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-- std_logic_1164
-- Copyright (C) 2020 Tristan Gingold
--
-- This file is part of GHDL.
--
-- This program is free software: you can redistribute it and/or modify
-- it under the terms of the GNU General Public License as published by
-- the Free Software Foundation, either version 2 of the License, or
-- (at your option) any later version.
--
-- This program is distributed in the hope that it will be useful,
-- but WITHOUT ANY WARRANTY; without even the implied warranty of
-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-- GNU General Public License for more details.
--
-- You should have received a copy of the GNU General Public License
-- along with this program. If not, see <gnu.org/licenses>.
package body Synth.Ieee.Std_Logic_1164 is
function Read_Bit (M : Memory_Ptr; Off : Uns32) return Bit is
begin
return Bit'Val (Read_U8 (M + Size_Type (Off)));
end Read_Bit;
procedure Write_Bit (M : Memory_Ptr; Off : Uns32; Val : Bit) is
begin
Write_U8 (M + Size_Type (Off), Bit'Pos (Val));
end Write_Bit;
function Read_Std_Logic (M : Memory_Ptr; Off : Uns32) return Std_Ulogic is
begin
return Std_Ulogic'Val (Read_U8 (M + Size_Type (Off)));
end Read_Std_Logic;
procedure Write_Std_Logic (M : Memory_Ptr; Off : Uns32; Val : Std_Ulogic) is
begin
Write_U8 (M + Size_Type (Off), Std_Ulogic'Pos (Val));
end Write_Std_Logic;
function To_Bit (S : Std_Ulogic; Xmap : Bit) return Bit is
begin
case S is
when '0' | 'L' => return '0';
when '1' | 'H' => return '1';
when others => return Xmap;
end case;
end To_Bit;
function Read_Bit_To_Std_Logic (M : Memory_Ptr; Off : Uns32)
return Std_Ulogic is
begin
case Read_U8 (M + Size_Type (Off)) is
when 0 =>
return '0';
when 1 =>
return '1';
when others =>
raise Constraint_Error;
end case;
end Read_Bit_To_Std_Logic;
end Synth.Ieee.Std_Logic_1164;
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