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

--  LEON3 Demonstration design

--  Copyright (C) 2008 Jiri Gaisler, Gaisler Research

--

--  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;

use grlib.amba.all;

use grlib.stdlib.all;

library techmap;

use techmap.gencomp.all;

library gaisler;

use gaisler.memctrl.all;

use gaisler.leon3.all;

use gaisler.uart.all;

use gaisler.misc.all;

use gaisler.net.all;

use gaisler.ata.all;

use gaisler.jtag.all;

library esa;

use esa.memoryctrl.all;

use work.config.all;

entity leon3mp is

  generic (

    fabtech : integer := CFG_FABTECH;

    memtech : integer := CFG_MEMTECH;

    padtech : integer := CFG_PADTECH;

    clktech : integer := CFG_CLKTECH;

    ncpu    : integer := CFG_NCPU;

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

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

    pclow   : integer := CFG_PCLOW;

    freq    : integer := 50000         -- frequency of main clock (used for PLLs)

    );

  port (

    resetn          : in  std_ulogic;

    clk             : in  std_ulogic;

    errorn          : out std_ulogic;

    -- flash/ssram bus

    address         : out   std_logic_vector(25 downto 1);

    data            : inout std_logic_vector(31 downto 0);

    romsn           : out std_ulogic;

    oen             : out std_logic;

    writen          : out std_logic;

    rstoutn         : out std_ulogic;

    ssram_cen       : out std_logic;

    ssram_wen       : out std_logic;

    ssram_bw        : out std_logic_vector (0 to 3);

    ssram_oen       : out std_ulogic;

    ssram_clk       : out std_ulogic;

    ssram_adscn     : out std_ulogic;

--    ssram_adsp_n : out std_ulogic;

--    ssram_adv_n : out std_ulogic;

-- pragma translate_off

    iosn            : out   std_ulogic;

-- pragma translate_on

    -- DDR 

    ddr_clk         : out std_logic;

    ddr_clkn        : out std_logic;

    ddr_cke         : out std_logic;

    ddr_csb         : out std_logic;

    ddr_web         : out std_ulogic;                       -- ddr write enable

    ddr_rasb        : out std_ulogic;                       -- ddr ras

    ddr_casb        : out std_ulogic;                       -- ddr cas

    ddr_dm          : out std_logic_vector (1 downto 0);    -- ddr dm

    ddr_dqs         : inout std_logic_vector (1 downto 0);  -- ddr dqs

    ddr_ad          : out std_logic_vector (12 downto 0);   -- ddr address

    ddr_ba          : out std_logic_vector (1 downto 0);    -- ddr bank address

    ddr_dq          : inout std_logic_vector (15 downto 0); -- ddr data

    -- debug support unit

    dsubren         : in  std_ulogic;

    dsuact          : out std_ulogic;

    -- I/O port

    gpio            : in std_logic_vector(CFG_GRGPIO_WIDTH-3 downto 0);

    -- Connections over HSMC connector

    -- LCD touch panel display

    hc_vd           : out std_logic;

    hc_hd           : out std_logic;

    hc_den          : out std_logic;

    hc_nclk         : out std_logic;

    hc_lcd_data     : out std_logic_vector(7 downto 0);

    hc_grest        : out std_logic;

    hc_scen         : out std_logic;

    hc_sda          : inout std_logic;

    hc_adc_penirq_n : in  std_logic;

    hc_adc_dout     : in  std_logic;

    hc_adc_busy     : in  std_logic;

    hc_adc_din      : out std_logic;

    hc_adc_dclk     : out std_logic;

    hc_adc_cs_n     : out std_logic;    -- Shared with video decoder

    -- Shared by video decoder and audio codec

    hc_i2c_sclk     : out std_logic;

    hc_i2c_sdat     : inout std_logic;

    -- Video decoder

    hc_td_d         : inout std_logic_vector(7 downto 0);

    hc_td_hs        : in  std_logic;

    hc_td_vs        : in  std_logic;

    hc_td_27mhz     : in  std_logic;

    hc_td_reset     : out std_logic;

    -- Audio codec

    hc_aud_adclrck  : out std_logic;

    hc_aud_adcdat   : in std_logic;

    hc_aud_daclrck  : out std_logic;

    hc_aud_dacdat   : out std_logic;

    hc_aud_bclk     : out std_logic;

    hc_aud_xck      : out std_logic;

