Subversion Repositories spacewire_light

-----------------------------------------------------------------------------

--  LEON3 Demonstration design

--  Copyright (C) 2004 Jiri Gaisler, Gaisler Research

--

--  Modified by Joris van Rantwijk for use with SpaceWire Light.

------------------------------------------------------------------------------

--  This program is free software; you can redistribute it and/or modify

--  it under the terms of the GNU General Public License as published by

--  the Free Software Foundation; either version 2 of the License, or

--  (at your option) any later version.

--

--  This program is distributed in the hope that it will be useful,

--  but WITHOUT ANY WARRANTY; without even the implied warranty of

--  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

--  GNU General Public License for more details.

--

--  You should have received a copy of the GNU General Public License

--  along with this program; if not, write to the Free Software

--  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA 

------------------------------------------------------------------------------

library ieee;

use ieee.std_logic_1164.all;

library grlib, techmap;

use grlib.amba.all;

use grlib.stdlib.all;

use techmap.gencomp.all;

library gaisler;

use gaisler.memctrl.all;

use gaisler.leon3.all;

use gaisler.uart.all;

use gaisler.misc.all;

use gaisler.can.all;

use gaisler.net.all;

use gaisler.jtag.all;

use gaisler.spacewire.all;

use gaisler.grusb.all;

use gaisler.ata.all;

library esa;

use esa.memoryctrl.all;

library unisim;

use unisim.vcomponents.DCM;

use work.config.all;

-- These statements are used in case SpaceWire Light is synthesized locally,

-- separate from the rest of GRLIB.

use work.spwpkg.all;

use work.spwambapkg.all;

---- The following statements should be used instead if SpaceWire Light

---- has been integrated into GRLIB.

-- library opencores;

-- use opencores.spwpkg.all;

-- use opencores.spwambapkg.all;

entity leon3mp is

  generic (

    fabtech       : integer := CFG_FABTECH;

    memtech       : integer := CFG_MEMTECH;

    padtech       : integer := CFG_PADTECH;

    clktech       : integer := CFG_CLKTECH;

    disas         : integer := CFG_DISAS;       -- Enable disassembly to console

    dbguart       : integer := CFG_DUART;       -- Print UART on console

    pclow         : integer := CFG_PCLOW

  );

  port (

    resetn        : in  std_ulogic;

    clk           : in  std_ulogic;     -- 50 MHz main clock

    clk3          : in  std_ulogic;     -- 25 MHz ethernet clock

    pllref        : in  std_ulogic;

    errorn        : out std_ulogic;

    wdogn         : out std_ulogic;

    address       : out std_logic_vector(27 downto 0);

    data          : inout std_logic_vector(31 downto 0);

    ramsn         : out std_logic_vector (4 downto 0);

    ramoen        : out std_logic_vector (4 downto 0);

    rwen          : out std_logic_vector (3 downto 0);

    oen           : out std_ulogic;

    writen        : out std_ulogic;

    read          : out std_ulogic;

    iosn          : out std_ulogic;

    bexcn         : in  std_ulogic;                     -- DSU rx data

    brdyn         : in  std_ulogic;                     -- DSU rx data

    romsn         : out std_logic_vector (1 downto 0);

    sdclk         : out std_ulogic;

    sdcsn         : out std_logic_vector (1 downto 0);    -- sdram chip select

    sdwen         : out std_ulogic;                       -- sdram write enable

    sdrasn        : out std_ulogic;                       -- sdram ras

    sdcasn        : out std_ulogic;                       -- sdram cas

    sddqm         : out std_logic_vector (3 downto 0);    -- sdram dqm

    dsuen         : in std_ulogic;

    dsubre        : in std_ulogic;

    dsuact        : out std_ulogic;

    txd1          : out std_ulogic;                     -- UART1 tx data

    rxd1          : in  std_ulogic;                     -- UART1 rx data

    ctsn1         : in  std_ulogic;                     -- UART1 rx data

    rtsn1         : out std_ulogic;                     -- UART1 rx data

    txd2          : out std_ulogic;                     -- UART2 tx data

    rxd2          : in  std_ulogic;                     -- UART2 rx data

    ctsn2         : in  std_ulogic;                     -- UART1 rx data

    rtsn2         : out std_ulogic;                     -- UART1 rx data

    pio           : inout std_logic_vector(17 downto 0);         -- I/O port

    emdio         : inout std_logic;            -- ethernet PHY interface

    etx_clk       : in std_ulogic;

