amba.vhd

AMBA总线AHB TO AHB bridge

library IEEE;
use IEEE.Std_Logic_1164.all;

package AMBA is
   -----------------------------------------------------------------------------
   -- Definitions for AMBA(TM) AHB Masters
   -----------------------------------------------------------------------------
   -- AHB master inputs (HCLK and HRESETn routed separately)
   type AHB_Mst_In_Type is
      record
         HGRANT:     Std_ULogic;                         -- bus grant
         HREADY:     Std_ULogic;                         -- transfer done
         HRESP:      Std_Logic_Vector(1       downto 0); -- response type
         HRDATA:     Std_Logic_Vector(31 downto 0); -- read data bus
         HCACHE:     Std_ULogic;                         -- cacheable data
      end record;

   -- AHB master outputs
   type AHB_Mst_Out_Type is
      record
         HBUSREQ:    Std_ULogic;                         -- bus request
         HLOCK:      Std_ULogic;                         -- lock request
         HTRANS:     Std_Logic_Vector(1       downto 0); -- transfer type
         HADDR:      Std_Logic_Vector(31 downto 0); -- address bus (byte)
         HWRITE:     Std_ULogic;                         -- read/write
         HSIZE:      Std_Logic_Vector(2       downto 0); -- transfer size
         HBURST:     Std_Logic_Vector(2       downto 0); -- burst type
         HPROT:      Std_Logic_Vector(3       downto 0); -- protection control
         HWDATA:     Std_Logic_Vector(31 downto 0); -- write data bus
      end record;

   -----------------------------------------------------------------------------
   -- Definitions for AMBA(TM) AHB Slaves
   -----------------------------------------------------------------------------
   -- AHB slave inputs (HCLK and HRESETn routed separately)
   type AHB_Slv_In_Type is
      record
         HSEL:       Std_ULogic;                         -- slave select
         HADDR:      Std_Logic_Vector(31 downto 0); -- address bus (byte)
         HWRITE:     Std_ULogic;                         -- read/write
         HTRANS:     Std_Logic_Vector(1       downto 0); -- transfer type
         HSIZE:      Std_Logic_Vector(2       downto 0); -- transfer size
         HBURST:     Std_Logic_Vector(2       downto 0); -- burst type
         HWDATA:     Std_Logic_Vector(31 downto 0); -- write data bus
         HPROT:      Std_Logic_Vector(3       downto 0); -- protection control
         HREADY:     Std_ULogic;                         -- transfer done
         HMASTER:    Std_Logic_Vector(3       downto 0); -- current master
         HMASTLOCK:  Std_ULogic;                         -- locked access
      end record;

   -- AHB slave outputs
   type AHB_Slv_Out_Type is
      record
         HREADY:     Std_ULogic;                         -- transfer done
         HRESP:      Std_Logic_Vector(1       downto 0); -- response type
         HRDATA:     Std_Logic_Vector(31 downto 0); -- read data bus
         HSPLIT:     Std_Logic_Vector(15      downto 0); -- split completion
      end record;

   -----------------------------------------------------------------------------
   -- Definitions for AMBA(TM) AHB Arbiter/Decoder
   -----------------------------------------------------------------------------
   -- supporting array types
   type AHB_Mst_In_Vector  is array (Natural Range <> ) of AHB_Mst_In_Type;
   type AHB_Mst_Out_Vector is array (Natural Range <> ) of AHB_Mst_Out_Type;
   type AHB_Slv_In_Vector  is array (Natural Range <> ) of AHB_Slv_In_Type;
   type AHB_Slv_Out_Vector is array (Natural Range <> ) of AHB_Slv_Out_Type;

end AMBA;