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-- $Id: pdp11_irq.vhd 335 2010-10-24 22:24:23Z mueller $
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-- $Id: pdp11_irq.vhd 427 2011-11-19 21:04:11Z mueller $
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--
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--
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-- Copyright 2007-2010 by Walter F.J. Mueller <W.F.J.Mueller@gsi.de>
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-- Copyright 2007-2011 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: interrupt requester
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-- Description: pdp11: interrupt requester
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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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-- 2008-08-22 161 1.1.4 use iblib
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-- 2008-08-22 161 1.1.4 use iblib
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-- 2008-04-25 138 1.1.3 use BRESET to clear pirq
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-- 2008-04-25 138 1.1.3 use BRESET to clear pirq
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-- 2008-01-06 111 1.1.2 rename signal EI_ACK->EI_ACKM (master ack)
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-- 2008-01-06 111 1.1.2 rename signal EI_ACK->EI_ACKM (master ack)
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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_irq;
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end pdp11_irq;
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architecture syn of pdp11_irq is
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architecture syn of pdp11_irq is
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constant ibaddr_pirq : slv16 := conv_std_logic_vector(8#177772#,16);
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constant ibaddr_pirq : slv16 := slv(to_unsigned(8#177772#,16));
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subtype pirq_ubf_pir is integer range 15 downto 9;
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subtype pirq_ubf_pir is integer range 15 downto 9;
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subtype pirq_ubf_pia_h is integer range 7 downto 5;
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subtype pirq_ubf_pia_h is integer range 7 downto 5;
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subtype pirq_ubf_pia_l is integer range 3 downto 1;
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subtype pirq_ubf_pia_l is integer range 3 downto 1;
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IB_SRES.busy <= '0';
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IB_SRES.busy <= '0';
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end process proc_ibres;
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end process proc_ibres;
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proc_pirq : process (CLK)
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proc_pirq : 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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if BRESET = '1' then
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if BRESET = '1' then
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R_PIRQ <= (others => '0');
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R_PIRQ <= (others => '0');
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elsif IBSEL_PIRQ='1' and IB_MREQ.we='1'and IB_MREQ.be1='1' then
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elsif IBSEL_PIRQ='1' and IB_MREQ.we='1'and IB_MREQ.be1='1' then
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R_PIRQ <= IB_MREQ.din(pirq_ubf_pir);
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R_PIRQ <= IB_MREQ.din(pirq_ubf_pir);
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end if;
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end if;
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"010" when R_PIRQ(2)='1' else
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"010" when R_PIRQ(2)='1' else
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"001" when R_PIRQ(1)='1' else
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"001" when R_PIRQ(1)='1' else
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"000";
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"000";
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proc_irq : process (PI_PRI, EI_PRI, EI_VECT, INT_ACK)
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proc_irq : process (PI_PRI, EI_PRI, EI_VECT, INT_ACK)
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constant vect_default : slv9 := slv(to_unsigned(8#240#,9));
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begin
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begin
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EI_ACKM <= '0';
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EI_ACKM <= '0';
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if unsigned(EI_PRI) > unsigned(PI_PRI) then
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if unsigned(EI_PRI) > unsigned(PI_PRI) then
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PRI <= EI_PRI;
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PRI <= EI_PRI;
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VECT <= EI_VECT;
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VECT <= EI_VECT;
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EI_ACKM <= INT_ACK;
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EI_ACKM <= INT_ACK;
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else
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else
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PRI <= PI_PRI;
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PRI <= PI_PRI;
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VECT <= conv_std_logic_vector(8#240#,9)(8 downto 2);
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VECT <= vect_default(8 downto 2);
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end if;
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end if;
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end process proc_irq;
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end process proc_irq;
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end syn;
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end syn;
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