Subversion Repositories epc_rfid_transponder

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--     Politecnico di Torino                                              

--     Dipartimento di Automatica e Informatica               

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--

--     Title          : EPC Class1 Gen2 RFID Tag constants   

--

--     File name      : epc_tag.vhd 

--

--     Description    : EPC tag package

--

--     Authors        : Erwing R. Sanchez <erwing.sanchezsanchez@polito.it>

--

--     Rev. History   : 21 july 06 - First Draft 

--                                 

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library IEEE;

use IEEE.STD_LOGIC_1164.all;

package EPC_TAG is

  constant MASKLENGTH : integer := 256;

  subtype Rec_Out_T is std_logic_vector(31 downto 0);

--  type CommandInternalCode_t is (cmd_NULL, cmd_QueryRep, cmd_Ack, cmd_Query, cmd_QueryAdjust,

--                                 cmd_Select, cmd_Nak, cmd_ReqRN, cmd_Read, cmd_Write, cmd_Kill,

--                                 cmd_Lock, cmd_Access, cmd_BlockWrite, cmd_BlockErase, cmd_Invalid);

  subtype CommandInternalCode_t is std_logic_vector(3 downto 0);

  constant cmd_NULL        : std_logic_vector(3 downto 0) := "0000";

  constant cmd_QueryRep    : std_logic_vector(3 downto 0) := "0001";

  constant cmd_Ack         : std_logic_vector(3 downto 0) := "0010";

  constant cmd_Query       : std_logic_vector(3 downto 0) := "0011";

  constant cmd_QueryAdjust : std_logic_vector(3 downto 0) := "0100";

  constant cmd_Select      : std_logic_vector(3 downto 0) := "0101";

  constant cmd_Nak         : std_logic_vector(3 downto 0) := "0110";

  constant cmd_ReqRN       : std_logic_vector(3 downto 0) := "0111";

  constant cmd_Read        : std_logic_vector(3 downto 0) := "1000";

  constant cmd_Write       : std_logic_vector(3 downto 0) := "1001";

  constant cmd_Kill        : std_logic_vector(3 downto 0) := "1010";

  constant cmd_Lock        : std_logic_vector(3 downto 0) := "1011";

  constant cmd_Access      : std_logic_vector(3 downto 0) := "1100";

  constant cmd_BlockWrite  : std_logic_vector(3 downto 0) := "1101";

  constant cmd_BlockErase  : std_logic_vector(3 downto 0) := "1110";

  constant cmd_Invalid     : std_logic_vector(3 downto 0) := "1111";

--  subtype CommandTransmitter_t is std_logic_vector(2 downto 0)

  constant trmcmd_Null         : std_logic_vector(2 downto 0) := "000";

  constant trmcmd_Send         : std_logic_vector(2 downto 0) := "001";

  constant trmcmd_SendError    : std_logic_vector(2 downto 0) := "010";

  constant trmcmd_SendRData    : std_logic_vector(2 downto 0) := "011";

  constant trmcmd_SendRHandler : std_logic_vector(2 downto 0) := "100";

end EPC_TAG;