| Line 1... |
Line 1... |
-- $Id: pdp11_decode.vhd 314 2010-07-09 17:38:41Z mueller $
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-- $Id: pdp11_decode.vhd 330 2010-09-19 17:43:53Z mueller $
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--
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--
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-- Copyright 2006-2008 by Walter F.J. Mueller <W.F.J.Mueller@gsi.de>
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-- Copyright 2006-2008 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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| Line 19... |
Line 19... |
-- 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 1.0.5 rename (adlm)box->(oalm)unit
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-- 2008-11-30 174 1.0.4 BUGFIX: add updt_dstadsrc; set for MFP(I/D)
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-- 2008-11-30 174 1.0.4 BUGFIX: add updt_dstadsrc; set for MFP(I/D)
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-- 2008-05-03 143 1.0.3 get fork_srcr,fork_dstr,fork_dsta assign out of if
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-- 2008-05-03 143 1.0.3 get fork_srcr,fork_dstr,fork_dsta assign out of if
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-- 2008-04-27 139 1.0.2 BUGFIX: mtp now via do_fork_op; is_dsta logic mods
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-- 2008-04-27 139 1.0.2 BUGFIX: mtp now via do_fork_op; is_dsta logic mods
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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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| Line 101... |
Line 102... |
nstat.op_mov := '0';
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nstat.op_mov := '0';
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nstat.trap_vec := "000";
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nstat.trap_vec := "000";
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nstat.force_srcsp := '0';
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nstat.force_srcsp := '0';
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nstat.updt_dstadsrc := '0';
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nstat.updt_dstadsrc := '0';
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|
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nstat.dbox_srcmod := c_dbox_mod_pass;
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nstat.aunit_srcmod := c_aunit_mod_pass;
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nstat.dbox_dstmod := c_dbox_mod_pass;
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nstat.aunit_dstmod := c_aunit_mod_pass;
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nstat.dbox_cimod := c_dbox_mod_pass;
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nstat.aunit_cimod := c_aunit_mod_pass;
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nstat.dbox_cc1op := '0';
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nstat.aunit_cc1op := '0';
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nstat.dbox_ccmode := IREG(8 downto 6); -- STATIC
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nstat.aunit_ccmode := IREG(8 downto 6); -- STATIC
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nstat.lbox_func := (others=>'0');
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nstat.lunit_func := (others=>'0');
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nstat.mbox_func := (others=>'0');
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nstat.munit_func := (others=>'0');
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nstat.res_sel := c_dpath_res_abox;
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nstat.res_sel := c_dpath_res_ounit;
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nstat.fork_op := (others=>'0');
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nstat.fork_op := (others=>'0');
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nstat.fork_srcr := (others=>'0');
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nstat.fork_srcr := (others=>'0');
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nstat.fork_dstr := (others=>'0');
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nstat.fork_dstr := (others=>'0');
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nstat.fork_dsta := (others=>'0');
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nstat.fork_dsta := (others=>'0');
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| Line 229... |
Line 230... |
nstat.is_res := '0';
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nstat.is_res := '0';
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is_dstm := '1';
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is_dstm := '1';
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nstat.fork_opg := c_fork_opg_gen;
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nstat.fork_opg := c_fork_opg_gen;
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nstat.do_fork_opg := '1';
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nstat.do_fork_opg := '1';
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nstat.do_pref_dec := is_dstmode0notpc;
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nstat.do_pref_dec := is_dstmode0notpc;
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nstat.lbox_func := c_lbox_func_swap;
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nstat.lunit_func := c_lunit_func_swap;
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nstat.res_sel := c_dpath_res_lbox;
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nstat.res_sel := c_dpath_res_lunit;
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end if;
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end if;
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|
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end if; -- OPBYTE='0' and OPEXT1="000"
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end if; -- OPBYTE='0' and OPEXT1="000"
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|
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if OPEXT1(2)='0' and -- BR class instructions
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if OPEXT1(2)='0' and -- BR class instructions
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| Line 263... |
Line 264... |
nstat.do_fork_op := '1';
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nstat.do_fork_op := '1';
