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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