: process(reg_source, imm_in, a_mux, c_pc)
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amux: process(reg_source, imm_in, a_mux, c_pc)
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begin
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begin
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a_out(31 downto 5) <= reg_source(31 downto 5);
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case a_mux is
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case a_mux is
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when a_from_reg_source =>
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when a_from_reg_source =>
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a_out(4 downto 0) <= reg_source(4 downto 0);
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a_out <= reg_source;
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when a_from_imm10_6 =>
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when a_from_imm10_6 =>
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a_out(31 downto 5) <= ZERO(31 downto 5);
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a_out(4 downto 0) <= imm_in(10 downto 6);
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a_out(4 downto 0) <= imm_in(10 downto 6);
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when others => --a_from_pc
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when others => --a_from_pc
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a_out <= c_pc;
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a_out <= c_pc;
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end case;
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end case;
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end process;
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end process;
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