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end if;
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end if;
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|
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if OPEXT1 = "101" then -- CLR(B),...,TST(B)
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if OPEXT1 = "101" then -- CLR(B),...,TST(B)
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nstat.is_res := '0';
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nstat.is_res := '0';
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nstat.res_sel := c_dpath_res_dbox;
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nstat.res_sel := c_dpath_res_aunit;
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if OPBYTE = '1' then
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if OPBYTE = '1' then
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nstat.is_bytop := '1';
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nstat.is_bytop := '1';
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end if;
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end if;
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|
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nstat.dbox_cc1op := '1';
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nstat.aunit_cc1op := '1';
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|
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case OPEXT2 is
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case OPEXT2 is
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when "000" => -- CLR: 0 + 0 + 0 (0)
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when "000" => -- CLR: 0 + 0 + 0 (0)
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is_dstw := '1';
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is_dstw := '1';
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nstat.dbox_srcmod := c_dbox_mod_zero;
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nstat.aunit_srcmod := c_aunit_mod_zero;
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nstat.dbox_dstmod := c_dbox_mod_zero;
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nstat.aunit_dstmod := c_aunit_mod_zero;
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nstat.dbox_cimod := c_dbox_mod_zero;
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nstat.aunit_cimod := c_aunit_mod_zero;
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when "001" => -- COM: 0 + ~DST + 0 (~dst)
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when "001" => -- COM: 0 + ~DST + 0 (~dst)
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is_dstm := '1';
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is_dstm := '1';
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nstat.dbox_srcmod := c_dbox_mod_zero;
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nstat.aunit_srcmod := c_aunit_mod_zero;
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nstat.dbox_dstmod := c_dbox_mod_inv;
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nstat.aunit_dstmod := c_aunit_mod_inv;
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nstat.dbox_cimod := c_dbox_mod_zero;
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nstat.aunit_cimod := c_aunit_mod_zero;
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when "010" => -- INC: 0 + DST + 1 (dst+1)
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when "010" => -- INC: 0 + DST + 1 (dst+1)
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is_dstm := '1';
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is_dstm := '1';
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nstat.dbox_srcmod := c_dbox_mod_zero;
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nstat.aunit_srcmod := c_aunit_mod_zero;
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nstat.dbox_dstmod := c_dbox_mod_pass;
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nstat.aunit_dstmod := c_aunit_mod_pass;
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nstat.dbox_cimod := c_dbox_mod_one;
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nstat.aunit_cimod := c_aunit_mod_one;
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when "011" => -- DEC: ~0 + DST + 0 (dst-1)
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when "011" => -- DEC: ~0 + DST + 0 (dst-1)
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is_dstm := '1';
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is_dstm := '1';
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nstat.dbox_srcmod := c_dbox_mod_one;
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nstat.aunit_srcmod := c_aunit_mod_one;
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nstat.dbox_dstmod := c_dbox_mod_pass;
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nstat.aunit_dstmod := c_aunit_mod_pass;
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nstat.dbox_cimod := c_dbox_mod_zero;
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nstat.aunit_cimod := c_aunit_mod_zero;
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when "100" => -- NEG: 0 + ~DST + 1 (-dst)
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when "100" => -- NEG: 0 + ~DST + 1 (-dst)
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is_dstm := '1';
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is_dstm := '1';
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nstat.dbox_srcmod := c_dbox_mod_zero;
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nstat.aunit_srcmod := c_aunit_mod_zero;
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nstat.dbox_dstmod := c_dbox_mod_inv;
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nstat.aunit_dstmod := c_aunit_mod_inv;
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nstat.dbox_cimod := c_dbox_mod_one;
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nstat.aunit_cimod := c_aunit_mod_one;
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when "101" => -- ADC: 0 + DST + CI (dst+ci)
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when "101" => -- ADC: 0 + DST + CI (dst+ci)
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is_dstm := '1';
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is_dstm := '1';
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nstat.dbox_srcmod := c_dbox_mod_zero;
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nstat.aunit_srcmod := c_aunit_mod_zero;
