-- $Id: ibd_iist.vhd 335 2010-10-24 22:24:23Z mueller $
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-- $Id: ibd_iist.vhd 350 2010-12-28 16:40:11Z mueller $
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--
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--
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-- Copyright 2009-2010 by Walter F.J. Mueller <W.F.J.Mueller@gsi.de>
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-- Copyright 2009-2010 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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-- This program is distributed in the hope that it will be useful, but
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-- This program is distributed in the hope that it will be useful, but
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-- WITHOUT ANY WARRANTY, without even the implied warranty of MERCHANTABILITY
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-- WITHOUT ANY WARRANTY, without even the implied warranty of MERCHANTABILITY
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-- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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-- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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-- for complete details.
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-- for complete details.
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--
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--
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------------------------------------------------------------------------------
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------------------------------------------------------------------------------
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-- Module Name: ibd_iist - syn
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-- Module Name: ibd_iist - syn
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-- Description: ibus dev(loc): IIST
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-- Description: ibus dev(loc): IIST
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--
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--
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-- Dependencies: -
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-- Dependencies: -
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-- Test bench: -
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-- Test bench: -
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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 8.1, 8.2, 9.1, 9.2, 12.1; ghdl 0.18-0.29
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--
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--
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-- Synthesized (xst):
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-- Synthesized (xst):
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-- Date Rev ise Target flop lutl lutm slic t peri
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-- Date Rev ise Target flop lutl lutm slic t peri
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-- 2010-10-17 333 12.1 M53 xc3s1000-4 112 510 0 291 s 15.8
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-- 2010-10-17 333 12.1 M53d xc3s1000-4 112 510 0 291 s 15.8
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-- 2010-10-17 314 12.1 M53 xc3s1000-4 111 504 0 290 s 15.6
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-- 2010-10-17 314 12.1 M53d xc3s1000-4 111 504 0 290 s 15.6
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-- 2009-06-01 223 10.1.03 K39 xc3s1000-4 111 439 0 256 s 9.8
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-- 2009-06-01 223 10.1.03 K39 xc3s1000-4 111 439 0 256 s 9.8
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-- 2009-06-01 221 10.1.03 K39 xc3s1000-4 111 449 0 258 s 13.3
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-- 2009-06-01 221 10.1.03 K39 xc3s1000-4 111 449 0 258 s 13.3
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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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-- 2010-10-17 333 0.8 use ibus V2 interface
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-- 2010-10-17 333 0.8 use ibus V2 interface
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-- 2009-06-07 224 0.7 send inverted stc_stp; remove pgc_err; honor msk_im
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-- 2009-06-07 224 0.7 send inverted stc_stp; remove pgc_err; honor msk_im
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-- also for dcf_dcf and exc_rte; add iist_mreq and
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-- also for dcf_dcf and exc_rte; add iist_mreq and
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-- iist_sreq, boot and lock interfaces
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-- iist_sreq, boot and lock interfaces
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-- 2009-06-05 223 0.6 level interrupt, parity logic, exc.ui logic
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-- 2009-06-05 223 0.6 level interrupt, parity logic, exc.ui logic
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-- st logic modified (partially tested)
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-- st logic modified (partially tested)
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-- 2009-06-01 221 0.5 Initial version (untested, lock&boot missing)
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-- 2009-06-01 221 0.5 Initial version (untested, lock&boot missing)
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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.std_logic_arith.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.ibdlib.all;
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use work.ibdlib.all;
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-- ----------------------------------------------------------------------------
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-- ----------------------------------------------------------------------------
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entity ibd_iist is -- ibus dev(loc): IIST
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entity ibd_iist is -- ibus dev(loc): IIST
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-- fixed address: 177500
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-- fixed address: 177500
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generic (
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generic (
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SID : slv2 := "00"); -- self id
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SID : slv2 := "00"); -- self id
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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_USEC : in slbit; -- usec pulse
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CE_USEC : in slbit; -- usec 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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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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IIST_BUS : in iist_bus_type; -- iist bus (input from all iist's)
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IIST_BUS : in iist_bus_type; -- iist bus (input from all iist's)
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IIST_OUT : out iist_line_type; -- iist output
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IIST_OUT : out iist_line_type; -- iist output
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IIST_MREQ : out iist_mreq_type; -- iist->cpu requests
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IIST_MREQ : out iist_mreq_type; -- iist->cpu requests
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IIST_SRES : in iist_sres_type -- cpu->iist responses
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IIST_SRES : in iist_sres_type -- cpu->iist responses
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);
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);
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end ibd_iist;
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end ibd_iist;
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architecture syn of ibd_iist is
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architecture syn of ibd_iist is
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constant ibaddr_iist : slv16 := conv_std_logic_vector(8#177500#,16);
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constant ibaddr_iist : slv16 := conv_std_logic_vector(8#177500#,16);
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constant tdlysnd : natural := 150; -- send delay timer
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constant tdlysnd : natural := 150; -- send delay timer
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constant ibaddr_acr : slv1 := "0"; -- acr address offset
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constant ibaddr_acr : slv1 := "0"; -- acr address offset
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constant ibaddr_adr : slv1 := "1"; -- adr address offset
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constant ibaddr_adr : slv1 := "1"; -- adr address offset
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constant acr_ibf_clr : integer := 15; -- clear flag
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constant acr_ibf_clr : integer := 15; -- clear flag
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subtype acr_ibf_sid is integer range 9 downto 8; -- self id
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subtype acr_ibf_sid is integer range 9 downto 8; -- self id
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subtype acr_ibf_ac is integer range 3 downto 0; -- ac code
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subtype acr_ibf_ac is integer range 3 downto 0; -- ac code
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constant ac_pge : slv4 := "0000"; -- 0 program generated enables
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constant ac_pge : slv4 := "0000"; -- 0 program generated enables
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constant ac_pgc : slv4 := "0001"; -- 1 program generated control/status