    erx_clk       : in std_ulogic;

    erxd          : in std_logic_vector(3 downto 0);

    erx_dv        : in std_ulogic;

    erx_er        : in std_ulogic;

    erx_col       : in std_ulogic;

    erx_crs       : in std_ulogic;

    emdint        : in std_ulogic;

    etxd          : out std_logic_vector(3 downto 0);

    etx_en        : out std_ulogic;

    etx_er        : out std_ulogic;

    emdc          : out std_ulogic;

    ps2clk        : inout std_logic_vector(1 downto 0);

    ps2data       : inout std_logic_vector(1 downto 0);

    vid_clock     : out std_ulogic;

    vid_blankn    : out std_ulogic;

    vid_syncn     : out std_ulogic;

    vid_hsync     : out std_ulogic;

    vid_vsync     : out std_ulogic;

    vid_r         : out std_logic_vector(7 downto 0);

    vid_g         : out std_logic_vector(7 downto 0);

    vid_b         : out std_logic_vector(7 downto 0);

    spw_clk       : in  std_ulogic;

    spw_rxdp      : in  std_logic_vector(0 to 2);

    spw_rxdn      : in  std_logic_vector(0 to 2);

    spw_rxsp      : in  std_logic_vector(0 to 2);

    spw_rxsn      : in  std_logic_vector(0 to 2);

    spw_txdp      : out std_logic_vector(0 to 2);

    spw_txdn      : out std_logic_vector(0 to 2);

    spw_txsp      : out std_logic_vector(0 to 2);

    spw_txsn      : out std_logic_vector(0 to 2);

    usb_clkout    : in std_ulogic;

    usb_d         : inout std_logic_vector(15 downto 0);

    usb_linestate : in std_logic_vector(1 downto 0);

    usb_opmode    : out std_logic_vector(1 downto 0);

    usb_reset     : out std_ulogic;

    usb_rxactive  : in std_ulogic;

    usb_rxerror   : in std_ulogic;

    usb_rxvalid   : in std_ulogic;

    usb_suspend   : out std_ulogic;

    usb_termsel   : out std_ulogic;

    usb_txready   : in std_ulogic;

    usb_txvalid   : out std_ulogic;

    usb_validh    : inout std_ulogic;

    usb_xcvrsel   : out std_ulogic;

    usb_vbus      : in std_ulogic;

    ata_rstn  : out std_logic;

    ata_data  : inout std_logic_vector(15 downto 0);

    ata_da    : out std_logic_vector(2 downto 0);

    ata_cs0   : out std_logic;

    ata_cs1   : out std_logic;

    ata_dior  : out std_logic;

    ata_diow  : out std_logic;

    ata_iordy : in std_logic;

    ata_intrq : in std_logic;

    ata_dmarq : in std_logic;

    ata_dmack : out std_logic;

    --ata_dasp  : in std_logic

    ata_csel  : out std_logic

        );

end;

architecture rtl of leon3mp is

attribute syn_netlist_hierarchy : boolean;

attribute syn_netlist_hierarchy of rtl : architecture is false;

constant blength : integer := 12;

constant fifodepth : integer := 8;

constant maxahbm : integer := CFG_NCPU+CFG_AHB_UART+CFG_GRETH+

        CFG_AHB_JTAG+CFG_SPW_NUM*CFG_SPW_EN+CFG_GRUSB_DCL+CFG_SVGA_ENABLE+

        CFG_ATA+CFG_GRUSBDC;

signal vcc, gnd   : std_logic_vector(4 downto 0);

signal memi  : memory_in_type;

signal memo  : memory_out_type;

signal wpo   : wprot_out_type;

signal sdi   : sdctrl_in_type;

signal sdo   : sdram_out_type;

signal sdo2, sdo3 : sdctrl_out_type;

signal apbi  : apb_slv_in_type;

signal apbo  : apb_slv_out_vector := (others => apb_none);

