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-- $Id: pdp11_abox.vhd 314 2010-07-09 17:38:41Z mueller $
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-- $Id: pdp11_ounit.vhd 330 2010-09-19 17:43:53Z mueller $
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--
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--
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-- Copyright 2006-2007 by Walter F.J. Mueller <W.F.J.Mueller@gsi.de>
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-- Copyright 2006-2007 by Walter F.J. Mueller <W.F.J.Mueller@gsi.de>
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--
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--
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-- This program is free software; you may redistribute and/or modify it under
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-- This program is free software; you may redistribute and/or modify it under
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-- the terms of the GNU General Public License as published by the Free
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-- the terms of the GNU General Public License as published by the Free
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-- WITHOUT ANY WARRANTY, without even the implied warranty of MERCHANTABILITY
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-- WITHOUT ANY WARRANTY, without even the implied warranty of MERCHANTABILITY
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-- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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-- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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-- for complete details.
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-- for complete details.
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--
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--
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------------------------------------------------------------------------------
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------------------------------------------------------------------------------
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-- Module Name: pdp11_abox - syn
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-- Module Name: pdp11_ounit - syn
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-- Description: pdp11: arithmetic unit for addresses (abox)
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-- Description: pdp11: arithmetic unit for addresses (ounit)
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--
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--
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-- Dependencies: -
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-- Dependencies: -
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-- Test bench: tb/tb_pdp11_core (implicit)
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-- Test bench: tb/tb_pdp11_core (implicit)
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-- Target Devices: generic
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-- Target Devices: generic
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-- Tool versions: xst 8.1, 8.2, 9.1, 9.2; ghdl 0.18-0.25
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-- Tool versions: xst 8.1, 8.2, 9.1, 9.2; ghdl 0.18-0.25
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-- Revision History:
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-- Revision History:
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-- Date Rev Version Comment
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-- Date Rev Version Comment
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-- 2010-09-18 300 1.1 renamed from abox
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-- 2007-06-14 56 1.0.1 Use slvtypes.all
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-- 2007-06-14 56 1.0.1 Use slvtypes.all
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-- 2007-05-12 26 1.0 Initial version
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-- 2007-05-12 26 1.0 Initial version
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------------------------------------------------------------------------------
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------------------------------------------------------------------------------
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library ieee;
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library ieee;
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use work.slvtypes.all;
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use work.slvtypes.all;
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use work.pdp11.all;
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use work.pdp11.all;
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-- ----------------------------------------------------------------------------
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-- ----------------------------------------------------------------------------
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entity pdp11_abox is -- arithmetic unit for addresses (abox)
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entity pdp11_ounit is -- offset adder for addresses (ounit)
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port (
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port (
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DSRC : in slv16; -- 'src' data for port A
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DSRC : in slv16; -- 'src' data for port A
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DDST : in slv16; -- 'dst' data for port A
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DDST : in slv16; -- 'dst' data for port A
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DTMP : in slv16; -- 'tmp' data for port A
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DTMP : in slv16; -- 'tmp' data for port A
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PC : in slv16; -- PC data for port A
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PC : in slv16; -- PC data for port A
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BSEL : in slv2; -- selector for port B
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BSEL : in slv2; -- selector for port B
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OPSUB : in slbit; -- operation: 0 add, 1 sub
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OPSUB : in slbit; -- operation: 0 add, 1 sub
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DOUT : out slv16; -- data output
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DOUT : out slv16; -- data output
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NZOUT : out slv2 -- NZ condition codes out
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NZOUT : out slv2 -- NZ condition codes out
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);
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);
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end pdp11_abox;
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end pdp11_ounit;
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architecture syn of pdp11_abox is
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architecture syn of pdp11_ounit is
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-- --------------------------------------
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-- --------------------------------------
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begin
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begin
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begin
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begin
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if AZERO = '0' then
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if AZERO = '0' then
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case ASEL is
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case ASEL is
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when c_abox_asel_dsrc => ma := DSRC;
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when c_ounit_asel_dsrc => ma := DSRC;
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when c_abox_asel_ddst => ma := DDST;
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when c_ounit_asel_ddst => ma := DDST;
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when c_abox_asel_dtmp => ma := DTMP;
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when c_ounit_asel_dtmp => ma := DTMP;
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when c_abox_asel_pc => ma := PC;
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when c_ounit_asel_pc => ma := PC;
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when others => null;
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when others => null;
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end case;
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end case;
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else
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else
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ma := (others=>'0');
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ma := (others=>'0');
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end if;
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end if;
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case BSEL is
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case BSEL is
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when c_abox_bsel_ireg6 => mb := "000000000" & IREG8(5 downto 0) & "0";
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when c_ounit_bsel_ireg6 => mb := "000000000" & IREG8(5 downto 0) & "0";
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when c_abox_bsel_ireg8 => mb := IREG8(7) & IREG8(7) & IREG8(7) &
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when c_ounit_bsel_ireg8 => mb := IREG8(7) & IREG8(7) & IREG8(7) &
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IREG8(7) & IREG8(7) & IREG8(7) &
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IREG8(7) & IREG8(7) & IREG8(7) &
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IREG8(7) & IREG8 & "0";
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IREG8(7) & IREG8 & "0";
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when c_abox_bsel_vmdout => mb := VMDOUT;
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when c_ounit_bsel_vmdout => mb := VMDOUT;
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when c_abox_bsel_const => mb := "0000000" & CONST;
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when c_ounit_bsel_const => mb := "0000000" & CONST;
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when others => null;
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when others => null;
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end case;
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end case;
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if OPSUB = '0' then
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if OPSUB = '0' then
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sum := unsigned(ma) + unsigned(mb);
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sum := unsigned(ma) + unsigned(mb);
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