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nstat.dbox_dstmod := c_dbox_mod_pass;
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nstat.aunit_dstmod := c_aunit_mod_pass;
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nstat.dbox_cimod := c_dbox_mod_pass;
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nstat.aunit_cimod := c_aunit_mod_pass;
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when "110" => -- SBC: ~0 + DST + ~CI (dst-ci)
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when "110" => -- SBC: ~0 + DST + ~CI (dst-ci)
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is_dstm := '1';
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is_dstm := '1';
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nstat.dbox_srcmod := c_dbox_mod_one;
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nstat.aunit_srcmod := c_aunit_mod_one;
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nstat.dbox_dstmod := c_dbox_mod_pass;
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nstat.aunit_dstmod := c_aunit_mod_pass;
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nstat.dbox_cimod := c_dbox_mod_inv;
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nstat.aunit_cimod := c_aunit_mod_inv;
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when "111" => -- TST: 0 + DST + 0 (dst)
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when "111" => -- TST: 0 + DST + 0 (dst)
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is_dstr := '1';
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is_dstr := '1';
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nstat.dbox_srcmod := c_dbox_mod_zero;
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nstat.aunit_srcmod := c_aunit_mod_zero;
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nstat.dbox_dstmod := c_dbox_mod_pass;
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nstat.aunit_dstmod := c_aunit_mod_pass;
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nstat.dbox_cimod := c_dbox_mod_zero;
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nstat.aunit_cimod := c_aunit_mod_zero;
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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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nstat.fork_opg := c_fork_opg_gen;
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nstat.fork_opg := c_fork_opg_gen;
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nstat.do_fork_opg := '1';
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nstat.do_fork_opg := '1';
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| Line 330... |
Line 331... |
nstat.do_fork_opg := '1';
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nstat.do_fork_opg := '1';
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nstat.do_pref_dec := is_dstmode0notpc;
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nstat.do_pref_dec := is_dstmode0notpc;
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if OPBYTE = '1' then
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if OPBYTE = '1' then
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nstat.is_bytop := '1';
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nstat.is_bytop := '1';
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end if;
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end if;
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nstat.res_sel := c_dpath_res_lbox;
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nstat.res_sel := c_dpath_res_lunit;
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case OPEXT2(1 downto 0) is
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case OPEXT2(1 downto 0) is
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when "00" => -- ROR
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when "00" => -- ROR
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nstat.lbox_func := c_lbox_func_ror;
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nstat.lunit_func := c_lunit_func_ror;
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when "01" => -- ROL
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when "01" => -- ROL
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nstat.lbox_func := c_lbox_func_rol;
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nstat.lunit_func := c_lunit_func_rol;
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when "10" => -- ASR
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when "10" => -- ASR
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nstat.lbox_func := c_lbox_func_asr;
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nstat.lunit_func := c_lunit_func_asr;
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when "11" => -- ASL
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when "11" => -- ASL
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nstat.lbox_func := c_lbox_func_asl;
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nstat.lunit_func := c_lunit_func_asl;
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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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end if;
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end if;
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if OPBYTE='0' and OPEXT2="100" then -- MARK
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if OPBYTE='0' and OPEXT2="100" then -- MARK
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| Line 356... |
Line 357... |
nstat.is_res := '0';
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nstat.is_res := '0';
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nstat.force_srcsp := '1';
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nstat.force_srcsp := '1';
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if DSTREG = c_gpr_sp then -- is dst reg == sp ?
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if DSTREG = c_gpr_sp then -- is dst reg == sp ?
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nstat.updt_dstadsrc := '1'; -- ensure DSRC update in dsta flow
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nstat.updt_dstadsrc := '1'; -- ensure DSRC update in dsta flow
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end if;
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end if;
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nstat.res_sel := c_dpath_res_abox;
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nstat.res_sel := c_dpath_res_ounit;