signal ahbsi : ahb_slv_in_type;

signal ahbso : ahb_slv_out_vector := (others => ahbs_none);

signal ahbmi : ahb_mst_in_type;

signal ahbmo : ahb_mst_out_vector := (others => ahbm_none);

signal clkm, rstn, rstraw, sdclkl : std_ulogic;

signal cgi, cgi2   : clkgen_in_type;

signal cgo, cgo2   : clkgen_out_type;

signal u1i, u2i, dui : uart_in_type;

signal u1o, u2o, duo : uart_out_type;

signal irqi : irq_in_vector(0 to CFG_NCPU-1);

signal irqo : irq_out_vector(0 to CFG_NCPU-1);

signal dbgi : l3_debug_in_vector(0 to CFG_NCPU-1);

signal dbgo : l3_debug_out_vector(0 to CFG_NCPU-1);

signal dsui : dsu_in_type;

signal dsuo : dsu_out_type;

signal ethi, ethi1, ethi2 : eth_in_type;

signal etho, etho1, etho2 : eth_out_type;

signal gpti : gptimer_in_type;

signal gpto : gptimer_out_type;

signal gpioi : gpio_in_type;

signal gpioo : gpio_out_type;

signal can_lrx, can_ltx   : std_logic_vector(0 to 7);

signal lclk, rst, ndsuact, wdogl : std_ulogic;

signal tck, tckn, tms, tdi, tdo : std_ulogic;

signal ethclk : std_ulogic;

signal kbdi  : ps2_in_type;

signal kbdo  : ps2_out_type;

signal moui  : ps2_in_type;

signal mouo  : ps2_out_type;

signal vgao  : apbvga_out_type;

constant BOARD_FREQ : integer := 50000;   -- input frequency in KHz

constant CPU_FREQ : integer := BOARD_FREQ * CFG_CLKMUL / CFG_CLKDIV;  -- cpu frequency in KHz

constant IOAEN : integer := CFG_CAN + CFG_ATA + CFG_GRUSBDC;

signal stati : ahbstat_in_type;

signal spw_clkl   : std_ulogic;

signal spw_tick_in: std_logic;

signal spw_di: std_logic;

signal spw_si: std_logic;

signal spw_do: std_logic;

signal spw_so: std_logic;

signal uclk : std_ulogic;

signal usbi : grusb_in_type;

signal usbo : grusb_out_type;

signal idei : ata_in_type;

signal ideo : ata_out_type;

constant SPW_LOOP_BACK : integer := 0;

signal dac_clk, video_clk, clk50 : std_logic;  -- signals to vga_clkgen.

signal clk_sel : std_logic_vector(1 downto 0);

attribute keep : boolean;

attribute syn_keep : boolean;

attribute syn_preserve : boolean;

attribute syn_keep of clk50 : signal is true;

attribute syn_preserve of clk50 : signal is true;

attribute keep of clk50 : signal is true;

attribute syn_keep of video_clk : signal is true;

attribute syn_preserve of video_clk : signal is true;

attribute keep of video_clk : signal is true;

attribute keep of spw_clkl : signal is true;

begin

----------------------------------------------------------------------

---  Reset and Clock generation  -------------------------------------

----------------------------------------------------------------------

  vcc <= (others => '1'); gnd <= (others => '0');

  cgi.pllctrl <= "00"; cgi.pllrst <= rstraw;

  pllref_pad : clkpad generic map (tech => padtech) port map (pllref, cgi.pllref);

  ethclk_pad : inpad generic map (tech => padtech) port map(clk3, ethclk);

  clk_pad : clkpad generic map (tech => padtech) port map (clk, lclk);

  clkgen0 : clkgen              -- clock generator

    generic map (clktech, CFG_CLKMUL, CFG_CLKDIV, CFG_MCTRL_SDEN,

        CFG_CLK_NOFB, 0, 0, 0, BOARD_FREQ)

    port map (lclk, lclk, clkm, open, open, sdclkl, open, cgi, cgo, open, clk50);

  sdclk_pad : outpad generic map (tech => padtech, slew => 1, strength => 24)

        port map (sdclk, sdclkl);

  resetn_pad : inpad generic map (tech => padtech) port map (resetn, rst);

  rst0 : rstgen                 -- reset generator

  port map (rst, clkm, cgo.clklock, rstn, rstraw);