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constant ac_pgc : slv4 := "0001"; -- 1 program generated control/status
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constant ac_ste : slv4 := "0010"; -- 2 sanity timer enables
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constant ac_ste : slv4 := "0010"; -- 2 sanity timer enables
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constant ac_stc : slv4 := "0011"; -- 3 sanity timer control/status
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constant ac_stc : slv4 := "0011"; -- 3 sanity timer control/status
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constant ac_msk : slv4 := "0100"; -- 4 input masks
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constant ac_msk : slv4 := "0100"; -- 4 input masks
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constant ac_pgf : slv4 := "0101"; -- 5 program generated flags
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constant ac_pgf : slv4 := "0101"; -- 5 program generated flags
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constant ac_stf : slv4 := "0110"; -- 6 sanity timer flags
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constant ac_stf : slv4 := "0110"; -- 6 sanity timer flags
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constant ac_dcf : slv4 := "0111"; -- 7 disconnect flags
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constant ac_dcf : slv4 := "0111"; -- 7 disconnect flags
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constant ac_exc : slv4 := "1000"; -- 10 exceptions
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constant ac_exc : slv4 := "1000"; -- 10 exceptions
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constant ac_mtc : slv4 := "1101"; -- 15 maintenance control
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constant ac_mtc : slv4 := "1101"; -- 15 maintenance control
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subtype pge_ibf_pbe is integer range 11 downto 8; -- pg boot ena
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subtype pge_ibf_pbe is integer range 11 downto 8; -- pg boot ena
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subtype pge_ibf_pie is integer range 3 downto 0; -- pg int ena
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subtype pge_ibf_pie is integer range 3 downto 0; -- pg int ena
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constant pgc_ibf_err : integer := 15; -- error
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constant pgc_ibf_err : integer := 15; -- error
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constant pgc_ibf_grj : integer := 14; -- go reject
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constant pgc_ibf_grj : integer := 14; -- go reject
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constant pgc_ibf_pgrmr : integer := 13; -- pg req refused
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constant pgc_ibf_pgrmr : integer := 13; -- pg req refused
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constant pgc_ibf_strmr : integer := 12; -- st req refused
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constant pgc_ibf_strmr : integer := 12; -- st req refused
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constant pgc_ibf_rdy : integer := 11; -- ready flag
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constant pgc_ibf_rdy : integer := 11; -- ready flag
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subtype pgc_ibf_sid is integer range 9 downto 8; -- self id
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subtype pgc_ibf_sid is integer range 9 downto 8; -- self id
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constant pgc_ibf_ip : integer := 3; -- int pending
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constant pgc_ibf_ip : integer := 3; -- int pending
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constant pgc_ibf_ie : integer := 2; -- int enable
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constant pgc_ibf_ie : integer := 2; -- int enable
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constant pgc_ibf_ptp : integer := 1; -- pg parity
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constant pgc_ibf_ptp : integer := 1; -- pg parity
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constant pgc_ibf_go : integer := 0; -- go flag
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constant pgc_ibf_go : integer := 0; -- go flag
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subtype ste_ibf_sbe is integer range 11 downto 8; -- st boot enable
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subtype ste_ibf_sbe is integer range 11 downto 8; -- st boot enable
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subtype ste_ibf_sie is integer range 3 downto 0; -- st int enable
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subtype ste_ibf_sie is integer range 3 downto 0; -- st int enable
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subtype stc_ibf_count is integer range 15 downto 8; -- count
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subtype stc_ibf_count is integer range 15 downto 8; -- count
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constant stc_ibf_tmo : integer := 3; -- timeout
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constant stc_ibf_tmo : integer := 3; -- timeout
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constant stc_ibf_lke : integer := 2; -- lockup enable
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constant stc_ibf_lke : integer := 2; -- lockup enable
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constant stc_ibf_stp : integer := 1; -- st parity
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constant stc_ibf_stp : integer := 1; -- st parity
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constant stc_ibf_enb : integer := 0; -- enable
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constant stc_ibf_enb : integer := 0; -- enable
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subtype msk_ibf_bm is integer range 11 downto 8; -- boot mask
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subtype msk_ibf_bm is integer range 11 downto 8; -- boot mask
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subtype msk_ibf_im is integer range 3 downto 0; -- int mask
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subtype msk_ibf_im is integer range 3 downto 0; -- int mask
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subtype pgf_ibf_pbf is integer range 11 downto 8; -- boot flags
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subtype pgf_ibf_pbf is integer range 11 downto 8; -- boot flags
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subtype pgf_ibf_pif is integer range 3 downto 0; -- int flags
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subtype pgf_ibf_pif is integer range 3 downto 0; -- int flags
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subtype stf_ibf_sbf is integer range 11 downto 8; -- boot flags
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subtype stf_ibf_sbf is integer range 11 downto 8; -- boot flags
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subtype stf_ibf_sif is integer range 3 downto 0; -- int flags
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subtype stf_ibf_sif is integer range 3 downto 0; -- int flags
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subtype dcf_ibf_brk is integer range 11 downto 8; -- break flags
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subtype dcf_ibf_brk is integer range 11 downto 8; -- break flags
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subtype dcf_ibf_dcf is integer range 3 downto 0; -- disconnect flags
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subtype dcf_ibf_dcf is integer range 3 downto 0; -- disconnect flags
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subtype exc_ibf_ui is integer range 11 downto 8; -- unexpected int
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subtype exc_ibf_ui is integer range 11 downto 8; -- unexpected int
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subtype exc_ibf_rte is integer range 3 downto 0; -- transm. error
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subtype exc_ibf_rte is integer range 3 downto 0; -- transm. error
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constant mtc_ibf_mttp : integer := 11; -- maint. type
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constant mtc_ibf_mttp : integer := 11; -- maint. type
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constant mtc_ibf_mfrm : integer := 10; -- maint. frame err
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constant mtc_ibf_mfrm : integer := 10; -- maint. frame err
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subtype mtc_ibf_mid is integer range 9 downto 8; -- maint. id
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subtype mtc_ibf_mid is integer range 9 downto 8; -- maint. id
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constant mtc_ibf_dsbt : integer := 3; -- disable boot
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constant mtc_ibf_dsbt : integer := 3; -- disable boot
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constant mtc_ibf_enmxd : integer := 2; -- enable maint mux
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constant mtc_ibf_enmxd : integer := 2; -- enable maint mux
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constant mtc_ibf_enmlp : integer := 1; -- enable maint loop
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constant mtc_ibf_enmlp : integer := 1; -- enable maint loop
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constant mtc_ibf_dsdrv : integer := 0; -- disable driver
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constant mtc_ibf_dsdrv : integer := 0; -- disable driver
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type state_type is (
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type state_type is (
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s_idle, -- idle state
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s_idle, -- idle state
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s_clear, -- handle acr clr