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if nstat.is_dstmode0 = '1' then
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if nstat.is_dstmode0 = '1' then
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nstat.fork_opa := c_fork_opa_mfp_reg;
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nstat.fork_opa := c_fork_opa_mfp_reg;
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else
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else
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nstat.fork_opa := c_fork_opa_mfp_mem;
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nstat.fork_opa := c_fork_opa_mfp_mem;
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end if;
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end if;
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| Line 368... |
Line 369... |
end if;
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end if;
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if OPEXT2 = "110" then -- MTP(I/D)
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if OPEXT2 = "110" then -- MTP(I/D)
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nstat.is_res := '0';
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nstat.is_res := '0';
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nstat.force_srcsp := '1';
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nstat.force_srcsp := '1';
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nstat.res_sel := c_dpath_res_abox;
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nstat.res_sel := c_dpath_res_ounit;
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nstat.fork_opa := c_fork_opa_mtp;
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nstat.fork_opa := c_fork_opa_mtp;
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nstat.fork_op := c_fork_op_mtp;
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nstat.fork_op := c_fork_op_mtp;
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nstat.do_fork_op := '1';
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nstat.do_fork_op := '1';
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end if;
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end if;
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| Line 380... |
Line 381... |
nstat.is_res := '0';
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nstat.is_res := '0';
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is_dstw := '1';
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is_dstw := '1';
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nstat.fork_opg := c_fork_opg_gen;
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nstat.fork_opg := c_fork_opg_gen;
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nstat.do_fork_opg := '1';
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nstat.do_fork_opg := '1';
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nstat.do_pref_dec := is_dstmode0notpc;
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nstat.do_pref_dec := is_dstmode0notpc;
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nstat.lbox_func := c_lbox_func_sxt;
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nstat.lunit_func := c_lunit_func_sxt;
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nstat.res_sel := c_dpath_res_lbox;
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nstat.res_sel := c_dpath_res_lunit;
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end if;
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end if;
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end if;
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end if;
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|
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end if; -- OPPRIM="000"
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end if; -- OPPRIM="000"
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| Line 394... |
Line 395... |
case OPPRIM is
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case OPPRIM is
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when "001" => -- MOV
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when "001" => -- MOV
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is_srcr := '1';
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is_srcr := '1';
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is_dstw := '1';
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is_dstw := '1';
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nstat.op_mov := '1';
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nstat.op_mov := '1';
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nstat.lbox_func := c_lbox_func_mov;
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nstat.lunit_func := c_lunit_func_mov;
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nstat.res_sel := c_dpath_res_lbox;
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nstat.res_sel := c_dpath_res_lunit;
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nstat.is_bytop := OPBYTE;
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nstat.is_bytop := OPBYTE;
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when "010" => -- CMP
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when "010" => -- CMP
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is_srcr := '1';
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is_srcr := '1';
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is_dstr := '1';
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is_dstr := '1';
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nstat.res_sel := c_dpath_res_dbox;
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nstat.res_sel := c_dpath_res_aunit;
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nstat.dbox_srcmod := c_dbox_mod_pass;
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nstat.aunit_srcmod := c_aunit_mod_pass;
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nstat.dbox_dstmod := c_dbox_mod_inv;
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nstat.aunit_dstmod := c_aunit_mod_inv;
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nstat.dbox_cimod := c_dbox_mod_one;
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nstat.aunit_cimod := c_aunit_mod_one;
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nstat.is_bytop := OPBYTE;
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nstat.is_bytop := OPBYTE;
