wrote decerr slave, ready for testing the functionality of the crossbar

src/axi3-interconnect-decerr.vhd

@@ -3,19 +3,22 @@ use ieee.std_logic_1164.all;
 use ieee.numeric_std.all;
 use work.axi3intercon_pkg.all;
 
-entity filename is
+entity axi3decerr is
 	port(
 		clk       : in  std_logic;
 		rst       : in  std_logic;
 		slave_in  : in  axi_slave_in_t;
 		slave_out : out axi_slave_out_t
 	);
-end entity filename;
+end entity axi3decerr;
 
-architecture RTL of filename is
+architecture RTL of axi3decerr is
 	type r_state_t is (R_READY, R_ERROR);
+	type w_state_t is (W_READY, W_ERROR);
+	signal w_state : w_state_t;
 	signal r_state : r_state_t;
 	signal r_len   : unsigned(7 downto 0);
+
 begin
 	read_error : process(clk, rst) is
 	begin
@@ -61,4 +64,36 @@ begin
 		end if;
 	end process read_error;
 
+	-- AW Acceptor:
+	slave_out.aw.awready <= '1';        -- Always accept write transactions (interconnect will manage that only one is active)
+
+	write_error : process(clk, rst) is
+	begin
+		if rst = '1' then
+			slave_out.w.wready <= '0';
+			slave_out.b.bid    <= (others => '0');
+			slave_out.b.bresp  <= (others => '0');
+			slave_out.b.buser  <= (others => '0');
+			slave_out.b.bvalid <= '0';
+		elsif rising_edge(clk) then
+			case w_state is
+				when W_READY =>
+					if slave_in.w.wvalid = '1' then
+						slave_out.w.wready <= '1';
+						w_state            <= W_ERROR;
+						slave_out.b.bid    <= slave_in.w.wid;
+						slave_out.b.bresp  <= AXI_RESP_DECERR;
+						slave_out.b.bvalid <= '1';
+						r_len              <= unsigned(slave_in.ar.arlen);
+					end if;
+				when W_ERROR =>
+					slave_out.w.wready <= '0';
+					if slave_in.b.bready = '1' then
+						slave_out.b.bvalid <= '0';
+						w_state            <= W_READY;
+					end if;
+			end case;
+		end if;
+	end process write_error;
+
 end architecture RTL;

src/axi3-interconnect.vhd

@@ -47,6 +47,9 @@ architecture RTL of axi3intercon is
 	signal b_masters_in   : axi_b_masters_in_t(0 to MASTER_COUNT - 1);
 	signal b_masters_out  : axi_b_masters_out_t(0 to MASTER_COUNT - 1);
 
+	signal decerr_in  : axi_slave_in_t;
+	signal decerr_out : axi_slave_out_t;
+
 begin
 	reset_sync : process(aclk, aresetn) is
 	begin
@@ -165,4 +168,26 @@ begin
 		slaves_in(i).b  <= b_slaves_in(i);
 	end generate b_slave_connect;
 
+	-- ERROR slave connections
+
+	axi3decerr_inst : entity work.axi3decerr
+		port map(
+			clk       => aclk,
+			rst       => rst,
+			slave_in  => decerr_in,
+			slave_out => decerr_out
+		);
+
+	decerr_in.ar <= ar_slaves_in(SLAVE_COUNT);
+	decerr_in.aw <= aw_slaves_in(SLAVE_COUNT);
+	decerr_in.r  <= r_slaves_in(SLAVE_COUNT);
+	decerr_in.w  <= w_slaves_in(SLAVE_COUNT);
+	decerr_in.b  <= b_slaves_in(SLAVE_COUNT);
+
+	ar_slaves_out(SLAVE_COUNT) <= decerr_out.ar;
+	aw_slaves_out(SLAVE_COUNT) <= decerr_out.aw;
+	r_slaves_out(SLAVE_COUNT)  <= decerr_out.r;
+	w_slaves_out(SLAVE_COUNT)  <= decerr_out.w;
+	b_slaves_out(SLAVE_COUNT)  <= decerr_out.b;
+
 end architecture RTL;