----------------------------------------------------------------------

---  AHB CONTROLLER --------------------------------------------------

----------------------------------------------------------------------

  ahb0 : ahbctrl                -- AHB arbiter/multiplexer

  generic map (defmast => CFG_DEFMST, split => CFG_SPLIT,

        rrobin => CFG_RROBIN, ioaddr => CFG_AHBIO,

        ioen => IOAEN, nahbm => maxahbm, nahbs => 8)

  port map (rstn, clkm, ahbmi, ahbmo, ahbsi, ahbso);

----------------------------------------------------------------------

---  LEON3 processor and DSU -----------------------------------------

----------------------------------------------------------------------

  l3 : if CFG_LEON3 = 1 generate

    cpu : for i in 0 to CFG_NCPU-1 generate

      u0 : leon3s                       -- LEON3 processor      

      generic map (i, fabtech, memtech, CFG_NWIN, CFG_DSU, CFG_FPU, CFG_V8,

        0, CFG_MAC, pclow, 0, CFG_NWP, CFG_ICEN, CFG_IREPL, CFG_ISETS, CFG_ILINE,

        CFG_ISETSZ, CFG_ILOCK, CFG_DCEN, CFG_DREPL, CFG_DSETS, CFG_DLINE, CFG_DSETSZ,

        CFG_DLOCK, CFG_DSNOOP, CFG_ILRAMEN, CFG_ILRAMSZ, CFG_ILRAMADDR, CFG_DLRAMEN,

        CFG_DLRAMSZ, CFG_DLRAMADDR, CFG_MMUEN, CFG_ITLBNUM, CFG_DTLBNUM, CFG_TLB_TYPE, CFG_TLB_REP,

        CFG_LDDEL, disas, CFG_ITBSZ, CFG_PWD, CFG_SVT, CFG_RSTADDR, CFG_NCPU-1, 0, 0,

        CFG_MMU_PAGE, CFG_BP)

      port map (clkm, rstn, ahbmi, ahbmo(i), ahbsi, ahbso,

                irqi(i), irqo(i), dbgi(i), dbgo(i));

    end generate;

    errorn_pad : odpad generic map (tech => padtech) port map (errorn, dbgo(0).error);

    dsugen : if CFG_DSU = 1 generate

      dsu0 : dsu3                       -- LEON3 Debug Support Unit

      generic map (hindex => 2, haddr => 16#900#, hmask => 16#F00#,

         ncpu => CFG_NCPU, tbits => 30, tech => memtech, irq => 0, kbytes => CFG_ATBSZ)

      port map (rstn, clkm, ahbmi, ahbsi, ahbso(2), dbgo, dbgi, dsui, dsuo);

      dsuen_pad : inpad generic map (tech => padtech) port map (dsuen, dsui.enable);

      dsubre_pad : inpad generic map (tech => padtech) port map (dsubre, dsui.break);

      dsuact_pad : outpad generic map (tech => padtech) port map (dsuact, ndsuact);

      ndsuact <= not dsuo.active;

    end generate;

  end generate;

  nodsu : if CFG_DSU = 0 generate

    dsuo.tstop <= '0'; dsuo.active <= '0';

  end generate;

  dcomgen : if CFG_AHB_UART = 1 generate

    dcom0: ahbuart              -- Debug UART

    generic map (hindex => CFG_NCPU, pindex => 7, paddr => 7)

    port map (rstn, clkm, dui, duo, apbi, apbo(7), ahbmi, ahbmo(CFG_NCPU));

    dsurx_pad : inpad generic map (tech => padtech) port map (rxd2, dui.rxd);

    dsutx_pad : outpad generic map (tech => padtech) port map (txd2, duo.txd);

  end generate;

  nouah : if CFG_AHB_UART = 0 generate apbo(7) <= apb_none; end generate;

  ahbjtaggen0 :if CFG_AHB_JTAG = 1 generate

    ahbjtag0 : ahbjtag generic map(tech => fabtech, hindex => CFG_NCPU+CFG_AHB_UART)

      port map(rstn, clkm, tck, tms, tdi, tdo, ahbmi, ahbmo(CFG_NCPU+CFG_AHB_UART),

               open, open, open, open, open, open, open, gnd(0));

  end generate;

