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-- $Id: pdp11_sequencer.vhd 569 2014-07-13 14:36:32Z mueller $
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-- $Id: pdp11_sequencer.vhd 643 2015-02-07 17:41:53Z mueller $
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--
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--
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-- Copyright 2006-2014 by Walter F.J. Mueller <W.F.J.Mueller@gsi.de>
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-- Copyright 2006-2015 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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-- Description: pdp11: CPU sequencer
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-- Description: pdp11: CPU sequencer
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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 8.2-14.7; viv 2014.1; ghdl 0.18-0.31
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-- Tool versions: ise 8.2-14.7; viv 2014.1; ghdl 0.18-0.31
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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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-- 2015-02-07 643 1.5.2 s_op_wait: load R0 in DSRC for DR emulation
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-- 2014-07-12 569 1.5.1 rename s_opg_div_zero -> s_opg_div_quit;
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-- 2014-07-12 569 1.5.1 rename s_opg_div_zero -> s_opg_div_quit;
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-- use DP_STAT.div_quit; set munit_s_div_sr;
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-- use DP_STAT.div_quit; set munit_s_div_sr;
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-- BUGFIX: s_opg_div_sr: check for late div_quit
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-- BUGFIX: s_opg_div_sr: check for late div_quit
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-- 2014-04-20 554 1.5 now vivado compatible (add dummy assigns in procs)
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-- 2014-04-20 554 1.5 now vivado compatible (add dummy assigns in procs)
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-- 2011-11-18 427 1.4.2 now numeric_std clean
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-- 2011-11-18 427 1.4.2 now numeric_std clean
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ncpuerr.illhlt := '1';
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ncpuerr.illhlt := '1';
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nstate := s_trap_4; -- trap 4 like 11/70
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nstate := s_trap_4; -- trap 4 like 11/70
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end if;
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end if;
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when s_op_wait => -- WAIT
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when s_op_wait => -- WAIT
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ndpcntl.gpr_asrc := "000"; -- load R0 in DSRC for DR emulation
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ndpcntl.dsrc_sel := c_dpath_dsrc_src;
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ndpcntl.dsrc_we := '1';
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nstate := s_op_wait; -- spin here
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nstate := s_op_wait; -- spin here
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if is_kmode = '0' then -- but act as nop if not in kernel
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if is_kmode = '0' then -- but act as nop if not in kernel
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nstate := s_idle;
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nstate := s_idle;
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elsif int_pending = '1' or -- bail out if pending interrupt
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elsif int_pending = '1' or -- bail out if pending interrupt
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R_STATUS.cpustep='1' then -- or the instruction is only stepped
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R_STATUS.cpustep='1' then -- or the instruction is only stepped
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