fpga/axi3-interconnect
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finished types. wrote top-entity

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This commit is contained in:
Mario Hüttel 2016-08-21 14:30:27 +02:00
parent 772ccc0da8
commit 6aaf75421a
2 changed files with 136 additions and 15 deletions
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22
src/axi3-interconnect.vhd
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@ -1,19 +1,29 @@
library ieee;
use ieee.std_logic_1164.all;
use ieee.numeric_std.all;
-- "work" denotes the curent library. Similar to this in C++, C# etc...
use work.axi3intercon_pkg.all;
entity axi3intercon is
port (
aclk : in std_logic;
aresetn : in std_logic
generic(
constant MASTER_COUNT : natural := 1;
constant SLAVE_COUNT : natural := 1
);
port(
aclk : in std_logic;
aresetn : in std_logic;
masters_in : out axi_masters_in(0 to MASTER_COUNT - 1);
masters_out : in axi_masters_out(0 to MASTER_COUNT - 1);
slaves_in : out axi_masters_in(0 to SLAVE_COUNT - 1);
slaves_out : in axi_masters_out(0 to SLAVE_COUNT - 1)
);
end entity axi3intercon;
architecture RTL of axi3intercon is
signal rst : std_logic;
begin
reset_sync : process(aclk, aresetn) is
reset_sync : process(aclk, aresetn) is
begin
if aresetn = '0' then
rst <= '1';
@ -21,7 +31,5 @@ begin
rst <= '0';
end if;
end process reset_sync;
end architecture RTL;