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s_clear, -- handle acr clr
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s_stsnd, -- handle st transmit
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s_stsnd, -- handle st transmit
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s_pgsnd -- handle pg transmit
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s_pgsnd -- handle pg transmit
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);
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);
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type regs_type is record -- state registers
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type regs_type is record -- state registers
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ibsel : slbit; -- ibus select
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ibsel : slbit; -- ibus select
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acr_ac : slv4; -- acr: ac
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acr_ac : slv4; -- acr: ac
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pge_pbe : slv4; -- pge: pg boot ena
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pge_pbe : slv4; -- pge: pg boot ena
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pge_pie : slv4; -- pge: pg int ena
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pge_pie : slv4; -- pge: pg int ena
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pgc_grj : slbit; -- pgc: go reject
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pgc_grj : slbit; -- pgc: go reject
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pgc_pgrmr : slbit; -- pgc: pg req refused
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pgc_pgrmr : slbit; -- pgc: pg req refused
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pgc_strmr : slbit; -- pgc: st req refused
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pgc_strmr : slbit; -- pgc: st req refused
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pgc_ie : slbit; -- pgc: int enable
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pgc_ie : slbit; -- pgc: int enable
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pgc_ptp : slbit; -- pgc: pg parity
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pgc_ptp : slbit; -- pgc: pg parity
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ste_sbe : slv4; -- ste: st boot enable
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ste_sbe : slv4; -- ste: st boot enable
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ste_sie : slv4; -- ste: st int enable
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ste_sie : slv4; -- ste: st int enable
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stc_count : slv8; -- stc: count
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stc_count : slv8; -- stc: count
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stc_tmo : slbit; -- stc: timeout
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stc_tmo : slbit; -- stc: timeout
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stc_lke : slbit; -- stc: lockup enable
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stc_lke : slbit; -- stc: lockup enable
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stc_stp : slbit; -- stc: st parity
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stc_stp : slbit; -- stc: st parity
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stc_enb : slbit; -- stc: enable
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stc_enb : slbit; -- stc: enable
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msk_bm : slv4; -- msk: boot mask
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msk_bm : slv4; -- msk: boot mask
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msk_im : slv4; -- msk: int mask
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msk_im : slv4; -- msk: int mask
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pgf_pbf : slv4; -- pgf: boot flags
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pgf_pbf : slv4; -- pgf: boot flags
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pgf_pif : slv4; -- pgf: int flags
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pgf_pif : slv4; -- pgf: int flags
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stf_sbf : slv4; -- stf: boot flags
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stf_sbf : slv4; -- stf: boot flags
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stf_sif : slv4; -- stf: int flags
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stf_sif : slv4; -- stf: int flags
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dcf_brk : slv4; -- dcf: break flags
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dcf_brk : slv4; -- dcf: break flags
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dcf_dcf : slv4; -- dcf: disconnect flags
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dcf_dcf : slv4; -- dcf: disconnect flags
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exc_ui : slv4; -- exc: unexpected int
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exc_ui : slv4; -- exc: unexpected int
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exc_rte : slv4; -- exc: transm. error
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exc_rte : slv4; -- exc: transm. error
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mtc_mttp : slbit; -- mtc: maint. type
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mtc_mttp : slbit; -- mtc: maint. type
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mtc_mfrm : slbit; -- mtc: maint. frame err
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mtc_mfrm : slbit; -- mtc: maint. frame err
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mtc_mid : slv2; -- mtc: maint. id
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mtc_mid : slv2; -- mtc: maint. id
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mtc_dsbt : slbit; -- mtc: disable boot
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mtc_dsbt : slbit; -- mtc: disable boot
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mtc_enmxd : slbit; -- mtc: enable maint mux
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mtc_enmxd : slbit; -- mtc: enable maint mux
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mtc_enmlp : slbit; -- mtc: enable maint loop
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mtc_enmlp : slbit; -- mtc: enable maint loop
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mtc_dsdrv : slbit; -- mtc: disable driver
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mtc_dsdrv : slbit; -- mtc: disable driver
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state : state_type; -- state
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state : state_type; -- state
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req_clear : slbit; -- request clear
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req_clear : slbit; -- request clear
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req_stsnd : slbit; -- request sanity timer transmit
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req_stsnd : slbit; -- request sanity timer transmit
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req_pgsnd : slbit; -- request prog. gen. transmit
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req_pgsnd : slbit; -- request prog. gen. transmit
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tcnt256 : slv8; -- usec clock divider for st clock
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tcnt256 : slv8; -- usec clock divider for st clock
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tcntsnd : slv8; -- timer for transmit delay
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tcntsnd : slv8; -- timer for transmit delay
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req_lock : slbit; -- cpu lock request
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req_lock : slbit; -- cpu lock request
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req_boot : slbit; -- cpu boot request
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req_boot : slbit; -- cpu boot request
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end record regs_type;
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end record regs_type;
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constant regs_init : regs_type := (
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constant regs_init : regs_type := (
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'0', -- ibsel
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'0', -- ibsel
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"0000", -- acr_ac
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"0000", -- acr_ac
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"0000","0000", -- pge_pbe, pge_pie
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"0000","0000", -- pge_pbe, pge_pie
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'0', -- pgc_grj
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'0', -- pgc_grj
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'0','0', -- pgc_pgrmr, pgc_strmr
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'0','0', -- pgc_pgrmr, pgc_strmr
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'0','0', -- pgc_ie, pgc_ptp
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'0','0', -- pgc_ie, pgc_ptp
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"0000","0000", -- ste_sbe, ste_sie
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"0000","0000", -- ste_sbe, ste_sie
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(others=>'0'), -- stc_count
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(others=>'0'), -- stc_count
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'0','0', -- stc_tmo, stc_lke
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'0','0', -- stc_tmo, stc_lke
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'0','0', -- stc_stp, stc_enb
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'0','0', -- stc_stp, stc_enb
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"0000","0000", -- msk_bm, msk_im
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"0000","0000", -- msk_bm, msk_im
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"0000","0000", -- pgf_pbf, pgf_pif
