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&$clock clk

&$data_bus_min_width 0

&$entity max_mem

&$header

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

-- Copyright 2008 by USM

-- Description: Search for the maximum number in a memory.

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

&$include

   library ieee;

   use ieee.std_logic_1164.all;

   use ieee.std_logic_unsigned.all;

   library work;

   use work.usm_pkg.all;

&$generic

&$port

   -- Main clock:

   clk: in std_logic;

   -- Memory data bus:

   mem_data: in std_logic_vector(7 downto 0);

   -- Memory address bus:

   mem_addr: out std_logic_vector(6 downto 0);

&$sig_declaration

   -- Temporary maximum number

   signal max_number: std_logic_vector(mem_data'range);

   -- Copy of output:

   signal mem_addr_s: std_logic_vector(mem_addr'range);

&$opcode_def mem_addr_s

   &$mem_addr_ini

      &$cycle_def 1

         mem_addr_s <= (others => '0');

   &$mem_addr_inc

      &$cycle_def 1

         mem_addr_s <= mem_addr_s + 1;

&$end_opcode_def

&$opcode_def max_number

   &$max_number_ini

      &$cycle_def 1

         max_number <= (others => '0');

   &$max_number_assign

      &$cycle_def 1

         max_number <= mem_data;

&$end_opcode_def

&$jump_opcode_def

   &$condition jump_if_mem_addr_eq_last

      mem_addr_s = (mem_addr_s'range => '1')

   &$condition jump_if_mem_data_lt_max

      mem_data < max_number

&$prog_code

   mem_addr_ini

   max_number_ini

   loop1: jump_if_mem_data_lt_max next1

      max_number_assign

      next1: jump_if_mem_addr_eq_last end

      mem_addr_inc

   jump loop1

&$extra_code

   mem_addr <= mem_addr_s;

&$end_usm