129
src/axi3-interconnect_pkg.vhd
View File

@ -3,17 +3,42 @@ use ieee.std_logic_1164.all;
use ieee.numeric_std.all;
package axi3intercon_pkg is
constant RID_MASTER_BITS : natural := 8;
constant RID_SLAVE_BITS : natural := 10;
constant WID_MASTER_BITS : natural := 8;
constant WID_SLAVE_BITS : natural := 10;
-- Slave bits have to be more. SLAVE_BITS = MASTER_BITS + log_2(MASTER_COUNT)
-- Master ID is padded onto ID to identify the transfer internally in the crossbar
-- This is defined in AXI-3 and -4 Standard.
constant RID_MASTER_BITS : natural := 12;
constant RID_SLAVE_BITS : natural := 14;
constant WID_MASTER_BITS : natural := 12;
constant WID_SLAVE_BITS : natural := 14;
constant DATA_BITS : natural := 32;
constant DATA_STROBES : natural := (DATA_BITS / 8);
constant ADDRESS_BITS : natural := 32;
constant MASTER_COUNT : natural := 2;
constant SLAVE_COUNT : natural := 2;
constant USER_BITS : natural := 4;
-- Constant definitions for signals
--Definitions for burst size
constant AXI_SIZE_1 : std_logic_vector(2 downto 0) := (others => '0');
constant AXI_SIZE_2 : std_logic_vector(2 downto 0) := "001";
constant AXI_SIZE_4 : std_logic_vector(2 downto 0) := "010";
constant AXI_SIZE_8 : std_logic_vector(2 downto 0) := "011";
constant AXI_SIZE_16 : std_logic_vector(2 downto 0) := "100";
constant AXI_SIZE_32 : std_logic_vector(2 downto 0) := "101";
constant AXI_SIZE_64 : std_logic_vector(2 downto 0) := "110";
constant AXI_SIZE_128 : std_logic_vector(2 downto 0) := "111";
-- Definitions for response vector
constant AXI_RESP_OKAY : std_logic_vector(1 downto 0) := "00";
constant AXI_RESP_EXOKAY : std_logic_vector(1 downto 0) := "01";
constant AXI_RESP_SLVERR : std_logic_vector(1 downto 0) := "10";
constant AXI_RESP_DECERR : std_logic_vector(1 downto 0) := "11";
-- Definitions for lock locked transactions (only AXI 3 supports locked access mode)
constant AXI_LOCK_NORMAL : std_logic_vector(1 downto 0) := "00";
constant AXI_RESP_EXCLUSIVE : std_logic_vector(1 downto 0) := "01";
constant AXI_RESP_LOCKED : std_logic_vector(1 downto 0) := "10";
-- type declarations for AW channel
type master_aw_out is record
@ -83,7 +108,7 @@ package axi3intercon_pkg is
wdata : std_logic_vector(DATA_BITS - 1 downto 0);
wstrb : std_logic_vector(DATA_STROBES - 1 downto 0);
wlast : std_logic;
wuser : std_logic; -- user defined
wuser : std_logic_vector(USER_BITS - 1 downto 0); -- user defined
wvalid : std_logic;
end record master_w_out;
@ -92,7 +117,7 @@ package axi3intercon_pkg is
wdata : std_logic_vector(DATA_BITS - 1 downto 0);
wstrb : std_logic_vector(DATA_STROBES - 1 downto 0);
wlast : std_logic;
wuser : std_logic; -- user defined
wuser : std_logic_vector(USER_BITS - 1 downto 0); -- user defined
wvalid : std_logic;
end record slave_w_in;
@ -101,6 +126,94 @@ package axi3intercon_pkg is
end record master_w_in;
subtype slave_w_out is master_w_in;
-- Type declarations for R channel
type master_r_in is record
rid : std_logic_vector(RID_MASTER_BITS - 1 downto 0);
rdata : std_logic_vector(DATA_BITS - 1 downto 0);
rresp : std_logic_vector(1 downto 0);
rlast : std_logic;
ruser : std_logic_vector(USER_BITS - 1 downto 0);
rvalid : std_logic;
end record master_r_in;
type slave_r_out is record
rid : std_logic_vector(RID_SLAVE_BITS - 1 downto 0);
rdata : std_logic_vector(DATA_BITS - 1 downto 0);
rresp : std_logic_vector(1 downto 0);
rlast : std_logic;
ruser : std_logic_vector(USER_BITS - 1 downto 0);
rvalid : std_logic;
end record slave_r_out;
type master_r_out is record
rready : std_logic;
end record master_r_out;
subtype slave_r_in is master_r_out;
-- Type declarations for B channel
type master_b_in is record
bid : std_logic_vector(WID_MASTER_BITS - 1 downto 0);
bresp : std_logic_vector(1 downto 0);
buser : std_logic_vector(USER_BITS - 1 downto 0);
bvalid : std_logic;
end record master_b_in;
type slave_b_out is record
bid : std_logic_vector(WID_SLAVE_BITS - 1 downto 0);
bresp : std_logic_vector(1 downto 0);
buser : std_logic_vector(USER_BITS - 1 downto 0);
bvalid : std_logic;
end record slave_b_out;
type master_b_out is record
bready : std_logic;
end record master_b_out;
subtype slave_b_in is master_b_out;
-- Combined definitions
type axi_master_in is record
aw : master_aw_in;
ar : master_ar_in;
w : master_w_in;
r : master_r_in;
b : master_b_in;
end record axi_master_in;
type axi_master_out is record
aw : master_aw_out;
ar : master_ar_out;
w : master_w_out;
r : master_r_out;
b : master_b_out;
end record axi_master_out;
type axi_slave_in is record
aw : slave_aw_in;
ar : slave_ar_in;
w : slave_w_in;
r : slave_r_in;
b : slave_b_in;
end record axi_slave_in;
type axi_slave_out is record
aw : slave_aw_out;
ar : slave_ar_out;
w : slave_w_out;
r : slave_r_out;
b : slave_b_out;
end record axi_slave_out;
-- Array definitions
type axi_masters_in is array (natural range <>) of axi_master_in;
type axi_masters_out is array (natural range <>) of axi_master_out;
type axi_slaves_in is array (natural range <>) of axi_slave_in;
type axi_slaves_out is array (natural range <>) of axi_slave_out;
end package axi3intercon_pkg;
-- package body axi3intercon_pkg is