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"0000","0000", -- pgf_pbf, pgf_pif
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"0000","0000", -- stf_sbf, stf_sif
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"0000","0000", -- stf_sbf, stf_sif
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"0000","0000", -- dcf_brk, dcf_dcf
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"0000","0000", -- dcf_brk, dcf_dcf
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"0000","0000", -- exc_ui, exc_rte
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"0000","0000", -- exc_ui, exc_rte
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'0','0', -- mtc_mttp, mtc_mfrm
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'0','0', -- mtc_mttp, mtc_mfrm
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"00", -- mtc_mid
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"00", -- mtc_mid
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'0','0', -- mtc_dsbt, mtc_enmxd
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'0','0', -- mtc_dsbt, mtc_enmxd
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'0','0', -- mtc_enmlp, mtc_dsdrv
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'0','0', -- mtc_enmlp, mtc_dsdrv
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s_idle, -- state
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s_idle, -- state
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'0', -- req_clear
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'0', -- req_clear
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'0','0', -- req_stsnd, req_pgsnd
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'0','0', -- req_stsnd, req_pgsnd
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(others=>'0'), -- tcnt256
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(others=>'0'), -- tcnt256
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(others=>'0'), -- tcntsnd
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(others=>'0'), -- tcntsnd
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'0','0' -- req_lock, req_boot
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'0','0' -- req_lock, req_boot
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);
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);
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signal R_REGS : regs_type := regs_init;
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signal R_REGS : regs_type := regs_init;
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signal N_REGS : regs_type := regs_init;
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signal N_REGS : regs_type := regs_init;
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begin
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begin
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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 CLK'event and CLK='1' then
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if BRESET = '1' or -- BRESET is 1 for system and ibus reset
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if BRESET = '1' or -- BRESET is 1 for system and ibus reset
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R_REGS.req_clear='1' then
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R_REGS.req_clear='1' then
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R_REGS <= regs_init; --
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R_REGS <= regs_init; --
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if RESET = '0' then -- if RESET=0 we do just an ibus reset
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if RESET = '0' then -- if RESET=0 we do just an ibus reset
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R_REGS.pgf_pbf <= N_REGS.pgf_pbf; -- don't reset pg boot flags
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R_REGS.pgf_pbf <= N_REGS.pgf_pbf; -- don't reset pg boot flags
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R_REGS.stf_sbf <= N_REGS.stf_sbf; -- don't reset st boot flags
|
R_REGS.stf_sbf <= N_REGS.stf_sbf; -- don't reset st boot flags
|
R_REGS.tcnt256 <= N_REGS.tcnt256; -- don't reset st clock divider
|
R_REGS.tcnt256 <= N_REGS.tcnt256; -- don't reset st clock divider
|
end if;
|
end if;
|
else
|
else
|
R_REGS <= N_REGS;
|
R_REGS <= N_REGS;
|
end if;
|
end if;
|
end if;
|
end if;
|
end process proc_regs;
|
end process proc_regs;
|
|
|
proc_next : process (R_REGS, CE_USEC, IB_MREQ, EI_ACK, EI_ACK,
|
proc_next : process (R_REGS, CE_USEC, IB_MREQ, EI_ACK, EI_ACK,
|
IIST_BUS(0), IIST_BUS(1), IIST_BUS(2), IIST_BUS(3),
|
IIST_BUS(0), IIST_BUS(1), IIST_BUS(2), IIST_BUS(3),
|
IIST_SRES)
|
IIST_SRES)
|
variable r : regs_type := regs_init;
|
variable r : regs_type := regs_init;
|
variable n : regs_type := regs_init;
|
variable n : regs_type := regs_init;
|
variable ibhold : slbit := '0';
|
variable ibhold : slbit := '0';
|
variable idout : slv16 := (others=>'0');
|
variable idout : slv16 := (others=>'0');
|
variable ibreq : slbit := '0';
|
variable ibreq : slbit := '0';
|
variable ibrd : slbit := '0';
|
variable ibrd : slbit := '0';
|
variable ibw0 : slbit := '0';
|
variable ibw0 : slbit := '0';
|
variable ibw1 : slbit := '0';
|
variable ibw1 : slbit := '0';
|
variable int_or : slbit := '0';
|
variable int_or : slbit := '0';
|
variable tcnt256_end : slbit := '0';
|
variable tcnt256_end : slbit := '0';
|
variable tcntsnd_end : slbit := '0';
|
variable tcntsnd_end : slbit := '0';
|
variable eff_id : slv2 := "00";
|
variable eff_id : slv2 := "00";
|
variable eff_bus : iist_bus_type := iist_bus_init;
|
variable eff_bus : iist_bus_type := iist_bus_init;
|
variable par_err : slbit := '0';
|
variable par_err : slbit := '0';
|
variable act_ibit : slbit := '0';
|
variable act_ibit : slbit := '0';
|
variable act_bbit : slbit := '0';
|
variable act_bbit : slbit := '0';
|
variable iout : iist_line_type := iist_line_init;
|
variable iout : iist_line_type := iist_line_init;
|
begin
|
begin
|
|
|
r := R_REGS;
|
r := R_REGS;
|
n := R_REGS;
|
n := R_REGS;
|
|
|
ibhold := '0';
|
ibhold := '0';
|
idout := (others=>'0');
|
idout := (others=>'0');
|
ibreq := IB_MREQ.re or IB_MREQ.we;
|
ibreq := IB_MREQ.re or IB_MREQ.we;
|
ibrd := IB_MREQ.re;
|
ibrd := IB_MREQ.re;
|
ibw0 := IB_MREQ.we and IB_MREQ.be0;
|
ibw0 := IB_MREQ.we and IB_MREQ.be0;
|
ibw1 := IB_MREQ.we and IB_MREQ.be1;
|
ibw1 := IB_MREQ.we and IB_MREQ.be1;
|
|
|
int_or := r.pgc_grj or r.pgc_pgrmr or r.pgc_strmr;
|
int_or := r.pgc_grj or r.pgc_pgrmr or r.pgc_strmr;
|
for i in r.dcf_dcf'range loop
|
for i in r.dcf_dcf'range loop
|
int_or := int_or or r.dcf_dcf(i) or
|
int_or := int_or or r.dcf_dcf(i) or
|
r.exc_rte(i) or
|
r.exc_rte(i) or
|
r.pgf_pif(i) or
|
r.pgf_pif(i) or
|
r.stf_sif(i);
|
r.stf_sif(i);
|
end loop; -- i
|
end loop; -- i
|
|
|
tcnt256_end := '0';
|
tcnt256_end := '0';
|
if CE_USEC='1' and r.stc_enb='1'then -- if st enabled on every usec
|
if CE_USEC='1' and r.stc_enb='1'then -- if st enabled on every usec
|
n.tcnt256 := unsigned(r.tcnt256) + 1; -- advance 8 bit counter
|
n.tcnt256 := unsigned(r.tcnt256) + 1; -- advance 8 bit counter
|
if unsigned(r.tcnt256) = 255 then -- if wrap
|
if unsigned(r.tcnt256) = 255 then -- if wrap
|
tcnt256_end := '1'; -- signal 256 usec passed
|
tcnt256_end := '1'; -- signal 256 usec passed
|
end if;
|
end if;
|
end if;
|
end if;
|
|
|
tcntsnd_end := '0';
|
tcntsnd_end := '0';
|
n.tcntsnd := unsigned(r.tcntsnd) + 1; -- advance send timer counter
|
n.tcntsnd := unsigned(r.tcntsnd) + 1; -- advance send timer counter
|
if unsigned(r.tcntsnd) = tdlysnd-1 then -- if delay time reached
|
if unsigned(r.tcntsnd) = tdlysnd-1 then -- if delay time reached
|
tcntsnd_end := '1'; -- signal end
|
tcntsnd_end := '1'; -- signal end
|
end if;
|
end if;
|
|
|
eff_id := SID; -- effective self-id, normally SID
|
eff_id := SID; -- effective self-id, normally SID
|
if r.mtc_enmxd = '1' then -- if maint. mux enabled
|
if r.mtc_enmxd = '1' then -- if maint. mux enabled
|
eff_id := r.mtc_mid; -- use maint. id
|
eff_id := r.mtc_mid; -- use maint. id
|
end if;
|
end if;
|
|
|
eff_bus := IIST_BUS;
|
eff_bus := IIST_BUS;
|
|
|
par_err := '0';
|
par_err := '0';
|
act_ibit := '0';
|
act_ibit := '0';
|
act_bbit := '0';
|
act_bbit := '0';
|
iout := iist_line_init; -- default state of out line
|
iout := iist_line_init; -- default state of out line
|
|
|
-- ibus address decoder
|
-- ibus address decoder
|
n.ibsel := '0';
|
n.ibsel := '0';
|
if IB_MREQ.aval='1' and
|
if IB_MREQ.aval='1' and
|
IB_MREQ.addr(12 downto 2)=ibaddr_iist(12 downto 2) then
|
IB_MREQ.addr(12 downto 2)=ibaddr_iist(12 downto 2) then
|
n.ibsel := '1';
|
n.ibsel := '1';
|
end if;
|
end if;
|
|
|
-- internal state machine
|
-- internal state machine
|
case r.state is
|
case r.state is
|
when s_idle => -- idle state
|
when s_idle => -- idle state
|
n.tcntsnd := (others=>'0'); -- keep send delay timer zero
|
n.tcntsnd := (others=>'0'); -- keep send delay timer zero
|
if r.req_stsnd = '1' then -- sanity timer request pending
|
if r.req_stsnd = '1' then -- sanity timer request pending
|
n.state := s_stsnd;
|
n.state := s_stsnd;
|
elsif r.req_pgsnd = '1' then -- prog. gen. request pending
|
elsif r.req_pgsnd = '1' then -- prog. gen. request pending
|
n.state := s_pgsnd;
|
n.state := s_pgsnd;
|
end if;
|
end if;
|
|
|
when s_clear => -- handle acr clr
|
when s_clear => -- handle acr clr
|
ibhold := r.ibsel; -- keep req pending if selected
|
ibhold := r.ibsel; -- keep req pending if selected
|
-- r.req_clear is set when in this state and cause a reset in prog_regs
|
-- r.req_clear is set when in this state and cause a reset in prog_regs
|
-- --> n.req_clear := '0';
|
-- --> n.req_clear := '0';
|
-- --> n.state := s_idle;
|
-- --> n.state := s_idle;
|
|
|
when s_stsnd => -- handle st transmit
|
when s_stsnd => -- handle st transmit
|
if tcntsnd_end = '1' then -- send delay expired
|
if tcntsnd_end = '1' then -- send delay expired
|
n.req_stsnd := '0'; -- clear st transmit request
|
n.req_stsnd := '0'; -- clear st transmit request
|
iout.req := '1'; -- do transmit
|
iout.req := '1'; -- do transmit
|
iout.stf := '1'; -- signal type = st
|
iout.stf := '1'; -- signal type = st
|
iout.imask := r.ste_sie; -- int enables
|
iout.imask := r.ste_sie; -- int enables
|
iout.bmask := r.ste_sbe; -- boot enables
|
iout.bmask := r.ste_sbe; -- boot enables
|
iout.par := not r.stc_stp; -- send parity (odd incl. stf!)
