| Line 247... |
Line 247... |
when AS_IMM => L_BASE <= I_IMM;
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when AS_IMM => L_BASE <= I_IMM;
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when others => L_BASE <= X"0000";
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when others => L_BASE <= X"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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-- the value of the X/Y/Z/SP register after a potential PRE-decrement
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-- the value of the X/Y/Z/SP register after a potential PRE-inc/decrement
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-- (by 1 or 2) and POST-increment (by 1 or 2).
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-- (by 1 or 2) and POST-inc/decrement (by 1 or 2).
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--
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--
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process(I_AMOD(5 downto 3), I_IMM)
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process(I_AMOD, I_IMM)
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begin
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begin
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case I_AMOD(5 downto 3) is
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case I_AMOD is
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when AO_0 => L_PRE <= X"0000"; L_POST <= X"0000";
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when AMOD_Xq | AMOD_Yq | AMOD_Zq =>
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when AO_i => L_PRE <= X"0000"; L_POST <= X"0001";
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L_PRE <= I_IMM; L_POST <= X"0000";
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when AO_ii => L_PRE <= X"0000"; L_POST <= X"0002";
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when AO_q => L_PRE <= I_IMM; L_POST <= X"0000";
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when AMOD_Xi | AMOD_Yi | AMOD_Zi =>
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when AO_d => L_PRE <= X"FFFF"; L_POST <= X"FFFF";
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L_PRE <= X"0000"; L_POST <= X"0001";
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when AO_dd => L_PRE <= X"FFFE"; L_POST <= X"FFFE";
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when others => L_PRE <= X"0000"; L_POST <= X"0000";
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when AMOD_dX | AMOD_dY | AMOD_dZ =>
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L_PRE <= X"FFFF"; L_POST <= X"FFFF";
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when AMOD_iSP =>
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L_PRE <= X"0001"; L_POST <= X"0001";
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when AMOD_iiSP=>
|
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L_PRE <= X"0001"; L_POST <= X"0002";
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when AMOD_SPd =>
|
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L_PRE <= X"0000"; L_POST <= X"FFFF";
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when AMOD_SPdd=>
|
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L_PRE <= X"FFFF"; L_POST <= X"FFFE";
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when others =>
|
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L_PRE <= X"0000"; L_POST <= X"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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L_XYZS <= L_BASE + L_POST;
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L_XYZS <= L_BASE + L_POST;
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L_ADR <= L_BASE + L_PRE;
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L_ADR <= L_BASE + L_PRE;
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