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-- $Id: ibd_kw11l.vhd 641 2015-02-01 22:12:15Z mueller $
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-- $Id: ibd_kw11l.vhd 676 2015-05-09 16:31:54Z mueller $
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--
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--
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-- Copyright 2008-2011 by Walter F.J. Mueller <W.F.J.Mueller@gsi.de>
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-- Copyright 2008-2015 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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-- 2010-10-17 333 12.1 M53d xc3s1000-4 9 23 0 14 s 5.3
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-- 2010-10-17 333 12.1 M53d xc3s1000-4 9 23 0 14 s 5.3
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-- 2009-07-11 232 10.1.03 K39 xc3s1000-4 8 25 0 15 s 5.3
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-- 2009-07-11 232 10.1.03 K39 xc3s1000-4 8 25 0 15 s 5.3
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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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-- 2015-05-09 676 1.2 add CPUSUSP, freeze timer when cpu suspended
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-- 2011-11-18 427 1.1.1 now numeric_std clean
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-- 2011-11-18 427 1.1.1 now numeric_std clean
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-- 2010-10-17 333 1.1 use ibus V2 interface
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-- 2010-10-17 333 1.1 use ibus V2 interface
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-- 2009-06-01 221 1.0.5 BUGFIX: add RESET; don't clear tcnt on ibus reset
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-- 2009-06-01 221 1.0.5 BUGFIX: add RESET; don't clear tcnt on ibus reset
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-- 2008-08-22 161 1.0.4 use iblib; add EI_ACK to proc_next sens. list
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-- 2008-08-22 161 1.0.4 use iblib; add EI_ACK to proc_next sens. list
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-- 2008-05-09 144 1.0.3 use intreq flop, use EI_ACK
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-- 2008-05-09 144 1.0.3 use intreq flop, use EI_ACK
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port (
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port (
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CLK : in slbit; -- clock
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CLK : in slbit; -- clock
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CE_MSEC : in slbit; -- msec pulse
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CE_MSEC : in slbit; -- msec pulse
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RESET : in slbit; -- system reset
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RESET : in slbit; -- system reset
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BRESET : in slbit; -- ibus reset
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BRESET : in slbit; -- ibus reset
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CPUSUSP : in slbit; -- cpu suspended
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IB_MREQ : in ib_mreq_type; -- ibus request
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IB_MREQ : in ib_mreq_type; -- ibus request
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IB_SRES : out ib_sres_type; -- ibus response
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IB_SRES : out ib_sres_type; -- ibus response
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EI_REQ : out slbit; -- interrupt request
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EI_REQ : out slbit; -- interrupt request
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EI_ACK : in slbit -- interrupt acknowledge
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EI_ACK : in slbit -- interrupt acknowledge
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);
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);
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R_REGS <= N_REGS;
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R_REGS <= N_REGS;
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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 process proc_regs;
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end process proc_regs;
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proc_next : process (R_REGS, IB_MREQ, CE_MSEC, EI_ACK)
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proc_next : process (R_REGS, IB_MREQ, CE_MSEC, CPUSUSP, EI_ACK)
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variable r : regs_type := regs_init;
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variable r : regs_type := regs_init;
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variable n : regs_type := regs_init;
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variable n : regs_type := regs_init;
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variable idout : slv16 := (others=>'0');
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variable idout : slv16 := (others=>'0');
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variable ibreq : slbit := '0';
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variable ibreq : slbit := '0';
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variable ibw0 : slbit := '0';
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variable ibw0 : slbit := '0';
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n.intreq := '0';
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n.intreq := '0';
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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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-- other state changes
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-- other state changes
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if CE_MSEC = '1' then
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if CE_MSEC='1' and CPUSUSP='0' then -- on msec and not suspended
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n.tcnt := slv(unsigned(r.tcnt) + 1);
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n.tcnt := slv(unsigned(r.tcnt) + 1);
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if unsigned(r.tcnt) = tdivide-1 then
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if unsigned(r.tcnt) = tdivide-1 then
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n.tcnt := (others=>'0');
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n.tcnt := (others=>'0');
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n.moni := '1';
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n.moni := '1';
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if r.ie = '1' then
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if r.ie = '1' then
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