|
iout.par := not r.stc_stp; -- send parity (odd incl. stf!)
|
iout.frm := '0'; -- frame always ok
|
iout.frm := '0'; -- frame always ok
|
n.state := s_idle;
|
n.state := s_idle;
|
end if;
|
end if;
|
|
|
when s_pgsnd => -- handle pg transmit
|
when s_pgsnd => -- handle pg transmit
|
if tcntsnd_end = '1' then -- send delay expired
|
if tcntsnd_end = '1' then -- send delay expired
|
n.req_pgsnd := '0'; -- clear pg transmit request
|
n.req_pgsnd := '0'; -- clear pg transmit request
|
iout.req := '1'; -- do transmit
|
iout.req := '1'; -- do transmit
|
iout.stf := '0'; -- signal type = pg
|
iout.stf := '0'; -- signal type = pg
|
iout.imask := r.pge_pie; -- int enables
|
iout.imask := r.pge_pie; -- int enables
|
iout.bmask := r.pge_pbe; -- boot enables
|
iout.bmask := r.pge_pbe; -- boot enables
|
iout.par := r.pgc_ptp; -- send parity
|
iout.par := r.pgc_ptp; -- send parity
|
iout.frm := '0'; -- frame always ok
|
iout.frm := '0'; -- frame always ok
|
n.state := s_idle;
|
n.state := s_idle;
|
end if;
|
end if;
|
|
|
when others => null;
|
when others => null;
|
end case;
|
end case;
|
|
|
if r.mtc_enmxd = '1' then -- if maintenance mux enabled
|
if r.mtc_enmxd = '1' then -- if maintenance mux enabled
|
iout.stf := r.mtc_mttp; -- force type from mtc_mttp
|
iout.stf := r.mtc_mttp; -- force type from mtc_mttp
|
iout.frm := r.mtc_mfrm; -- force frame from mtc_mfrm
|
iout.frm := r.mtc_mfrm; -- force frame from mtc_mfrm
|
end if;
|
end if;
|
|
|
-- ibus transactions
|
-- ibus transactions
|
if r.ibsel = '1' and ibhold='0' then
|
if r.ibsel = '1' and ibhold='0' then
|
|
|
if IB_MREQ.addr(1 downto 1) = "0" then -- ACR -- access control reg -----
|
if IB_MREQ.addr(1 downto 1) = "0" then -- ACR -- access control reg -----
|
|
|
idout(acr_ibf_sid) := SID;
|
idout(acr_ibf_sid) := SID;
|
idout(acr_ibf_ac) := r.acr_ac;
|
idout(acr_ibf_ac) := r.acr_ac;
|
|
|
if ibw1 = '1' then
|
if ibw1 = '1' then
|
if IB_MREQ.din(acr_ibf_clr) = '1' then
|
if IB_MREQ.din(acr_ibf_clr) = '1' then
|
n.req_clear := '1';
|
n.req_clear := '1';
|
n.state := s_clear;
|
n.state := s_clear;
|
end if;
|
end if;
|
end if;
|
end if;
|
if ibw0 = '1' then
|
if ibw0 = '1' then
|
n.acr_ac := IB_MREQ.din(acr_ibf_ac);
|
n.acr_ac := IB_MREQ.din(acr_ibf_ac);
|
end if;
|
end if;
|
|
|
else -- ADR -- access data reg --------
|
else -- ADR -- access data reg --------
|
case r.acr_ac is
|
case r.acr_ac is
|
|
|
when ac_pge => -- PGE -- program gen enables --------
|
when ac_pge => -- PGE -- program gen enables --------
|
|
|
idout(pge_ibf_pbe) := r.pge_pbe;
|
idout(pge_ibf_pbe) := r.pge_pbe;
|
idout(pge_ibf_pie) := r.pge_pie;
|
idout(pge_ibf_pie) := r.pge_pie;
|
|
|
if IB_MREQ.we = '1' then
|
if IB_MREQ.we = '1' then
|
|
|
if r.req_pgsnd = '0' then -- no pg transmit pending
|
if r.req_pgsnd = '0' then -- no pg transmit pending
|
if ibw1 = '1' then
|
if ibw1 = '1' then
|
n.pge_pbe := IB_MREQ.din(pge_ibf_pbe);
|
n.pge_pbe := IB_MREQ.din(pge_ibf_pbe);
|
end if;
|
end if;
|
if ibw0 = '1' then
|
if ibw0 = '1' then
|
n.pge_pie := IB_MREQ.din(pge_ibf_pie);
|
n.pge_pie := IB_MREQ.din(pge_ibf_pie);
|
end if;
|
end if;
|
else -- if collision with pg transmit
|
else -- if collision with pg transmit
|
n.pgc_pgrmr := '1'; -- set pge refused flag
|
n.pgc_pgrmr := '1'; -- set pge refused flag
|
end if;
|
end if;
|
|
|
end if;
|
end if;
|
|
|
when ac_pgc => -- PGC -- program gen control/status -
|
when ac_pgc => -- PGC -- program gen control/status -
|
|
|
idout(pgc_ibf_err) := r.pgc_grj or r.pgc_pgrmr or r.pgc_strmr;
|
idout(pgc_ibf_err) := r.pgc_grj or r.pgc_pgrmr or r.pgc_strmr;
|
idout(pgc_ibf_grj) := r.pgc_grj;
|
idout(pgc_ibf_grj) := r.pgc_grj;
|
idout(pgc_ibf_pgrmr) := r.pgc_pgrmr;
|
idout(pgc_ibf_pgrmr) := r.pgc_pgrmr;
|
idout(pgc_ibf_strmr) := r.pgc_strmr;
|
idout(pgc_ibf_strmr) := r.pgc_strmr;
|
idout(pgc_ibf_rdy) := not r.req_pgsnd;
|
idout(pgc_ibf_rdy) := not r.req_pgsnd;
|
idout(pgc_ibf_sid) := eff_id;
|
idout(pgc_ibf_sid) := eff_id;
|
idout(pgc_ibf_ip) := int_or;
|
idout(pgc_ibf_ip) := int_or;
|
idout(pgc_ibf_ie) := r.pgc_ie;
|
idout(pgc_ibf_ie) := r.pgc_ie;
|
idout(pgc_ibf_ptp) := r.pgc_ptp;
|
idout(pgc_ibf_ptp) := r.pgc_ptp;
|
|
|
if ibw1 = '1' then
|
if ibw1 = '1' then
|
if IB_MREQ.din(pgc_ibf_err) = '1' then -- '1' written into ERR
|
if IB_MREQ.din(pgc_ibf_err) = '1' then -- '1' written into ERR
|
n.pgc_grj := '0'; -- clears GRJ
|
n.pgc_grj := '0'; -- clears GRJ
|
n.pgc_pgrmr := '0'; -- clears PGRMR
|
n.pgc_pgrmr := '0'; -- clears PGRMR
|
n.pgc_strmr := '0'; -- clears STRMR
|
n.pgc_strmr := '0'; -- clears STRMR
|
end if;
|
end if;
|
end if;
|
end if;
|
if ibw0 = '1' then
|
if ibw0 = '1' then
|