    -- SD card

    hc_sd_dat       : inout std_logic;

    hc_sd_dat3      : inout std_logic;

    hc_sd_cmd       : inout std_logic;

    hc_sd_clk       : inout std_logic;

    -- Ethernet PHY

    hc_tx_d         : out std_logic_vector(3 downto 0);

    hc_rx_d         : in  std_logic_vector(3 downto 0);

    hc_tx_clk       : in  std_logic;

    hc_rx_clk       : in  std_logic;

    hc_tx_en        : out std_logic;

    hc_rx_dv        : in  std_logic;

    hc_rx_crs       : in  std_logic;

    hc_rx_err       : in  std_logic;

    hc_rx_col       : in  std_logic;

    hc_mdio         : inout std_logic;

    hc_mdc          : out std_logic;

    hc_eth_reset_n  : out std_logic;

    -- RX232 (console/debug UART)

    hc_uart_rxd     : in  std_logic;

    hc_uart_txd     : out std_logic;

    -- PS/2

    hc_ps2_dat      : inout std_logic;

    hc_ps2_clk      : inout std_logic;

    -- VGA/DAC

    hc_vga_data     : out std_logic_vector(9 downto 0);

    hc_vga_clock    : out std_ulogic;

    hc_vga_hs       : out std_ulogic;

    hc_vga_vs       : out std_ulogic;

    hc_vga_blank    : out std_ulogic;

    hc_vga_sync     : out std_ulogic;

    -- I2C EEPROM

    hc_id_i2cscl    : out std_logic;

    hc_id_i2cdat    : inout std_logic

    );

end;

architecture rtl of leon3mp is

  component serializer

    generic (

      length : integer := 8             -- vector length

      );

    port (

      clk   : in  std_ulogic;

      sync  : in  std_ulogic;

      ivec0 : in  std_logic_vector((length-1) downto 0);

      ivec1 : in  std_logic_vector((length-1) downto 0);

      ivec2 : in  std_logic_vector((length-1) downto 0);

      ovec  : out std_logic_vector((length-1) downto 0)

      );

  end component;

  component altera_eek_clkgen

    generic (

      clk0_mul  : integer := 1;

      clk0_div  : integer := 1;

      clk1_mul  : integer := 1;

      clk1_div  : integer := 1;

      clk_freq : integer := 25000);

    port (

      inclk0 : in  std_ulogic;

      clk0   : out std_ulogic;

      clk0x3 : out std_ulogic;

      clksel : in  std_logic_vector(1 downto 0);

      locked : out std_ulogic);

  end component;

  constant blength   : integer := 12;

  constant fifodepth : integer := 8;

  constant maxahbm : integer := NCPU+CFG_AHB_UART+CFG_AHB_JTAG+CFG_LCD_ENABLE+

                                CFG_SVGA_ENABLE+CFG_GRETH;

  signal vcc, gnd    : std_logic_vector(7 downto 0);

  signal memi, smemi : memory_in_type;

  signal memo, smemo : memory_out_type;

  signal wpo         : wprot_out_type;

  signal ddsi  : ddrmem_in_type;

  signal ddso  : ddrmem_out_type;

  signal ddrclkfb, ssrclkfb, ddr_clkl, ddr_clk90l, ddr_clknl, ddr_clk270l : std_ulogic;

  signal ddr_clkv       : std_logic_vector(2 downto 0);

  signal ddr_clkbv      : std_logic_vector(2 downto 0);

  signal ddr_ckev       : std_logic_vector(1 downto 0);

  signal ddr_csbv       : std_logic_vector(1 downto 0);

  signal ddr_adl        : std_logic_vector (13 downto 0);

  signal clklock, lock, clkml, rst, ndsuact : std_ulogic;

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

  signal ddrclk, ddrrst : std_ulogic;

  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, rawrstn, ssram_clkl : std_ulogic;

  signal cgi                : clkgen_in_type;

  signal cgo                : clkgen_out_type;

  signal u1i, dui           : uart_in_type;

  signal u1o, duo           : uart_out_type;

