sim/cocotb/dual_parallel/dual_parallel.vhdl

   1 -- Top cell with two instantiations of the tap_controller with parallel scan chains
   2
   3 library ieee;
   4 use ieee.std_logic_1164.ALL;
   5
   6 use work.c4m_jtag.ALL;
   7
   8 entity dual_parallel is
   9   port (
  10     -- Instance 1
  11     -- ==========
  12     -- JTAG
  13     I1_TCK:     in std_logic;
  14     I1_TMS:     in std_logic;
  15     I1_TDI:     in std_logic;
  16     I1_TDO:     out std_logic;
  17     I1_TRST_N:  in std_logic;
  18
  19     -- Instance 2
  20     -- ==========
  21     -- JTAG
  22     I2_TCK:     in std_logic;
  23     I2_TMS:     in std_logic;
  24     I2_TDI:     in std_logic;
  25     I2_TDO:     out std_logic;
  26     I2_TRST_N:  in std_logic
  27   );
  28 end dual_parallel;
  29
  30 architecture rtl of dual_parallel is
  31   signal I1_PAD_IN:     std_logic;
  32   signal I1_PAD_EN:     std_logic;
  33   signal I1_PAD_OUT:    std_logic;
  34   signal I2_PAD_IN:     std_logic;
  35   signal I2_PAD_EN:     std_logic;
  36   signal I2_PAD_OUT:    std_logic;
  37 begin
  38   CTRL1: c4m_jtag_tap_controller
  39     port map (
  40       TCK => I1_TCK,
  41       TMS => I1_TMS,
  42       TDI => I1_TDI,
  43       TDO => I1_TDO,
  44       TRST_N => I1_TRST_N,
  45       STATE => open,
  46       NEXT_STATE => open,
  47       IR => open,
  48       CORE_IN => open,
  49       CORE_EN => "1",
  50       CORE_OUT => "1",
  51       PAD_IN(0) => I1_PAD_IN,
  52       PAD_EN(0) => I1_PAD_EN,
  53       PAD_OUT(0) => I1_PAD_OUT
  54     );
  55
  56   CTRL2: c4m_jtag_tap_controller
  57     port map (
  58       TCK => I2_TCK,
  59       TMS => I2_TMS,
  60       TDI => I2_TDI,
  61       TDO => I2_TDO,
  62       TRST_N => I2_TRST_N,
  63       STATE => open,
  64       NEXT_STATE => open,
  65       IR => open,
  66       CORE_IN => open,
  67       CORE_EN => "1",
  68       CORE_OUT => "0",
  69       PAD_IN(0) => I2_PAD_IN,
  70       PAD_EN(0) => I2_PAD_EN,
  71       PAD_OUT(0) => I2_PAD_OUT
  72     );
  73
  74   I1_PAD_IN <= I2_PAD_OUT when I2_PAD_EN = '1' else
  75                'Z';
  76   I2_PAD_IN <= I1_PAD_OUT when I1_PAD_EN = '1' else
  77                'Z';
  78 end rtl;