n.pgc_ie := IB_MREQ.din(pgc_ibf_ie);
|
n.pgc_ie := IB_MREQ.din(pgc_ibf_ie);
|
n.pgc_ptp := IB_MREQ.din(pgc_ibf_ptp);
|
n.pgc_ptp := IB_MREQ.din(pgc_ibf_ptp);
|
if IB_MREQ.din(pgc_ibf_go) = '1' then -- GO bit set
|
if IB_MREQ.din(pgc_ibf_go) = '1' then -- GO bit set
|
if r.req_pgsnd = '0' then -- if ready (no pgsnd pend)
|
if r.req_pgsnd = '0' then -- if ready (no pgsnd pend)
|
n.req_pgsnd := '1'; -- request pgsnd
|
n.req_pgsnd := '1'; -- request pgsnd
|
else -- if not ready
|
else -- if not ready
|
n.pgc_grj := '1'; -- set go reject flag
|
n.pgc_grj := '1'; -- set go reject flag
|
end if;
|
end if;
|
end if;
|
end if;
|
end if;
|
end if;
|
|
|
when ac_ste => -- STE -- sanity timer enables -------
|
when ac_ste => -- STE -- sanity timer enables -------
|
|
|
idout(ste_ibf_sbe) := r.ste_sbe;
|
idout(ste_ibf_sbe) := r.ste_sbe;
|
idout(ste_ibf_sie) := r.ste_sie;
|
idout(ste_ibf_sie) := r.ste_sie;
|
|
|
if IB_MREQ.we = '1' then
|
if IB_MREQ.we = '1' then
|
|
|
if r.req_stsnd = '0' then -- no st transmit pending
|
if r.req_stsnd = '0' then -- no st transmit pending
|
if ibw1 = '1' then
|
if ibw1 = '1' then
|
n.ste_sbe := IB_MREQ.din(ste_ibf_sbe);
|
n.ste_sbe := IB_MREQ.din(ste_ibf_sbe);
|
end if;
|
end if;
|
if ibw0 = '1' then
|
if ibw0 = '1' then
|
n.ste_sie := IB_MREQ.din(ste_ibf_sie);
|
n.ste_sie := IB_MREQ.din(ste_ibf_sie);
|
end if;
|
end if;
|
|
|
else -- if collision with st transmit
|
else -- if collision with st transmit
|
n.pgc_strmr := '1'; -- set ste refused flag
|
n.pgc_strmr := '1'; -- set ste refused flag
|
end if;
|
end if;
|
|
|
end if;
|
end if;
|
|
|
when ac_stc => -- STC -- sanity timer control/status
|
when ac_stc => -- STC -- sanity timer control/status
|
|
|
idout(stc_ibf_count) := r.stc_count;
|
idout(stc_ibf_count) := r.stc_count;
|
idout(stc_ibf_tmo) := r.stc_tmo;
|
idout(stc_ibf_tmo) := r.stc_tmo;
|
idout(stc_ibf_lke) := r.stc_lke;
|
idout(stc_ibf_lke) := r.stc_lke;
|
idout(stc_ibf_stp) := r.stc_stp;
|
idout(stc_ibf_stp) := r.stc_stp;
|
idout(stc_ibf_enb) := r.stc_enb;
|
idout(stc_ibf_enb) := r.stc_enb;
|
|
|
if ibw1 = '1' then
|
if ibw1 = '1' then
|
n.stc_count := IB_MREQ.din(stc_ibf_count); -- reset st count
|
n.stc_count := IB_MREQ.din(stc_ibf_count); -- reset st count
|
n.tcnt256 := (others=>'0'); -- reset usec count
|
n.tcnt256 := (others=>'0'); -- reset usec count
|
end if;
|
end if;
|
if ibw0 = '1' then
|
if ibw0 = '1' then
|
if IB_MREQ.din(stc_ibf_tmo) = '1' then -- 1 written into TMO
|
if IB_MREQ.din(stc_ibf_tmo) = '1' then -- 1 written into TMO
|
n.stc_tmo := '0';
|
n.stc_tmo := '0';
|
end if;
|
end if;
|
n.stc_lke := IB_MREQ.din(stc_ibf_lke);
|
n.stc_lke := IB_MREQ.din(stc_ibf_lke);
|
n.stc_stp := IB_MREQ.din(stc_ibf_stp);
|
n.stc_stp := IB_MREQ.din(stc_ibf_stp);
|
n.stc_enb := IB_MREQ.din(stc_ibf_enb);
|
n.stc_enb := IB_MREQ.din(stc_ibf_enb);
|
end if;
|
end if;
|
|
|
when ac_msk => -- MSK -- input masks ----------------
|
when ac_msk => -- MSK -- input masks ----------------
|
|
|
idout(msk_ibf_bm) := r.msk_bm;
|
idout(msk_ibf_bm) := r.msk_bm;
|
idout(msk_ibf_im) := r.msk_im;
|
idout(msk_ibf_im) := r.msk_im;
|
|
|
if ibw1 = '1' then
|
if ibw1 = '1' then
|
n.msk_bm := IB_MREQ.din(msk_ibf_bm);
|
n.msk_bm := IB_MREQ.din(msk_ibf_bm);
|
end if;
|
end if;
|
if ibw0 = '1' then
|
if ibw0 = '1' then
|
n.msk_im := IB_MREQ.din(msk_ibf_im);
|
n.msk_im := IB_MREQ.din(msk_ibf_im);
|
end if;
|
end if;
|
|
|
when ac_pgf => -- PGF -- program generated flags ----
|
when ac_pgf => -- PGF -- program generated flags ----
|
|
|
idout(pgf_ibf_pbf) := r.pgf_pbf;
|
idout(pgf_ibf_pbf) := r.pgf_pbf;
|
idout(pgf_ibf_pif) := r.pgf_pif;
|
idout(pgf_ibf_pif) := r.pgf_pif;
|
|
|
if ibw1 = '1' then
|
if ibw1 = '1' then
|
n.pgf_pbf := r.pgf_pbf and not IB_MREQ.din(pgf_ibf_pbf);
|
n.pgf_pbf := r.pgf_pbf and not IB_MREQ.din(pgf_ibf_pbf);
|
end if;
|
end if;
|
if ibw0 = '1' then
|
if ibw0 = '1' then
|
n.pgf_pif := r.pgf_pif and not IB_MREQ.din(pgf_ibf_pif);
|
n.pgf_pif := r.pgf_pif and not IB_MREQ.din(pgf_ibf_pif);
|
end if;
|
end if;
|
|
|
when ac_stf => -- STF -- sanity timer flags ---------
|
when ac_stf => -- STF -- sanity timer flags ---------
|
|
|
idout(stf_ibf_sbf) := r.stf_sbf;
|
idout(stf_ibf_sbf) := r.stf_sbf;
|
idout(stf_ibf_sif) := r.stf_sif;
|
idout(stf_ibf_sif) := r.stf_sif;
|
|
|
if ibw1 = '1' then
|
if ibw1 = '1' then
|
n.stf_sbf := r.stf_sbf and not IB_MREQ.din(stf_ibf_sbf);
|
n.stf_sbf := r.stf_sbf and not IB_MREQ.din(stf_ibf_sbf);
|
end if;
|
end if;
|
if ibw0 = '1' then
|
if ibw0 = '1' then
|
n.stf_sif := r.stf_sif and not IB_MREQ.din(stf_ibf_sif);
|
n.stf_sif := r.stf_sif and not IB_MREQ.din(stf_ibf_sif);
|
end if;
|
end if;
|
|
|
