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-- $Id: pdp11_dpath.vhd 314 2010-07-09 17:38:41Z mueller $
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-- $Id: pdp11_dpath.vhd 330 2010-09-19 17:43:53Z 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 2006-2010 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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-- Module Name: pdp11_dpath - syn
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-- Module Name: pdp11_dpath - syn
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-- Description: pdp11: CPU datapath
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-- Description: pdp11: CPU datapath
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--
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--
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-- Dependencies: pdp11_gpr
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-- Dependencies: pdp11_gpr
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-- pdp11_psr
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-- pdp11_psr
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-- pdp11_abox
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-- pdp11_ounit
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-- pdp11_dbox
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-- pdp11_aunit
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-- pdp11_lbox
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-- pdp11_lunit
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-- pdp11_mbox
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-- pdp11_munit
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--
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--
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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; ghdl 0.18-0.25
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-- Tool versions: xst 8.1, 8.2, 9.1, 9.2; ghdl 0.18-0.25
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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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-- 2010-09-18 300 1.2.1 rename (adlm)box->(oalm)unit
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-- 2010-06-13 305 1.2 rename CPDIN -> CP_DIN; add CP_DOUT out port;
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-- 2010-06-13 305 1.2 rename CPDIN -> CP_DIN; add CP_DOUT out port;
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-- remove CPADDR out port; drop R_CPADDR, proc_cpaddr;
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-- remove CPADDR out port; drop R_CPADDR, proc_cpaddr;
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-- added R_CPDOUT, proc_cpdout
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-- added R_CPDOUT, proc_cpdout
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-- 2009-05-30 220 1.1.6 final removal of snoopers (were already commented)
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-- 2009-05-30 220 1.1.6 final removal of snoopers (were already commented)
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-- 2008-12-14 177 1.1.5 fill gpr_* fields in DM_STAT_DP
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-- 2008-12-14 177 1.1.5 fill gpr_* fields in DM_STAT_DP
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signal CCOUT : slv4 := (others=>'0'); -- cc output from xbox's
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signal CCOUT : slv4 := (others=>'0'); -- cc output from xbox's
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signal DRES : slv16 := (others=>'0'); -- result bus
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signal DRES : slv16 := (others=>'0'); -- result bus
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signal DRESE : slv16 := (others=>'0'); -- result bus extra
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signal DRESE : slv16 := (others=>'0'); -- result bus extra
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signal ABOX_DOUT : slv16 := (others=>'0'); -- result abox
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signal OUNIT_DOUT : slv16 := (others=>'0'); -- result ounit
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signal DBOX_DOUT : slv16 := (others=>'0'); -- result dbox
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signal AUNIT_DOUT : slv16 := (others=>'0'); -- result aunit
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signal LBOX_DOUT : slv16 := (others=>'0'); -- result lbox
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signal LUNIT_DOUT : slv16 := (others=>'0'); -- result lunit
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signal MBOX_DOUT : slv16 := (others=>'0'); -- result mbox
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signal MUNIT_DOUT : slv16 := (others=>'0'); -- result munit
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signal ABOX_NZOUT : slv2 := (others=>'0'); -- nz flags abox
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signal OUNIT_NZOUT : slv2 := (others=>'0'); -- nz flags ounit
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signal ABOX_CCOUT : slv4 := (others=>'0'); -- cc flags abox
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signal OUNIT_CCOUT : slv4 := (others=>'0'); -- cc flags ounit
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signal DBOX_CCOUT : slv4 := (others=>'0'); -- cc flags dbox
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signal AUNIT_CCOUT : slv4 := (others=>'0'); -- cc flags aunit
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signal LBOX_CCOUT : slv4 := (others=>'0'); -- cc flags lbox
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signal LUNIT_CCOUT : slv4 := (others=>'0'); -- cc flags lunit
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signal MBOX_CCOUT : slv4 := (others=>'0'); -- cc flags mbox
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signal MUNIT_CCOUT : slv4 := (others=>'0'); -- cc flags munit
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subtype lal_ibf_addr is integer range 15 downto 1;
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subtype lal_ibf_addr is integer range 15 downto 1;
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subtype lah_ibf_addr is integer range 5 downto 0;
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subtype lah_ibf_addr is integer range 5 downto 0;
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constant lah_ibf_ena_22bit: integer := 6;
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constant lah_ibf_ena_22bit: integer := 6;
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constant lah_ibf_ena_ubmap: integer := 7;
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constant lah_ibf_ena_ubmap: integer := 7;
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PSW => PSW,
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PSW => PSW,
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IB_MREQ => IB_MREQ,
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IB_MREQ => IB_MREQ,
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IB_SRES => IB_SRES
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IB_SRES => IB_SRES
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);
