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constant AM_WS : std_logic_vector(3 downto 0) := '1' & AS_SP; -- SP ++/--
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constant AM_WS : std_logic_vector(3 downto 0) := '1' & AS_SP; -- SP ++/--
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-- address modes used
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-- address modes used
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--
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--
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constant AMOD_ABS : std_logic_vector(5 downto 0) := AO_0 & AS_IMM; -- IMM
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constant AMOD_ABS : std_logic_vector(5 downto 0) := AO_0 & AS_IMM; -- IMM
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constant AMOD_X : std_logic_vector(5 downto 0) := AO_0 & AS_X; -- (X)
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constant AMOD_X : std_logic_vector(5 downto 0) := AO_0 & AS_X; -- X
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constant AMOD_Xq : std_logic_vector(5 downto 0) := AO_Q & AS_X; -- (X+q)
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constant AMOD_Xq : std_logic_vector(5 downto 0) := AO_Q & AS_X; -- X+q
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constant AMOD_Xi : std_logic_vector(5 downto 0) := AO_i & AS_X; -- (X++)
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constant AMOD_Xi : std_logic_vector(5 downto 0) := AO_i & AS_X; -- X+
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constant AMOD_dX : std_logic_vector(5 downto 0) := AO_d & AS_X; -- (--X)
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constant AMOD_dX : std_logic_vector(5 downto 0) := AO_d & AS_X; -- -X
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constant AMOD_Y : std_logic_vector(5 downto 0) := AO_0 & AS_Y; -- (Y)
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constant AMOD_Y : std_logic_vector(5 downto 0) := AO_0 & AS_Y; -- Y
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constant AMOD_Yq : std_logic_vector(5 downto 0) := AO_Q & AS_Y; -- (Y+q)
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constant AMOD_Yq : std_logic_vector(5 downto 0) := AO_Q & AS_Y; -- Y+q
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constant AMOD_Yi : std_logic_vector(5 downto 0) := AO_i & AS_Y; -- (Y++)
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constant AMOD_Yi : std_logic_vector(5 downto 0) := AO_i & AS_Y; -- Y+
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constant AMOD_dY : std_logic_vector(5 downto 0) := AO_d & AS_Y; -- (--Y)
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constant AMOD_dY : std_logic_vector(5 downto 0) := AO_d & AS_Y; -- -Y
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constant AMOD_Z : std_logic_vector(5 downto 0) := AO_0 & AS_Z; -- (Z)
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constant AMOD_Z : std_logic_vector(5 downto 0) := AO_0 & AS_Z; -- Z
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constant AMOD_Zq : std_logic_vector(5 downto 0) := AO_Q & AS_Z; -- (Z+q)
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constant AMOD_Zq : std_logic_vector(5 downto 0) := AO_Q & AS_Z; -- Z+q
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constant AMOD_Zi : std_logic_vector(5 downto 0) := AO_i & AS_Z; -- (Z++)
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constant AMOD_Zi : std_logic_vector(5 downto 0) := AO_i & AS_Z; -- Z+
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constant AMOD_dZ : std_logic_vector(5 downto 0) := AO_d & AS_Z; -- (--Z)
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constant AMOD_dZ : std_logic_vector(5 downto 0) := AO_d & AS_Z; -- -Z
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constant AMOD_SPi : std_logic_vector(5 downto 0) := AO_i & AS_SP; -- (SP++)
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constant AMOD_iSP : std_logic_vector(5 downto 0) := AO_i & AS_SP; -- +SP
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constant AMOD_SPii: std_logic_vector(5 downto 0) := AO_ii & AS_SP; -- (SP++)
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constant AMOD_iiSP: std_logic_vector(5 downto 0) := AO_ii & AS_SP; -- ++SP
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constant AMOD_dSP : std_logic_vector(5 downto 0) := AO_d & AS_SP; -- (--SP)
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constant AMOD_SPd : std_logic_vector(5 downto 0) := AO_d & AS_SP; -- SP-
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constant AMOD_ddSP: std_logic_vector(5 downto 0) := AO_dd & AS_SP; -- (--SP)
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constant AMOD_SPdd: std_logic_vector(5 downto 0) := AO_dd & AS_SP; -- SP--
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-----------------------------------------------------------------------
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-- Stack pointer manipulations.
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--
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constant SP_NOP : std_logic_vector(2 downto 0) := "000";
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constant SP_ADD1: std_logic_vector(2 downto 0) := "001";
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constant SP_ADD2: std_logic_vector(2 downto 0) := "010";
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constant SP_SUB1: std_logic_vector(2 downto 0) := "011";
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constant SP_SUB2: std_logic_vector(2 downto 0) := "100";
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-----------------------------------------------------------------------
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-----------------------------------------------------------------------
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--
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--
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-- ALU multiplexers.
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-- ALU multiplexers.
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--
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--
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