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

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

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

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

  signal dsui : dsu_in_type;

  signal dsuo : dsu_out_type;

  signal gpti : gptimer_in_type;

  signal gpioi : gpio_in_type;

  signal gpioo : gpio_out_type;

  signal ps2i  : ps2_in_type;

  signal ps2o  : ps2_out_type;

  signal i2ci : i2c_in_type;

  signal i2co : i2c_out_type;

  signal spii : spi_in_type;

  signal spio : spi_out_type;

  signal slvsel : std_logic_vector(CFG_SPICTRL_SLVS-1 downto 0);

  signal spmi : spimctrl_in_type;

  signal spmo : spimctrl_out_type;

  signal ethi : eth_in_type;

  signal etho : eth_out_type;

  signal lcdo       : apbvga_out_type;

  signal lcd_data   : std_logic_vector(7 downto 0);

  signal lcd_den    : std_ulogic;

  signal lcd_grest  : std_ulogic;

  signal lcdspii    : spi_in_type;

  signal lcdspio    : spi_out_type;

  signal lcdslvsel  : std_logic_vector(1 downto 0);

  signal lcdclksel  : std_logic_vector(1 downto 0);

  signal lcdclk     : std_ulogic;

  signal lcdclk3x   : std_ulogic;

  signal lcdclklck  : std_ulogic;

  signal vgao       : apbvga_out_type;

  signal vga_data   : std_logic_vector(9 downto 0);

  signal vgaclksel  : std_logic_vector(1 downto 0);

  signal vgaclk     : std_ulogic;

  signal vgaclk3x   : std_ulogic;

  signal vgaclklck  : std_ulogic;

  constant IOAEN : integer := 1;

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

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

  signal lclk, lclkout  : std_ulogic;

  signal dsubre : std_ulogic;

  attribute syn_keep : boolean;

  attribute syn_keep of clkm : signal is true;

  attribute syn_keep of clkml : signal is true;

  attribute syn_keep of lcdclk : signal is true;

  attribute syn_keep of lcdclk3x : signal is true;

  attribute syn_keep of vgaclk : signal is true;

  attribute syn_keep of vgaclk3x : signal is true;

begin

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

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

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

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

  cgi.pllctrl <= "00"; cgi.pllrst <= not resetn; cgi.pllref <= '0';

  clklock <=  cgo.clklock and lock and lcdclklck and vgaclklck;

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

  clkgen0 : clkgen  -- clock generator using toplevel generic 'freq'

    generic map (tech => CFG_CLKTECH, clk_mul => CFG_CLKMUL,

                 clk_div => CFG_CLKDIV, sdramen => 1,

                 freq => freq)

    port map (clkin => lclk, pciclkin => gnd(0), clk => clkm, clkn => open,

              clk2x => open, sdclk => ssram_clkl, pciclk => open,

              cgi => cgi, cgo => cgo);

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

        port map (ssram_clk, ssram_clkl);

  rst0 : rstgen                         -- reset generator

    port map (resetn, clkm, clklock, rstn, rawrstn);

  rstoutn <= resetn;

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

---  AVOID BUS CONTENTION --------------------------------------------

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

  -- This design uses the ethernet PHY and we must therefore disable the

  -- video decoder and stay away from the touch panel.

  -- Video coder

  hc_td_reset <= '0';                   -- Video Decoder Reset

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

---  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 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, NCPU-1)

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

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

    end generate;

    errorn_pad : outpad 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   => NCPU, tbits => 30, tech => memtech, irq => 0, kbytes => CFG_ATBSZ)

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

      dsui.enable <= '1';

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

      dsuact_pad : outpad generic map (tech => padtech) port map (dsuact, dsuo.active);

    end generate;

  end generate;

  nodcom : if CFG_DSU = 0 generate ahbso(2) <= ahbs_none; end generate;

  dcomgen : if CFG_AHB_UART = 1 generate

    dcom0 : ahbuart                     -- Debug UART

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

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

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

    dsutx_pad : outpad generic map (tech => padtech) port map (hc_uart_txd, 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 => NCPU+CFG_AHB_UART)

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

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

  end generate;

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

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

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

  mg2 : if CFG_MCTRL_LEON2 = 1 generate         -- LEON2 memory controller

    sr1 :mctrl generic map (hindex => 0, pindex => 0, paddr => 0,

        ramaddr => 16#400#+16#600#*CFG_DDRSP, rammask =>16#F00#, srbanks => 1,

        sden => 0, ram16 => 1)

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

  end generate;

  memi.brdyn  <= '1'; memi.bexcn <= '1';

  memi.writen <= '1'; memi.wrn <= "1111"; memi.bwidth <= "01";

  ssr0 : if CFG_SSCTRL = 1 generate

    ssrctrl0 : ssrctrl generic map (hindex => 0, pindex => 0,

        iomask => 0, ramaddr => 16#400#+16#600#*CFG_DDRSP,

        bus16 => CFG_SSCTRLP16)