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);
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ABOX : pdp11_abox port map (
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OUNIT : pdp11_ounit port map (
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DSRC => R_DSRC,
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DSRC => R_DSRC,
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DDST => R_DDST,
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DDST => R_DDST,
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DTMP => R_DTMP,
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DTMP => R_DTMP,
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PC => GPR_PC,
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PC => GPR_PC,
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ASEL => CNTL.abox_asel,
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ASEL => CNTL.ounit_asel,
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AZERO => CNTL.abox_azero,
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AZERO => CNTL.ounit_azero,
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IREG8 => R_IREG(7 downto 0),
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IREG8 => R_IREG(7 downto 0),
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VMDOUT => VM_DOUT,
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VMDOUT => VM_DOUT,
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CONST => CNTL.abox_const,
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CONST => CNTL.ounit_const,
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BSEL => CNTL.abox_bsel,
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BSEL => CNTL.ounit_bsel,
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OPSUB => CNTL.abox_opsub,
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OPSUB => CNTL.ounit_opsub,
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DOUT => ABOX_DOUT,
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DOUT => OUNIT_DOUT,
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NZOUT => ABOX_NZOUT
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NZOUT => OUNIT_NZOUT
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);
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);
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DBOX : pdp11_dbox port map (
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AUNIT : pdp11_aunit port map (
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DSRC => R_DSRC,
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DSRC => R_DSRC,
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DDST => R_DDST,
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DDST => R_DDST,
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CI => CCIN(0),
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CI => CCIN(0),
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SRCMOD => CNTL.dbox_srcmod,
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SRCMOD => CNTL.aunit_srcmod,
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DSTMOD => CNTL.dbox_dstmod,
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DSTMOD => CNTL.aunit_dstmod,
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CIMOD => CNTL.dbox_cimod,
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CIMOD => CNTL.aunit_cimod,
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CC1OP => CNTL.dbox_cc1op,
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CC1OP => CNTL.aunit_cc1op,
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CCMODE => CNTL.dbox_ccmode,
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CCMODE => CNTL.aunit_ccmode,
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BYTOP => CNTL.dbox_bytop,
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BYTOP => CNTL.aunit_bytop,
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DOUT => DBOX_DOUT,
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DOUT => AUNIT_DOUT,
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CCOUT => DBOX_CCOUT
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CCOUT => AUNIT_CCOUT
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);
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);
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LBOX : pdp11_lbox port map (
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LUNIT : pdp11_lunit port map (
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DSRC => R_DSRC,
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DSRC => R_DSRC,
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DDST => R_DDST,
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DDST => R_DDST,
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CCIN => CCIN,
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CCIN => CCIN,
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FUNC => CNTL.lbox_func,
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FUNC => CNTL.lunit_func,
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BYTOP => CNTL.lbox_bytop,
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BYTOP => CNTL.lunit_bytop,
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DOUT => LBOX_DOUT,
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DOUT => LUNIT_DOUT,
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CCOUT => LBOX_CCOUT
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CCOUT => LUNIT_CCOUT
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);
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);
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MBOX : pdp11_mbox port map (
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MUNIT : pdp11_munit port map (
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CLK => CLK,
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CLK => CLK,
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DSRC => R_DSRC,
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DSRC => R_DSRC,
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DDST => R_DDST,
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DDST => R_DDST,
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DTMP => R_DTMP,
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DTMP => R_DTMP,
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GPR_DSRC => GPR_DSRC,
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GPR_DSRC => GPR_DSRC,
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FUNC => CNTL.mbox_func,
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FUNC => CNTL.munit_func,
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S_DIV => CNTL.mbox_s_div,
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S_DIV => CNTL.munit_s_div,
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S_DIV_CN => CNTL.mbox_s_div_cn,
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S_DIV_CN => CNTL.munit_s_div_cn,
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S_DIV_CR => CNTL.mbox_s_div_cr,
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S_DIV_CR => CNTL.munit_s_div_cr,
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S_ASH => CNTL.mbox_s_ash,
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S_ASH => CNTL.munit_s_ash,