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when "011" => -- BIT
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when "011" => -- BIT
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is_srcr := '1';
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is_srcr := '1';
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is_dstr := '1';
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is_dstr := '1';
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nstat.lbox_func := c_lbox_func_bit;
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nstat.lunit_func := c_lunit_func_bit;
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nstat.res_sel := c_dpath_res_lbox;
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nstat.res_sel := c_dpath_res_lunit;
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nstat.is_bytop := OPBYTE;
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nstat.is_bytop := OPBYTE;
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when "100" => -- BIC
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when "100" => -- BIC
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is_srcr := '1';
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is_srcr := '1';
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is_dstm := '1';
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is_dstm := '1';
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nstat.lbox_func := c_lbox_func_bic;
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nstat.lunit_func := c_lunit_func_bic;
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nstat.res_sel := c_dpath_res_lbox;
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nstat.res_sel := c_dpath_res_lunit;
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nstat.is_bytop := OPBYTE;
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nstat.is_bytop := OPBYTE;
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when "101" => -- BIS
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when "101" => -- BIS
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is_srcr := '1';
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is_srcr := '1';
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is_dstm := '1';
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is_dstm := '1';
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nstat.lbox_func := c_lbox_func_bis;
|
nstat.lunit_func := c_lunit_func_bis;
|
nstat.res_sel := c_dpath_res_lbox;
|
nstat.res_sel := c_dpath_res_lunit;
|
nstat.is_bytop := OPBYTE;
|
nstat.is_bytop := OPBYTE;
|
when "110" =>
|
when "110" =>
|
is_srcr := '1';
|
is_srcr := '1';
|
is_dstm := '1';
|
is_dstm := '1';
|
nstat.res_sel := c_dpath_res_dbox;
|
nstat.res_sel := c_dpath_res_aunit;
|
if OPBYTE = '0' then -- ADD
|
if OPBYTE = '0' then -- ADD
|
nstat.dbox_srcmod := c_dbox_mod_pass;
|
nstat.aunit_srcmod := c_aunit_mod_pass;
|
nstat.dbox_dstmod := c_dbox_mod_pass;
|
nstat.aunit_dstmod := c_aunit_mod_pass;
|
nstat.dbox_cimod := c_dbox_mod_zero;
|
nstat.aunit_cimod := c_aunit_mod_zero;
|
else -- SUB
|
else -- SUB
|
nstat.dbox_srcmod := c_dbox_mod_inv;
|
nstat.aunit_srcmod := c_aunit_mod_inv;
|
nstat.dbox_dstmod := c_dbox_mod_pass;
|
nstat.aunit_dstmod := c_aunit_mod_pass;
|
nstat.dbox_cimod := c_dbox_mod_one;
|
nstat.aunit_cimod := c_aunit_mod_one;
|
end if;
|
end if;
|
when others => null;
|
when others => null;
|
end case;
|
end case;
|
|
|
nstat.fork_opg := c_fork_opg_gen;
|
nstat.fork_opg := c_fork_opg_gen;
|
| Line 450... |
Line 451... |
if OPBYTE='0' and OPPRIM="111" then
|
if OPBYTE='0' and OPPRIM="111" then
|
case OPEXT1 is
|
case OPEXT1 is
|
when "000" => -- MUL
|
when "000" => -- MUL
|
nstat.is_res := '0';
|
nstat.is_res := '0';
|
is_dstr := '1';
|
is_dstr := '1';
|
nstat.mbox_func := c_mbox_func_mul;
|
nstat.munit_func := c_munit_func_mul;
|
nstat.res_sel := c_dpath_res_mbox;
|
nstat.res_sel := c_dpath_res_munit;
|
nstat.fork_opg := c_fork_opg_mul;
|
nstat.fork_opg := c_fork_opg_mul;
|
nstat.do_fork_opg := '1';
|
nstat.do_fork_opg := '1';
|
when "001" => -- DIV
|
when "001" => -- DIV
|
nstat.is_res := '0';
|
nstat.is_res := '0';
|
is_dstr := '1';
|
is_dstr := '1';
|
nstat.mbox_func := c_mbox_func_div;
|
nstat.munit_func := c_munit_func_div;
|
nstat.res_sel := c_dpath_res_mbox;
|
nstat.res_sel := c_dpath_res_munit;
|
nstat.fork_opg := c_fork_opg_div;
|
nstat.fork_opg := c_fork_opg_div;
|
nstat.do_fork_opg := '1';
|
nstat.do_fork_opg := '1';
|
when "010" => -- ASH
|
when "010" => -- ASH
|
nstat.is_res := '0';
|
nstat.is_res := '0';
|
is_dstr := '1';
|
is_dstr := '1';
|
nstat.mbox_func := c_mbox_func_ash;
|
nstat.munit_func := c_munit_func_ash;
|
nstat.res_sel := c_dpath_res_mbox;
|
nstat.res_sel := c_dpath_res_munit;
|
nstat.fork_opg := c_fork_opg_ash;
|
nstat.fork_opg := c_fork_opg_ash;
|
nstat.do_fork_opg := '1';
|
nstat.do_fork_opg := '1';
|
when "011" => -- ASHC
|
when "011" => -- ASHC
|
nstat.is_res := '0';
|
nstat.is_res := '0';
|
is_dstr := '1';
|
is_dstr := '1';
|
nstat.mbox_func := c_mbox_func_ashc;
|
nstat.munit_func := c_munit_func_ashc;
|
nstat.res_sel := c_dpath_res_mbox;
|
nstat.res_sel := c_dpath_res_munit;
|
nstat.fork_opg := c_fork_opg_ashc;
|
nstat.fork_opg := c_fork_opg_ashc;
|
nstat.do_fork_opg := '1';
|
nstat.do_fork_opg := '1';
|
when "100" => -- XOR
|
when "100" => -- XOR
|
nstat.is_res := '0';
|
nstat.is_res := '0';
|
is_dstm := '1';
|
is_dstm := '1';
|
nstat.lbox_func := c_lbox_func_xor;
|
nstat.lunit_func := c_lunit_func_xor;
|
nstat.res_sel := c_dpath_res_lbox;
|
nstat.res_sel := c_dpath_res_lunit;
|
nstat.fork_opg := c_fork_opg_gen;
|
nstat.fork_opg := c_fork_opg_gen;
|
nstat.do_fork_opg := '1';
|
nstat.do_fork_opg := '1';
|
nstat.do_pref_dec := is_dstmode0notpc;
|
nstat.do_pref_dec := is_dstmode0notpc;
|
when "111" => -- SOB: SRC + ~0 + 0 (src-1)
|
when "111" => -- SOB: SRC + ~0 + 0 (src-1)
|
nstat.is_res := '0';
|
nstat.is_res := '0';
|
nstat.dbox_srcmod := c_dbox_mod_pass;
|
nstat.aunit_srcmod := c_aunit_mod_pass;
|
nstat.dbox_dstmod := c_dbox_mod_one;
|
nstat.aunit_dstmod := c_aunit_mod_one;
|
nstat.dbox_cimod := c_dbox_mod_zero;
|
nstat.aunit_cimod := c_aunit_mod_zero;
|
nstat.res_sel := c_dpath_res_dbox;
|
nstat.res_sel := c_dpath_res_aunit;
|
nstat.fork_op := c_fork_op_sob;
|
nstat.fork_op := c_fork_op_sob;
|
nstat.do_fork_op := '1';
|
nstat.do_fork_op := '1';
|
when others => null;
|
when others => null;
|
end case;
|
end case;
|
|
|
