| Line 12... |
Line 12... |
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entity select_yy is
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entity select_yy is
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Port( SY : in std_logic_vector( 3 downto 0);
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Port( SY : in std_logic_vector( 3 downto 0);
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IMM : in std_logic_vector(15 downto 0);
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IMM : in std_logic_vector(15 downto 0);
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QUICK : in std_logic_vector( 3 downto 0);
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QUICK : in std_logic_vector( 3 downto 0);
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M_RDAT : in std_logic_vector( 7 downto 0);
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RDAT : in std_logic_vector( 7 downto 0);
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IO_RDAT : in std_logic_vector( 7 downto 0);
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RR : in std_logic_vector(15 downto 0);
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RR : in std_logic_vector(15 downto 0);
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YY : out std_logic_vector(15 downto 0)
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YY : out std_logic_vector(15 downto 0)
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);
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);
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end select_yy;
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end select_yy;
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| Line 35... |
Line 34... |
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begin
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begin
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-- bits 1..0
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-- bits 1..0
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--
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--
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s_1_0: process(SY, IMM(1 downto 0), QUICK(1 downto 0), M_RDAT(1 downto 0),
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s_1_0: process(SY, IMM(1 downto 0), QUICK(1 downto 0), RDAT(1 downto 0),
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IO_RDAT(1 downto 0), RR(1 downto 0))
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RR(1 downto 0))
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begin
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begin
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case SY is
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case SY is
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when SY_I16 | SY_SI8
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when SY_I16 | SY_SI8
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| SY_UI8 => YY(1 downto 0) <= IMM (1 downto 0);
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| SY_UI8 => YY(1 downto 0) <= IMM (1 downto 0);
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when SY_RR => YY(1 downto 0) <= RR (1 downto 0);
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when SY_RR => YY(1 downto 0) <= RR (1 downto 0);
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when SY_SQ | SY_UQ => YY(1 downto 0) <= QUICK (1 downto 0);
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when SY_SQ | SY_UQ => YY(1 downto 0) <= QUICK (1 downto 0);
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when SY_SM | SY_UM => YY(1 downto 0) <= M_RDAT (1 downto 0);
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when SY_SM | SY_UM => YY(1 downto 0) <= RDAT (1 downto 0);
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when SY_IO => YY(1 downto 0) <= IO_RDAT(1 downto 0);
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when others => YY(1 downto 0) <= SY (1 downto 0);
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when others => YY(1 downto 0) <= SY (1 downto 0);
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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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-- bits 3..2
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-- bits 3..2
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--
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--
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s_3_2: process(SY, IMM(3 downto 2), QUICK(3 downto 2), M_RDAT(3 downto 2),
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s_3_2: process(SY, IMM(3 downto 2), QUICK(3 downto 2), RDAT(3 downto 2),
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IO_RDAT(3 downto 2), RR(3 downto 2))
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RR(3 downto 2))
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begin
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begin
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case SY is
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case SY is
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when SY_I16 | SY_SI8
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when SY_I16 | SY_SI8
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| SY_UI8 => YY(3 downto 2) <= IMM (3 downto 2);
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| SY_UI8 => YY(3 downto 2) <= IMM (3 downto 2);
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when SY_RR => YY(3 downto 2) <= RR (3 downto 2);
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when SY_RR => YY(3 downto 2) <= RR (3 downto 2);
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when SY_SQ | SY_UQ => YY(3 downto 2) <= QUICK (3 downto 2);
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when SY_SQ | SY_UQ => YY(3 downto 2) <= QUICK (3 downto 2);
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when SY_SM | SY_UM => YY(3 downto 2) <= M_RDAT (3 downto 2);
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when SY_SM | SY_UM => YY(3 downto 2) <= RDAT (3 downto 2);
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when SY_IO => YY(3 downto 2) <= IO_RDAT(3 downto 2);
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when others => YY(3 downto 2) <= "00";
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when others => YY(3 downto 2) <= "00";
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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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|
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-- bits 7..4
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-- bits 7..4
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--
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--
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s_7_4: process(SY, IMM(7 downto 4), QUICK(3), M_RDAT(7 downto 4),
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s_7_4: process(SY, IMM(7 downto 4), QUICK(3), RDAT(7 downto 4),
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IO_RDAT(7 downto 4), RR(7 downto 4))
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RR(7 downto 4))
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begin
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begin
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case SY is
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case SY is
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when SY_I16 | SY_SI8
|
when SY_I16 | SY_SI8
|
| SY_UI8 => YY(7 downto 4) <= IMM (7 downto 4);
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| SY_UI8 => YY(7 downto 4) <= IMM (7 downto 4);
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when SY_RR => YY(7 downto 4) <= RR (7 downto 4);
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when SY_RR => YY(7 downto 4) <= RR (7 downto 4);
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when SY_SQ => YY(7 downto 4) <= b4(QUICK(3));
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when SY_SQ => YY(7 downto 4) <= b4(QUICK(3));
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when SY_SM | SY_UM => YY(7 downto 4) <= M_RDAT (7 downto 4);
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when SY_SM | SY_UM => YY(7 downto 4) <= RDAT (7 downto 4);
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when SY_IO => YY(7 downto 4) <= IO_RDAT(7 downto 4);
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when others => YY(7 downto 4) <= "0000";
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when others => YY(7 downto 4) <= "0000";
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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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|
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-- bits 15..8
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-- bits 15..8
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--
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--
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s_15_8: process(SY, IMM(15 downto 7), QUICK(3), M_RDAT(7), RR(15 downto 8))
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s_15_8: process(SY, IMM(15 downto 7), QUICK(3), RDAT(7), RR(15 downto 8))
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begin
|
begin
|
case SY is
|
case SY is
|
when SY_I16 => YY(15 downto 8) <= IMM (15 downto 8);
|
when SY_I16 => YY(15 downto 8) <= IMM (15 downto 8);
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when SY_SI8 => YY(15 downto 8) <= b8(IMM(7));
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when SY_SI8 => YY(15 downto 8) <= b8(IMM(7));
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when SY_RR => YY(15 downto 8) <= RR(15 downto 8);
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when SY_RR => YY(15 downto 8) <= RR(15 downto 8);
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when SY_SQ => YY(15 downto 8) <= b8(QUICK(3));
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when SY_SQ => YY(15 downto 8) <= b8(QUICK(3));
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when SY_SM => YY(15 downto 8) <= b8(M_RDAT(7));
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when SY_SM => YY(15 downto 8) <= b8(RDAT(7));
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when others => YY(15 downto 8) <= "00000000";
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when others => YY(15 downto 8) <= "00000000";
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end case;
|
end case;
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end process;
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end process;
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|
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end Behavioral;
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end Behavioral;
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