----------------------------------------------------------------------

---  Memory controllers ----------------------------------------------

----------------------------------------------------------------------

  memi.writen <= '1'; memi.wrn <= "1111"; memi.bwidth <= "00";

  brdyn_pad : inpad generic map (tech => padtech) port map (brdyn, memi.brdyn);

  bexcn_pad : inpad generic map (tech => padtech) port map (bexcn, memi.bexcn);

  mctrl0 : mctrl generic map (hindex => 0, pindex => 0,

        paddr => 0, srbanks => 2, ram8 => CFG_MCTRL_RAM8BIT,

        ram16 => CFG_MCTRL_RAM16BIT, sden => CFG_MCTRL_SDEN,

        invclk => CFG_CLK_NOFB, sepbus => CFG_MCTRL_SEPBUS,

        pageburst => CFG_MCTRL_PAGE)

  port map (rstn, clkm, memi, memo, ahbsi, ahbso(0), apbi, apbo(0), wpo, sdo);

  sdpads : if CFG_MCTRL_SDEN = 1 generate               -- SDRAM controller

      sdwen_pad : outpad generic map (tech => padtech)

           port map (sdwen, sdo.sdwen);

      sdras_pad : outpad generic map (tech => padtech)

           port map (sdrasn, sdo.rasn);

      sdcas_pad : outpad generic map (tech => padtech)

           port map (sdcasn, sdo.casn);

      sddqm_pad : outpadv generic map (width =>4, tech => padtech)

           port map (sddqm, sdo.dqm(3 downto 0));

  end generate;

  sdcsn_pad : outpadv generic map (width =>2, tech => padtech)

           port map (sdcsn, sdo.sdcsn);

  addr_pad : outpadv generic map (width => 28, tech => padtech)

        port map (address, memo.address(27 downto 0));

  rams_pad : outpadv generic map (width => 5, tech => padtech)

        port map (ramsn, memo.ramsn(4 downto 0));

  roms_pad : outpadv generic map (width => 2, tech => padtech)

        port map (romsn, memo.romsn(1 downto 0));

  oen_pad  : outpad generic map (tech => padtech)

        port map (oen, memo.oen);

  rwen_pad : outpadv generic map (width => 4, tech => padtech)

        port map (rwen, memo.wrn);

  roen_pad : outpadv generic map (width => 5, tech => padtech)

        port map (ramoen, memo.ramoen(4 downto 0));

  wri_pad  : outpad generic map (tech => padtech)

        port map (writen, memo.writen);

  read_pad : outpad generic map (tech => padtech)

        port map (read, memo.read);

  iosn_pad : outpad generic map (tech => padtech)

        port map (iosn, memo.iosn);

  bdr : for i in 0 to 3 generate

      data_pad : iopadv generic map (tech => padtech, width => 8)

      port map (data(31-i*8 downto 24-i*8), memo.data(31-i*8 downto 24-i*8),

        memo.bdrive(i), memi.data(31-i*8 downto 24-i*8));

  end generate;

----------------------------------------------------------------------

---  APB Bridge and various periherals -------------------------------

----------------------------------------------------------------------

  apb0 : apbctrl                                -- AHB/APB bridge

  generic map (hindex => 1, haddr => CFG_APBADDR, nslaves => 16)

  port map (rstn, clkm, ahbsi, ahbso(1), apbi, apbo );

  ua1 : if CFG_UART1_ENABLE /= 0 generate

    uart1 : apbuart                     -- UART 1

    generic map (pindex => 1, paddr => 1,  pirq => 2, console => dbguart,

        fifosize => CFG_UART1_FIFO)

    port map (rstn, clkm, apbi, apbo(1), u1i, u1o);

    u1i.extclk <= '0';

    rxd1_pad : inpad generic map (tech => padtech) port map (rxd1, u1i.rxd);

    txd1_pad : outpad generic map (tech => padtech) port map (txd1, u1o.txd);