when ac_dcf => -- DCE -- disconnect flags -----------
|
when ac_dcf => -- DCE -- disconnect flags -----------
|
|
|
idout(dcf_ibf_brk) := r.dcf_brk;
|
idout(dcf_ibf_brk) := r.dcf_brk;
|
idout(dcf_ibf_dcf) := r.dcf_dcf;
|
idout(dcf_ibf_dcf) := r.dcf_dcf;
|
|
|
if ibw0 = '1' then
|
if ibw0 = '1' then
|
n.dcf_dcf := r.dcf_dcf and not IB_MREQ.din(dcf_ibf_dcf);
|
n.dcf_dcf := r.dcf_dcf and not IB_MREQ.din(dcf_ibf_dcf);
|
end if;
|
end if;
|
|
|
when ac_exc => -- EXC -- exceptions -----------------
|
when ac_exc => -- EXC -- exceptions -----------------
|
|
|
idout(exc_ibf_ui) := r.exc_ui;
|
idout(exc_ibf_ui) := r.exc_ui;
|
idout(exc_ibf_rte) := r.exc_rte;
|
idout(exc_ibf_rte) := r.exc_rte;
|
|
|
if ibw1 = '1' then
|
if ibw1 = '1' then
|
n.exc_ui := r.exc_ui and not IB_MREQ.din(exc_ibf_ui);
|
n.exc_ui := r.exc_ui and not IB_MREQ.din(exc_ibf_ui);
|
end if;
|
end if;
|
if ibw0 = '1' then
|
if ibw0 = '1' then
|
n.exc_rte := r.exc_rte and not IB_MREQ.din(exc_ibf_rte);
|
n.exc_rte := r.exc_rte and not IB_MREQ.din(exc_ibf_rte);
|
end if;
|
end if;
|
|
|
when ac_mtc => -- MTC -- maintenance control --------
|
when ac_mtc => -- MTC -- maintenance control --------
|
|
|
idout(mtc_ibf_mttp) := r.mtc_mttp;
|
idout(mtc_ibf_mttp) := r.mtc_mttp;
|
idout(mtc_ibf_mfrm) := r.mtc_mfrm;
|
idout(mtc_ibf_mfrm) := r.mtc_mfrm;
|
idout(mtc_ibf_mid) := r.mtc_mid;
|
idout(mtc_ibf_mid) := r.mtc_mid;
|
idout(mtc_ibf_dsbt) := r.mtc_dsbt;
|
idout(mtc_ibf_dsbt) := r.mtc_dsbt;
|
idout(mtc_ibf_enmxd) := r.mtc_enmxd;
|
idout(mtc_ibf_enmxd) := r.mtc_enmxd;
|
idout(mtc_ibf_enmlp) := r.mtc_enmlp;
|
idout(mtc_ibf_enmlp) := r.mtc_enmlp;
|
idout(mtc_ibf_dsdrv) := r.mtc_dsdrv;
|
idout(mtc_ibf_dsdrv) := r.mtc_dsdrv;
|
|
|
if ibw1 = '1' then
|
if ibw1 = '1' then
|
n.mtc_mttp := IB_MREQ.din(mtc_ibf_mttp);
|
n.mtc_mttp := IB_MREQ.din(mtc_ibf_mttp);
|
n.mtc_mfrm := IB_MREQ.din(mtc_ibf_mfrm);
|
n.mtc_mfrm := IB_MREQ.din(mtc_ibf_mfrm);
|
n.mtc_mid := IB_MREQ.din(mtc_ibf_mid);
|
n.mtc_mid := IB_MREQ.din(mtc_ibf_mid);
|
end if;
|
end if;
|
if ibw0 = '1' then
|
if ibw0 = '1' then
|
n.mtc_dsbt := IB_MREQ.din(mtc_ibf_dsbt);
|
n.mtc_dsbt := IB_MREQ.din(mtc_ibf_dsbt);
|
n.mtc_enmxd := IB_MREQ.din(mtc_ibf_enmxd);
|
n.mtc_enmxd := IB_MREQ.din(mtc_ibf_enmxd);
|
n.mtc_enmlp := IB_MREQ.din(mtc_ibf_enmlp);
|
n.mtc_enmlp := IB_MREQ.din(mtc_ibf_enmlp);
|
n.mtc_dsdrv := IB_MREQ.din(mtc_ibf_dsdrv);
|
n.mtc_dsdrv := IB_MREQ.din(mtc_ibf_dsdrv);
|
end if;
|
end if;
|
|
|
when others => -- access to undefined AC code -------
|
when others => -- access to undefined AC code -------
|
null;
|
null;
|
|
|
end case;
|
end case;
|
|
|
if unsigned(r.acr_ac) <= unsigned(ac_exc) then -- if ac 0,..,10
|
if unsigned(r.acr_ac) <= unsigned(ac_exc) then -- if ac 0,..,10
|
if IB_MREQ.rmw = '0' then -- if not 1st part of rmw
|
if IB_MREQ.rmw = '0' then -- if not 1st part of rmw
|
n.acr_ac := unsigned(r.acr_ac) + 1; -- autoincrement
|
n.acr_ac := unsigned(r.acr_ac) + 1; -- autoincrement
|
end if;
|
end if;
|
end if;
|
end if;
|
|
|
end if;
|
end if;
|
|
|
end if;
|
end if;
|
|
|
-- sanity timer
|
-- sanity timer
|
|
|
if tcnt256_end = '1' then -- if 256 usec expired (and enabled)
|
if tcnt256_end = '1' then -- if 256 usec expired (and enabled)
|
n.stc_count := unsigned(r.stc_count) - 1;
|
n.stc_count := unsigned(r.stc_count) - 1;
|
if unsigned(r.stc_count) = 0 then -- if sanity timer expired
|
if unsigned(r.stc_count) = 0 then -- if sanity timer expired
|
n.stc_tmo := '1'; -- set timeout flag
|
n.stc_tmo := '1'; -- set timeout flag
|
n.req_stsnd := '1'; -- request st transmit
|
n.req_stsnd := '1'; -- request st transmit
|
if r.stc_lke = '1' then -- if lockup enabled
|
if r.stc_lke = '1' then -- if lockup enabled
|
n.req_lock := '1'; -- request lockup
|
n.req_lock := '1'; -- request lockup
|
end if;
|
end if;
|
end if;
|
end if;
|
end if;
|
end if;
|
|
|
-- process iist bus inputs
|
-- process iist bus inputs
|
|
|
if r.mtc_enmlp = '1' then -- if mainentance loop
|
if r.mtc_enmlp = '1' then -- if mainentance loop
|
for i in eff_bus'range loop
|
for i in eff_bus'range loop
|
eff_bus(i) := iout; -- local signal on all input ports
|
eff_bus(i) := iout; -- local signal on all input ports
|
eff_bus(i).dcf := '0'; -- all ports considered connected
|
eff_bus(i).dcf := '0'; -- all ports considered connected
|
end loop; -- i
|
end loop; -- i
|
end if;
|
end if;
|
|
|
for i in eff_bus'range loop
|
for i in eff_bus'range loop
|
|
|
par_err := eff_bus(i).stf xor
|
par_err := eff_bus(i).stf xor
|
eff_bus(i).imask(0) xor eff_bus(i).imask(1) xor
|
eff_bus(i).imask(0) xor eff_bus(i).imask(1) xor
|
eff_bus(i).imask(2) xor eff_bus(i).imask(3) xor
|