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S_ASH_CN => CNTL.mbox_s_ash_cn,
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S_ASH_CN => CNTL.munit_s_ash_cn,
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S_ASHC => CNTL.mbox_s_ashc,
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S_ASHC => CNTL.munit_s_ashc,
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S_ASHC_CN => CNTL.mbox_s_ashc_cn,
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S_ASHC_CN => CNTL.munit_s_ashc_cn,
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SHC_TC => STAT.shc_tc,
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SHC_TC => STAT.shc_tc,
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DIV_CR => STAT.div_cr,
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DIV_CR => STAT.div_cr,
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DIV_CQ => STAT.div_cq,
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DIV_CQ => STAT.div_cq,
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DIV_ZERO => STAT.div_zero,
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DIV_ZERO => STAT.div_zero,
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DIV_OVFL => STAT.div_ovfl,
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DIV_OVFL => STAT.div_ovfl,
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DOUT => MBOX_DOUT,
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DOUT => MUNIT_DOUT,
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DOUTE => DRESE,
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DOUTE => DRESE,
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CCOUT => MBOX_CCOUT
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CCOUT => MUNIT_CCOUT
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);
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);
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CCIN <= PSW.cc;
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CCIN <= PSW.cc;
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ABOX_CCOUT <= ABOX_NZOUT & "0" & CCIN(0); -- clear v, keep c
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OUNIT_CCOUT <= OUNIT_NZOUT & "0" & CCIN(0); -- clear v, keep c
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proc_dres_sel: process (ABOX_DOUT, DBOX_DOUT, LBOX_DOUT, MBOX_DOUT,
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proc_dres_sel: process (OUNIT_DOUT, AUNIT_DOUT, LUNIT_DOUT, MUNIT_DOUT,
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VM_DOUT, R_IREG, CP_DIN, CNTL)
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VM_DOUT, R_IREG, CP_DIN, CNTL)
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begin
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begin
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case CNTL.dres_sel is
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case CNTL.dres_sel is
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when c_dpath_res_abox => DRES <= ABOX_DOUT;
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when c_dpath_res_ounit => DRES <= OUNIT_DOUT;
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when c_dpath_res_dbox => DRES <= DBOX_DOUT;
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when c_dpath_res_aunit => DRES <= AUNIT_DOUT;
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when c_dpath_res_lbox => DRES <= LBOX_DOUT;
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when c_dpath_res_lunit => DRES <= LUNIT_DOUT;
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when c_dpath_res_mbox => DRES <= MBOX_DOUT;
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when c_dpath_res_munit => DRES <= MUNIT_DOUT;
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when c_dpath_res_vmdout => DRES <= VM_DOUT;
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when c_dpath_res_vmdout => DRES <= VM_DOUT;
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when c_dpath_res_fpdout => DRES <= (others=>'0');
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when c_dpath_res_fpdout => DRES <= (others=>'0');
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when c_dpath_res_ireg => DRES <= R_IREG;
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when c_dpath_res_ireg => DRES <= R_IREG;
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when c_dpath_res_cpdin => DRES <= CP_DIN;
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when c_dpath_res_cpdin => DRES <= CP_DIN;
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when others => null;
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when others => null;
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end case;
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end case;
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end process proc_dres_sel;
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end process proc_dres_sel;
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proc_cres_sel: process (ABOX_CCOUT, DBOX_CCOUT, LBOX_CCOUT, MBOX_CCOUT,
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proc_cres_sel: process (OUNIT_CCOUT, AUNIT_CCOUT, LUNIT_CCOUT, MUNIT_CCOUT,
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CCIN, CNTL)
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CCIN, CNTL)
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begin
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begin
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case CNTL.cres_sel is
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case CNTL.cres_sel is
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when c_dpath_res_abox => CCOUT <= ABOX_CCOUT;
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when c_dpath_res_ounit => CCOUT <= OUNIT_CCOUT;
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when c_dpath_res_dbox => CCOUT <= DBOX_CCOUT;
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when c_dpath_res_aunit => CCOUT <= AUNIT_CCOUT;
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when c_dpath_res_lbox => CCOUT <= LBOX_CCOUT;
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when c_dpath_res_lunit => CCOUT <= LUNIT_CCOUT;
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when c_dpath_res_mbox => CCOUT <= MBOX_CCOUT;
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when c_dpath_res_munit => CCOUT <= MUNIT_CCOUT;
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when c_dpath_res_vmdout => CCOUT <= CCIN;
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when c_dpath_res_vmdout => CCOUT <= CCIN;
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when c_dpath_res_fpdout => CCOUT <= "0000";
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when c_dpath_res_fpdout => CCOUT <= "0000";
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when c_dpath_res_ireg => CCOUT <= CCIN;
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when c_dpath_res_ireg => CCOUT <= CCIN;
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when c_dpath_res_cpdin => CCOUT <= CCIN;
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when c_dpath_res_cpdin => CCOUT <= CCIN;
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when others => null;
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when others => null;
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