jtag: Apply Martin Strubel JTAG implementation for ZPUjtagdbg

The current JTAG debugging capable ZPU implementation (VHDL) consists of:

- A generic, device independent JTAG module (tck, tms, tdi, tdo, trst)
- A TAP module, defining JTAG instruction and data registers
- A few control lines to/from the core (request, execute, acknowledge, ready)
  and:
  * An emulation instruction register
  * A data exchange register
- An enhanced ZPU small core state machine

1 files changed, 11 insertions, 0 deletions

diff --git a/zpu/hdl/zealot/zpu_pkg.vhdl b/zpu/hdl/zealot/zpu_pkg.vhdl
index 2a15880..751d825 100644
--- a/zpu/hdl/zealot/zpu_pkg.vhdl
+++ b/zpu/hdl/zealot/zpu_pkg.vhdl
@@ -56,6 +56,7 @@ package zpupkg is
       sp     : unsigned(31 downto 0);

       stk_a  : unsigned(31 downto 0);

       stk_b  : unsigned(31 downto 0);

+      idim   : std_logic; -- Debugging: idim flag

    end record;

 

    component Trace is

@@ -66,6 +67,7 @@ package zpupkg is
       port(

          clk_i      : in std_logic;

          dbg_i      : in zpu_dbgo_t;

+         emu_i      : in std_logic;

          stop_i     : in std_logic;

          busy_i     : in std_logic

          );

@@ -81,6 +83,15 @@ package zpupkg is
          clk_i        : in  std_logic; -- System Clock

          reset_i      : in  std_logic; -- Synchronous Reset

          interrupt_i  : in  std_logic; -- Interrupt

+

+         -- Emulation pins:

+         emureq_i     : in std_logic;

+         emuexec_i    : in std_logic;  -- exec pulse. 1 clk cycle wide!

+         emuack_o     : out std_logic;

+         emurdy_o     : out std_logic;

+         pulse_o      : out std_logic;  -- Debug pulse for event counter

+         emuir        : in std_logic_vector(OPCODE_W-1 downto 0);

+

          break_o      : out std_logic; -- Breakpoint opcode executed

          dbg_o        : out zpu_dbgo_t; -- Debug outputs (i.e. trace log)

          -- BRAM (text, data, bss and stack)