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

  end generate;

  mg0 : if (CFG_MCTRL_LEON2 + CFG_SSCTRL) = 0 generate   -- no prom/sram pads

    apbo(0) <= apb_none; ahbso(0) <= ahbs_none;

    roms_pad : outpad generic map (tech => padtech) port map (romsn, vcc(0));

  end generate;

  mgpads : if (CFG_MCTRL_LEON2 + CFG_SSCTRL) /= 0 generate       -- prom/sram pads

    addr_pad : outpadv generic map (width => 25, tech => padtech)

      port map (address, memo.address(25 downto 1));

    roms_pad : outpad generic map (tech => padtech)

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

    oen_pad : outpad generic map (tech => padtech)

      port map (oen, memo.oen);

    wri_pad : outpad generic map (tech => padtech)

      port map (writen, memo.writen);

-- pragma translate_off

    iosn_pad : outpad generic map (tech => padtech)

      port map (iosn, memo.iosn);

-- pragma translate_on

--    ssram_adv_n_pad : outpad generic map (tech => padtech) 

--      port map (ssram_adv_n, vcc(0)); 

--    ssram_adsp_n_pad : outpad generic map (tech => padtech) 

--      port map (ssram_adsp_n, gnd(0)); 

    ssram_adscn_pad : outpad generic map (tech => padtech)

        port map (ssram_adscn, gnd(0));

    ssrams_pad : outpad generic map ( tech => padtech)

        port map (ssram_cen, memo.ramsn(0));

    ssram_oen_pad  : outpad generic map (tech => padtech)

        port map (ssram_oen, memo.oen);

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

        port map (ssram_bw, memo.wrn);

    ssram_wri_pad  : outpad generic map (tech => padtech)

        port map (ssram_wen, memo.writen);

    data_pad : iopadvv generic map (tech => padtech, width => 32)

        port map (data(31 downto 0), memo.data(31 downto 0),

                  memo.vbdrive, memi.data(31 downto 0));

  end generate;

  ddrsp0 : if (CFG_DDRSP /= 0) generate

    ddrc0 : ddrspa generic map ( fabtech => fabtech, memtech => memtech,

        hindex => 3, haddr => 16#400#, hmask => 16#F00#, ioaddr => 1,

        pwron => CFG_DDRSP_INIT, MHz => BOARD_FREQ/1000, rskew => CFG_DDRSP_RSKEW,

        clkmul => CFG_DDRSP_FREQ/5, clkdiv => 10, ahbfreq => CPU_FREQ/1000,

        col => CFG_DDRSP_COL, Mbyte => CFG_DDRSP_SIZE, ddrbits => 16, regoutput => 1)

     port map (

        resetn, rstn, lclk, clkm, lock, clkml, clkml, ahbsi, ahbso(3),

        ddr_clkv, ddr_clkbv, open, gnd(0),

        ddr_ckev, ddr_csbv, ddr_web, ddr_rasb, ddr_casb,

        ddr_dm, ddr_dqs, ddr_adl, ddr_ba, ddr_dq);

        ddr_ad <= ddr_adl(12 downto 0);

        ddr_clk <= ddr_clkv(0); ddr_clkn <= ddr_clkbv(0);

        ddr_cke <= ddr_ckev(0); ddr_csb <= ddr_csbv(0);

  end generate;

  ddrsp1 : if (CFG_DDRSP = 0) generate

    ddr_cke <= '0'; ddr_csb <= '1'; lock <= '1';

  end generate;

  spimc: if CFG_SPIMCTRL = 1 generate -- SPI Memory Controller

    spimctrl0 : spimctrl

      generic map (hindex => 4,

                   hirq => 9,

                   faddr => 16#b00#,

                   fmask  => 16#f00#,

                   ioaddr => 16#002#,

                   iomask => 16#fff#,

                   spliten => CFG_SPLIT,

                   oepol   => 0,

                   sdcard => CFG_SPIMCTRL_SDCARD,

                   readcmd => CFG_SPIMCTRL_READCMD,

                   dummybyte => CFG_SPIMCTRL_DUMMYBYTE,

                   dualoutput => CFG_SPIMCTRL_DUALOUTPUT,

                   scaler => CFG_SPIMCTRL_SCALER,

                   altscaler => CFG_SPIMCTRL_ASCALER,

                   pwrupcnt => CFG_SPIMCTRL_PWRUPCNT)

      port map (rstn, clkm, ahbsi, ahbso(4), spmi, spmo);

    miso_pad : inpad generic map (tech => padtech)

      port map (hc_sd_dat, spmi.miso);

    mosi_pad : outpad generic map (tech => padtech)

      port map (hc_sd_cmd, spmo.mosi);

    sck_pad  : outpad generic map (tech => padtech)

      port map (hc_sd_clk, spmo.sck);

    slvsel0_pad : iopad generic map (tech => padtech)

      port map (hc_sd_dat3, spmo.csn, spmo.cdcsnoen, spmi.cd);

  end generate;

