kkrizka / endeavour_firmware

Testbench for playing with the Endeavour protocol used by AMACv2.

Endeavour Test Firmware

A testbench for playing with the Endeavour protocol used by AMACv2.

The documentation and the slave implementation (endeavour.v) of the protocol can be found in the AMACv2 SVN area

svn co svn+ssh://svn.cern.ch/reps/itkstrasic/AMACv2/trunk

An implementation of the Endeavour master is available in vhdl/endeavour_master.vhd.

endeavour_master interface

The endeavour_master entity is very dumb, with the software responsible for most of the work. It acts only as a (de)serializer for the morse code, with the Tx and Rx parts kept almost completely separate. The only interaction is that the send command also clears the datavalid flag.

Generic ports

• clock - Clock used for internal logic and to time the serial line (nominal 80 MHz)
• reset - Active high reset signal to reset internal state machines
• serialin - The data sent from the the Endeavour slave
• serialout - The data sent to the the Endeavour slave

Transfer ports

• nbitsin - Number of bits to transfer from the datain
• datain - The data to transfer. The least significant nbitsin will be send, starting with bit at nbitsin-1.
• send - Pulse to send data stored in datain.
• busy - Indicates that the Tx FSM is sending data. Any calls to send will be ignored.

Receive ports

• nbitsout - Number of valid bits received from the slave.
• dataout - The data recieved from the slave, stored in the nbitsout least significant bits. The bit at nbitsout-1 was recieved first.
• datavalid - High signal indicates that dataout contains valid and complete data. Goes low after reset,when a new word is being serialized and when data was sent.
• error - Inidicates an error condition during serialization of serialin. Currently only the length of a pulse must be in the specified number of clock cycles.

The component declaration is below.

component endeavour_master is
  port (
    clock       : in  std_logic;
    reset       : in  std_logic;
    nbitsin     : in  integer range 0 to 63;    
    datain      : in  std_logic_vector(63 downto 0);
    send        : in  std_logic;
    busy        : out std_logic;
    nbitsout    : out integer range 0 to 63;
    dataout     : out std_logic_vector(63 downto 0);
    datavalid   : out std_logic;
    error       : out std_logic;    
    serialin    : in  std_logic;
    serialout   : out std_logic
    );
end component endeavour_master;

Running

The testbench uses hdlmake for compilation and Vivado's simulator (xsim) for running.

git clone https://github.com/kkrizka/endeavour_firmware.git
cd endeavour_firmware/testbench
hdlmake
make
xsim -gui tb_endeavour -t test.tcl