    cts1_pad : inpad generic map (tech => padtech) port map (ctsn1, u1i.ctsn);

    rts1_pad : outpad generic map (tech => padtech) port map (rtsn1, u1o.rtsn);

  end generate;

  noua0 : if CFG_UART1_ENABLE = 0 generate apbo(1) <= apb_none; end generate;

  ua2 : if CFG_UART2_ENABLE /= 0 generate

    uart2 : apbuart                     -- UART 2

    generic map (pindex => 9, paddr => 9,  pirq => 3, fifosize => CFG_UART2_FIFO)

    port map (rstn, clkm, apbi, apbo(9), u2i, u2o);

    u2i.extclk <= '0';

    rxd2_pad : inpad generic map (tech => padtech) port map (rxd2, u2i.rxd);

    txd2_pad : outpad generic map (tech => padtech) port map (txd2, u2o.txd);

    cts2_pad : inpad generic map (tech => padtech) port map (ctsn2, u2i.ctsn);

    rts2_pad : outpad generic map (tech => padtech) port map (rtsn2, u2o.rtsn);

  end generate;

  noua1 : if CFG_UART2_ENABLE = 0 generate

    apbo(9) <= apb_none;  rtsn2 <= '0';

  end generate;

  irqctrl : if CFG_IRQ3_ENABLE /= 0 generate

    irqctrl0 : irqmp                    -- interrupt controller

    generic map (pindex => 2, paddr => 2, ncpu => CFG_NCPU)

    port map (rstn, clkm, apbi, apbo(2), irqo, irqi);

  end generate;

  irq3 : if CFG_IRQ3_ENABLE = 0 generate

    x : for i in 0 to CFG_NCPU-1 generate

      irqi(i).irl <= "0000";

    end generate;

    apbo(2) <= apb_none;

  end generate;

  gpt : if CFG_GPT_ENABLE /= 0 generate

    timer0 : gptimer                    -- timer unit

    generic map (pindex => 3, paddr => 3, pirq => CFG_GPT_IRQ,

        sepirq => CFG_GPT_SEPIRQ, sbits => CFG_GPT_SW, ntimers => CFG_GPT_NTIM,

        nbits => CFG_GPT_TW, wdog => CFG_GPT_WDOGEN*CFG_GPT_WDOG)

    port map (rstn, clkm, apbi, apbo(3), gpti, gpto);

    gpti.dhalt <= dsuo.tstop; gpti.extclk <= '0';

  end generate;

  wden : if CFG_GPT_WDOGEN /= 0 generate

    wdogl <= gpto.wdogn or not rstn;

    wdogn_pad : odpad generic map (tech => padtech) port map (wdogn, wdogl);

  end generate;

  wddis : if CFG_GPT_WDOGEN = 0 generate

    wdogn_pad : odpad generic map (tech => padtech) port map (wdogn, vcc(0));

  end generate;

  nogpt : if CFG_GPT_ENABLE = 0 generate apbo(3) <= apb_none; end generate;

  kbd : if CFG_KBD_ENABLE /= 0 generate

    ps21 : apbps2 generic map(pindex => 4, paddr => 4, pirq => 4)

      port map(rstn, clkm, apbi, apbo(4), moui, mouo);

    ps20 : apbps2 generic map(pindex => 5, paddr => 5, pirq => 5)

      port map(rstn, clkm, apbi, apbo(5), kbdi, kbdo);

  end generate;

  nokbd : if CFG_KBD_ENABLE = 0 generate

        apbo(4) <= apb_none; mouo <= ps2o_none;

        apbo(5) <= apb_none; kbdo <= ps2o_none;

  end generate;

  kbdclk_pad : iopad generic map (tech => padtech)

      port map (ps2clk(0),kbdo.ps2_clk_o, kbdo.ps2_clk_oe, kbdi.ps2_clk_i);

  kbdata_pad : iopad generic map (tech => padtech)

        port map (ps2data(0), kbdo.ps2_data_o, kbdo.ps2_data_oe, kbdi.ps2_data_i);

  mouclk_pad : iopad generic map (tech => padtech)

      port map (ps2clk(1),mouo.ps2_clk_o, mouo.ps2_clk_oe, moui.ps2_clk_i);

  mouata_pad : iopad generic map (tech => padtech)

        port map (ps2data(1), mouo.ps2_data_o, mouo.ps2_data_oe, moui.ps2_data_i);

  vga : if CFG_VGA_ENABLE /= 0 generate

    vga0 : apbvga generic map(memtech => memtech, pindex => 6, paddr => 6)

       port map(rstn, clkm, ethclk, apbi, apbo(6), vgao);

    video_clock_pad : outpad generic map ( tech => padtech)

        port map (vid_clock, video_clk);

    video_clk <= not ethclk;

   end generate;