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

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

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

  apb0 : apbctrl                        -- AHB/APB bridge

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

    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.ctsn <= '0'; u1i.extclk <= '0';

    upads : if CFG_AHB_UART = 0 generate

      u1i.rxd <= hc_uart_rxd; hc_uart_txd <= u1o.txd;

    end generate;

  end generate;

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

  irqctrl : if CFG_IRQ3_ENABLE /= 0 generate

    irqctrl0 : irqmp                    -- interrupt controller

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

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

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

  end generate;

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

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

    grgpio0: grgpio

    generic map(pindex => 5, paddr => 5, imask => CFG_GRGPIO_IMASK, nbits => CFG_GRGPIO_WIDTH)

    port map(rst => rstn, clk => clkm, apbi => apbi, apbo => apbo(5),

    gpioi => gpioi, gpioo => gpioo);

    pio_pads : for i in 0 to CFG_GRGPIO_WIDTH-3 generate

        gpioi.din(i) <= gpio(i);

    end generate;

    gpioi.din(3) <= hc_adc_penirq_n;

    gpioi.din(4) <= hc_adc_busy;

  end generate;

  ps2 : if CFG_PS2_ENABLE /= 0 generate  -- PS/2 unit

    ps20 : apbps2 generic map(pindex => 6, paddr => 6, pirq => 6)

    port map(rstn, clkm, apbi, apbo(6), ps2i, ps2o);

  end generate;

  nops2 : if CFG_PS2_ENABLE = 0 generate

    apbo(4) <= apb_none; ps2o <= ps2o_none;

  end generate;

  ps2clk_pad : iopad generic map (tech => padtech)

      port map (hc_ps2_clk, ps2o.ps2_clk_o, ps2o.ps2_clk_oe, ps2i.ps2_clk_i);

  ps2data_pad : iopad generic map (tech => padtech)

        port map (hc_ps2_dat, ps2o.ps2_data_o, ps2o.ps2_data_oe, ps2i.ps2_data_i);

  i2cm: if CFG_I2C_ENABLE = 1 generate  -- I2C master

    i2c0 : i2cmst

      generic map (pindex => 8, paddr => 8, pmask => 16#FFF#, pirq => 11)

      port map (rstn, clkm, apbi, apbo(8), i2ci, i2co);

    -- The EEK does not use a bi-directional line for the I2C clock

    i2ci.scl <= i2co.scloen;            -- No clock stretch possible

    -- When SCL output enable is activated the line should go low

    i2c_scl_pad : outpad generic map (tech => padtech)

      port map (hc_id_i2cscl, i2co.scloen);

    i2c_sda_pad : iopad generic map (tech => padtech)

      port map (hc_id_i2cdat, i2co.sda, i2co.sdaoen, i2ci.sda);

  end generate i2cm;

  spic: if CFG_SPICTRL_ENABLE = 1 generate  -- SPI controller

    spi1 : spictrl

    generic map (pindex => 9, paddr  => 9, pmask  => 16#fff#, pirq => 9,

                 fdepth => CFG_SPICTRL_FIFO, slvselen => CFG_SPICTRL_SLVREG,

                 slvselsz => CFG_SPICTRL_SLVS)

    port map (rstn, clkm, apbi, apbo(9), spii, spio, slvsel);

   miso_pad : iopad generic map (tech => padtech)

     port map (hc_sd_dat, spio.miso, spio.misooen, spii.miso);

   mosi_pad : iopad generic map (tech => padtech)

     port map (hc_sd_cmd, spio.mosi, spio.mosioen, spii.mosi);

   sck_pad  : iopad generic map (tech => padtech)

     port map (hc_sd_clk, spio.sck, spio.sckoen, spii.sck);

   slvsel_pad : outpad generic map (tech => padtech)

     port map (hc_sd_dat3, slvsel(0));