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-- $Id: pdp11_mmu_ssr12.vhd 335 2010-10-24 22:24:23Z mueller $
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-- $Id: pdp11_mmu_ssr12.vhd 427 2011-11-19 21:04:11Z mueller $
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--
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--
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-- Copyright 2006-2010 by Walter F.J. Mueller <W.F.J.Mueller@gsi.de>
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-- Copyright 2006-2011 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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-- Software Foundation, either version 2, or at your option any later version.
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-- Software Foundation, either version 2, or at your option any later version.
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--
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--
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-- Description: pdp11: mmu register ssr1 and ssr2
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-- Description: pdp11: mmu register ssr1 and ssr2
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--
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--
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-- Dependencies: ib_sel
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-- Dependencies: ib_sel
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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, 12.1; ghdl 0.18-0.29
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-- Tool versions: xst 8.2, 9.1, 9.2, 12.1, 13.1; ghdl 0.18-0.29
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--
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--
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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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-- 2011-11-18 427 1.2.2 now numeric_std clean
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-- 2010-10-23 335 1.2.1 use ib_sel
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-- 2010-10-23 335 1.2.1 use ib_sel
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-- 2010-10-17 333 1.2 use ibus V2 interface
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-- 2010-10-17 333 1.2 use ibus V2 interface
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-- 2009-05-30 220 1.1.4 final removal of snoopers (were already commented)
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-- 2009-05-30 220 1.1.4 final removal of snoopers (were already commented)
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-- 2008-08-22 161 1.1.3 rename ubf_ -> ibf_; use iblib
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-- 2008-08-22 161 1.1.3 rename ubf_ -> ibf_; use iblib
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-- 2008-03-02 121 1.1.2 remove snoopers
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-- 2008-03-02 121 1.1.2 remove snoopers
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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 ieee.std_logic_1164.all;
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use ieee.std_logic_1164.all;
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use ieee.std_logic_arith.all;
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use ieee.numeric_std.all;
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use work.slvtypes.all;
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use work.slvtypes.all;
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use work.iblib.all;
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use work.iblib.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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end pdp11_mmu_ssr12;
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end pdp11_mmu_ssr12;
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architecture syn of pdp11_mmu_ssr12 is
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architecture syn of pdp11_mmu_ssr12 is
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constant ibaddr_ssr1 : slv16 := conv_std_logic_vector(8#177574#,16);
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constant ibaddr_ssr1 : slv16 := slv(to_unsigned(8#177574#,16));
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constant ibaddr_ssr2 : slv16 := conv_std_logic_vector(8#177576#,16);
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constant ibaddr_ssr2 : slv16 := slv(to_unsigned(8#177576#,16));
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subtype ssr1_ibf_rb_delta is integer range 15 downto 11;
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subtype ssr1_ibf_rb_delta is integer range 15 downto 11;
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subtype ssr1_ibf_rb_num is integer range 10 downto 8;
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subtype ssr1_ibf_rb_num is integer range 10 downto 8;
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subtype ssr1_ibf_ra_delta is integer range 7 downto 3;
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subtype ssr1_ibf_ra_delta is integer range 7 downto 3;
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subtype ssr1_ibf_ra_num is integer range 2 downto 0;
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subtype ssr1_ibf_ra_num is integer range 2 downto 0;
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end process proc_ibres;
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end process proc_ibres;
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proc_regs : process (CLK)
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proc_regs : process (CLK)
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begin
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begin
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if CLK'event and CLK='1' then
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if rising_edge(CLK) then
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R_SSR1 <= N_SSR1;
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R_SSR1 <= N_SSR1;
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R_SSR2 <= N_SSR2;
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R_SSR2 <= N_SSR2;
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end if;
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end if;
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end process proc_regs;
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end process proc_regs;
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elsif MONI.regmod = '1' then
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elsif MONI.regmod = '1' then
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if use_rb = '0' then
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if use_rb = '0' then
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nssr1.ra_num := MONI.regnum;
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nssr1.ra_num := MONI.regnum;
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if MONI.isdec = '0' then
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if MONI.isdec = '0' then
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nssr1.ra_delta := signed(nssr1.ra_delta) + signed(delta);
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nssr1.ra_delta := slv(signed(nssr1.ra_delta) + signed(delta));
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else
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else
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nssr1.ra_delta := signed(nssr1.ra_delta) - signed(delta);
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nssr1.ra_delta := slv(signed(nssr1.ra_delta) - signed(delta));
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end if;
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end if;
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else
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else
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nssr1.rb_num := MONI.regnum;
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nssr1.rb_num := MONI.regnum;
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if MONI.isdec = '0' then
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if MONI.isdec = '0' then
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nssr1.rb_delta := signed(nssr1.rb_delta) + signed(delta);
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nssr1.rb_delta := slv(signed(nssr1.rb_delta) + signed(delta));
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else
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else
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nssr1.rb_delta := signed(nssr1.rb_delta) - signed(delta);
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nssr1.rb_delta := slv(signed(nssr1.rb_delta) - signed(delta));
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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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end if;
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end if;
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end if;
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end if;
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