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Implementation Hints
External Command Word Legality Example
The core provides three ports (USEEXTOK, CMDVAL, and CMDOK) that allow the legal command word
set to be modified. When USEEXTOK is LOW, the core internally decides which command words are
datasheet). When USEEXTOK is HIGH, an external block decodes the CMDVAL output and generates a
CMDOK input to indicate legal command words.
The VHDL and Verilog code blocks below implement an external legality checker that does the following:
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Legalizes mode codes as per the Core1553BRT MIL-STD-1553B Remote Terminal datasheet
Disables transmits from subaddresses 26 and 27
Disables receives to subaddress 25
Only enables word counts 1 to 9 and receives to subaddress 27
The source files for these modules are provided in the source directory.
The core allows 3 μs for the legality block to decode CWVAL and generate the CMDOK value; this can
be implemented within the FPGA, as shown below.
VHDL Example
library IEEE;
use IEEE.std_logic_1164.all;
use IEEE.std_logic_unsigned.all;
entity CWLEGALITY is
port ( CWVAL : in
std_logic_vector(11 downto 0);
CMDOKAY : out std_logic
);
end CWLEGALITY;
architecture RTL of CWLEGALITY is
signal BROADCAST : std_logic;
signal ISMCODE : std_logic;
signal TX : std_logic;
signal SA : std_logic_vector(4 downto 0);
signal WCMC : std_logic_vector(4 downto 0);
begin
-- Decode incoming value
BROADCAST <= CWVAL(11);
TX <= CWVAL(10);
SA <= CWVAL(9 downto 5);
WCMC <= CWVAL(4 downto 0);
ISMCODE <= '1' when ( SA="00000" or SA="11111") else '0';
-- This process decodes the command word and sets CMDOKAY for legal command words.
PLEGAL:
process (BROADCAST,TX,SA,WCMC,ISMCODE)
variable OK : std_logic;
variable MUXSEL : std_logic_vector(5 downto 0);
begin
if (ISMCODE='0') then
-- Data transfers
MUXSEL := TX & SA;
OK := '0';
-- Default is disabled
------------------------------------------------------------------------
-- This case statement legalizes data transfers to certain subaddresses
case MUXSEL is
when "111010" => OK := '0';
when "111011" => OK := '0';
when "011001" => OK := '0';
Revision 3
-- SA 26 Disabled for TX
-- SA 27 Disabled for TX
-- SA 25 Disabled for RX
54
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