  -- Note: SVGA graphics support removed to make room for SpaceWire Light

  assert CFG_SVGA_ENABLE = 0 report "SVGA graphics not supported";

  svga : if CFG_SVGA_ENABLE /= 0 generate

    ahbmo(CFG_NCPU+CFG_AHB_UART+CFG_AHB_JTAG) <= ahbm_none;

    apbo(6) <= apb_none;

    vgao <= vgao_none;

    video_clk <= not clkm;

    video_clock_pad : outpad generic map ( tech => padtech)

        port map (vid_clock, video_clk);

  end generate;

  novga : if (CFG_VGA_ENABLE = 0 and CFG_SVGA_ENABLE = 0) generate

    apbo(6) <= apb_none; vgao <= vgao_none;

    video_clk <= not clkm;

    video_clock_pad : outpad generic map ( tech => padtech)

        port map (vid_clock, video_clk);

  end generate;

  blank_pad : outpad generic map (tech => padtech)

        port map (vid_blankn, vgao.blank);

  comp_sync_pad : outpad generic map (tech => padtech)

        port map (vid_syncn, vgao.comp_sync);

  vert_sync_pad : outpad generic map (tech => padtech)

        port map (vid_vsync, vgao.vsync);

  horiz_sync_pad : outpad generic map (tech => padtech)

        port map (vid_hsync, vgao.hsync);

  video_out_r_pad : outpadv generic map (width => 8, tech => padtech)

        port map (vid_r, vgao.video_out_r);

  video_out_g_pad : outpadv generic map (width => 8, tech => padtech)

        port map (vid_g, vgao.video_out_g);

  video_out_b_pad : outpadv generic map (width => 8, tech => padtech)

        port map (vid_b, vgao.video_out_b);

  gpio0 : if CFG_GRGPIO_ENABLE /= 0 generate     -- GPIO unit

    grgpio0: grgpio

    generic map(pindex => 8, paddr => 8, imask => CFG_GRGPIO_IMASK, nbits => 18)

    port map(rst => rstn, clk => clkm, apbi => apbi, apbo => apbo(8),

    gpioi => gpioi, gpioo => gpioo);

    p0 : if (CFG_CAN = 0) or (CFG_CAN_NUM = 1) generate

      pio_pads : for i in 1 to 2 generate

        pio_pad : iopad generic map (tech => padtech)

            port map (pio(i), gpioo.dout(i), gpioo.oen(i), gpioi.din(i));

      end generate;

    end generate;

    p1 : if (CFG_CAN = 0) generate

      pio_pads : for i in 4 to 5 generate

        pio_pad : iopad generic map (tech => padtech)

            port map (pio(i), gpioo.dout(i), gpioo.oen(i), gpioi.din(i));

      end generate;

    end generate;

    pio_pad0 : iopad generic map (tech => padtech)

            port map (pio(0), gpioo.dout(0), gpioo.oen(0), gpioi.din(0));

    pio_pad1 : iopad generic map (tech => padtech)

            port map (pio(3), gpioo.dout(3), gpioo.oen(3), gpioi.din(3));

    pio_pads : for i in 6 to 17 generate

        pio_pad : iopad generic map (tech => padtech)

            port map (pio(i), gpioo.dout(i), gpioo.oen(i), gpioi.din(i));

    end generate;

  end generate;

  ahbs : if CFG_AHBSTAT = 1 generate    -- AHB status register

    ahbstat0 : ahbstat generic map (pindex => 15, paddr => 15, pirq => 7,

        nftslv => CFG_AHBSTATN)