eff_bus(i).imask(2) xor eff_bus(i).imask(3) xor
|
eff_bus(i).bmask(0) xor eff_bus(i).bmask(1) xor
|
eff_bus(i).bmask(0) xor eff_bus(i).bmask(1) xor
|
eff_bus(i).bmask(2) xor eff_bus(i).bmask(3) xor
|
eff_bus(i).bmask(2) xor eff_bus(i).bmask(3) xor
|
not eff_bus(i).par;
|
not eff_bus(i).par;
|
|
|
act_ibit := eff_bus(i).imask(conv_integer(unsigned(eff_id)));
|
act_ibit := eff_bus(i).imask(conv_integer(unsigned(eff_id)));
|
act_bbit := eff_bus(i).bmask(conv_integer(unsigned(eff_id)));
|
act_bbit := eff_bus(i).bmask(conv_integer(unsigned(eff_id)));
|
|
|
n.dcf_brk(i) := eff_bus(i).dcf; -- trace dcf state in brk
|
n.dcf_brk(i) := eff_bus(i).dcf; -- trace dcf state in brk
|
|
|
if eff_bus(i).dcf = '1' then -- if disconnected
|
if eff_bus(i).dcf = '1' then -- if disconnected
|
if r.msk_im(i) = '0' then -- if not disabled
|
if r.msk_im(i) = '0' then -- if not disabled
|
n.dcf_dcf(i) := '1'; -- set dcf flag
|
n.dcf_dcf(i) := '1'; -- set dcf flag
|
end if;
|
end if;
|
|
|
else -- if connected
|
else -- if connected
|
if eff_bus(i).req = '1' then -- request received ?
|
if eff_bus(i).req = '1' then -- request received ?
|
if eff_bus(i).frm='1' or -- frame error seen ?
|
if eff_bus(i).frm='1' or -- frame error seen ?
|
par_err='1' then -- parity error seen ?
|
par_err='1' then -- parity error seen ?
|
if r.msk_im(i) = '0' then -- if not disabled
|
if r.msk_im(i) = '0' then -- if not disabled
|
n.exc_rte(i) := '1'; -- set rte flag
|
n.exc_rte(i) := '1'; -- set rte flag
|
end if;
|
end if;
|
|
|
else -- here if valid request seen
|
else -- here if valid request seen
|
if act_ibit = '1' then -- interrupt request
|
if act_ibit = '1' then -- interrupt request
|
if r.msk_im(i) = '1' then -- if disabled
|
if r.msk_im(i) = '1' then -- if disabled
|
n.exc_ui(i) := '1'; -- set ui flag
|
n.exc_ui(i) := '1'; -- set ui flag
|
else -- if enabled
|
else -- if enabled
|
n.req_lock := '0'; -- release lock
|
n.req_lock := '0'; -- release lock
|
if eff_bus(i).stf = '0' then -- and pg request
|
if eff_bus(i).stf = '0' then -- and pg request
|
n.pgf_pif(i) := '1'; -- set pif flag
|
n.pgf_pif(i) := '1'; -- set pif flag
|
else -- and st request
|
else -- and st request
|
n.stf_sif(i) := '1'; -- set sif flag
|
n.stf_sif(i) := '1'; -- set sif flag
|
end if;
|
end if;
|
end if;
|
end if;
|
end if; -- act_ibit='1'
|
end if; -- act_ibit='1'
|
|
|
if act_bbit = '1' then -- boot request
|
if act_bbit = '1' then -- boot request
|
if r.msk_bm(i) = '1' then -- if msk disabled
|
if r.msk_bm(i) = '1' then -- if msk disabled
|
n.exc_ui(i) := '1'; -- set ui flag
|
n.exc_ui(i) := '1'; -- set ui flag
|
else -- if msk enabled
|
else -- if msk enabled
|
if r.mtc_dsbt = '0' then -- if mtc enabled
|
if r.mtc_dsbt = '0' then -- if mtc enabled
|
n.req_lock := '0'; -- release lock
|
n.req_lock := '0'; -- release lock
|
n.req_boot := '1'; -- request boot
|
n.req_boot := '1'; -- request boot
|
end if;
|
end if;
|
if eff_bus(i).stf = '0' then -- and pg request
|
if eff_bus(i).stf = '0' then -- and pg request
|
n.pgf_pbf(i) := '1'; -- set pbf flag
|
n.pgf_pbf(i) := '1'; -- set pbf flag
|
else -- and st request
|
else -- and st request
|
n.stf_sbf(i) := '1'; -- set sbf flag
|
n.stf_sbf(i) := '1'; -- set sbf flag
|
end if;
|
end if;
|
end if;
|
end if;
|
end if; -- act_bbit='1'
|
end if; -- act_bbit='1'
|
|
|
end if;
|
end if;
|
|
|
end if;
|
end if;
|
end if;
|
end if;
|
end loop;
|
end loop;
|
|
|
-- process cpu->iist responses
|
-- process cpu->iist responses
|
if IIST_SRES.ack_lock = '1' then
|
if IIST_SRES.ack_lock = '1' then
|
n.req_lock := '0';
|
n.req_lock := '0';
|
end if;
|
end if;
|
if IIST_SRES.ack_boot = '1' then
|
if IIST_SRES.ack_boot = '1' then
|
n.req_boot := '0';
|
n.req_boot := '0';
|
end if;
|
end if;
|
|
|
N_REGS <= n;
|
N_REGS <= n;
|
|
|
IB_SRES.dout <= idout;
|
IB_SRES.dout <= idout;
|
IB_SRES.ack <= r.ibsel and ibreq;
|
IB_SRES.ack <= r.ibsel and ibreq;
|
IB_SRES.busy <= ibhold and ibreq;
|
IB_SRES.busy <= ibhold and ibreq;
|
|
|
EI_REQ <= r.pgc_ie and int_or;
|
EI_REQ <= r.pgc_ie and int_or;
|
|
|
if r.mtc_dsdrv = '1' then -- if driver disconnected
|
if r.mtc_dsdrv = '1' then -- if driver disconnected
|
iout.dcf := '1'; -- set dcf flag
|
iout.dcf := '1'; -- set dcf flag
|
iout.req := '0'; -- suppress requests
|
iout.req := '0'; -- suppress requests
|
end if;
|
end if;
|
IIST_OUT <= iout; -- and finally send it out...
|
IIST_OUT <= iout; -- and finally send it out...
|
|
|
IIST_MREQ.lock <= r.req_lock;
|
IIST_MREQ.lock <= r.req_lock;
|
IIST_MREQ.boot <= r.req_boot;
|
IIST_MREQ.boot <= r.req_boot;
|
|
|
end process proc_next;
|
end process proc_next;
|
|
|
|
|
end syn;
|
end syn;
|
|
|