fpga: Implement functional Ethernet controller

fpga/constraints.pcf

@@ -38,8 +38,8 @@ set_io eth_tx_p[1] 2
 set_io eth_tx_p[2] 4
 set_io eth_tx_p[3] 3
 
-set_io eth_led_green 40
+set_io eth_led_green_n 40
-set_io eth_led_orange 41
+set_io eth_led_orange_n 41
 
 set_io led_user 34
 

fpga/hdl/design/top.vhd

@@ -25,35 +25,35 @@ entity top is
 		UART_BAUD : integer := 19200
 	);
 	port(
-		clk_50m        : in    std_logic; -- System clock
+		clk_50m          : in    std_logic; -- System clock
 
 		-- UART
-		uart_tx        : out   std_logic; -- UART TX
+		uart_tx          : out   std_logic; -- UART TX
-		uart_rx        : in    std_logic; -- UART RX
+		uart_rx          : in    std_logic; -- UART RX
 
 		-- Trashernet
-		eth_rx_p       : in    std_logic; -- Ethernet RX+
+		eth_rx_p         : in    std_logic; -- Ethernet RX+
 		--eth_rx_n       : in    std_logic; -- Ethernet RX-
-		eth_tx_p       : out   std_logic_vector(3 downto 0); -- Ethernet TX+
+		eth_tx_p         : out   std_logic_vector(3 downto 0); -- Ethernet TX+
-		eth_tx_n       : out   std_logic_vector(3 downto 0); -- Ethernet TX-
+		eth_tx_n         : out   std_logic_vector(3 downto 0); -- Ethernet TX-
 
 		-- LEDs
-		eth_led_green  : out   std_logic;
+		eth_led_green_n  : out   std_logic;
-		eth_led_orange : out   std_logic;
+		eth_led_orange_n : out   std_logic;
-		led_user       : out   std_logic; --
+		led_user         : out   std_logic; --
 
 		-- PSRAM IF
-		psram_ce_n     : out   std_logic;
+		psram_ce_n       : out   std_logic;
-		psram_sclk     : out   std_logic;
+		psram_sclk       : out   std_logic;
-		psram_sio      : inout std_logic_vector(3 downto 0); --
+		psram_sio        : inout std_logic_vector(3 downto 0); --
 
 		-- Config Flash
-		flash_ce_n     : out   std_logic;
+		flash_ce_n       : out   std_logic;
-		flash_sclk     : out   std_logic;
+		flash_sclk       : out   std_logic;
-		flash_sio      : inout std_logic_vector(3 downto 0); --
+		flash_sio        : inout std_logic_vector(3 downto 0); --
 
 		-- PMOD
-		pmod           : inout std_logic_vector(7 downto 0)
+		pmod             : inout std_logic_vector(7 downto 0)
 	);
 end entity top;
 
@@ -69,6 +69,9 @@ architecture rtl of top is
 	signal eth_tx_n_i : std_logic;
 	signal eth_rx_p_i : std_logic;
 
+	signal eth_led_green  : std_logic;
+	signal eth_led_orange : std_logic;
+
 	-- System Timer
 	signal irq_timer : std_logic;
 
@@ -247,7 +250,9 @@ begin
 			wb_i    => wb_eth_i,
 			rx_p    => eth_rx_p_i,
 			tx_p    => eth_tx_p_i,
-			tx_n    => eth_tx_n_i
+			tx_n    => eth_tx_n_i,
+			led_rx  => eth_led_green,
+			led_tx  => eth_led_orange
 		);
 	eth_tx_p <= (others => eth_tx_p_i);
 	eth_tx_n <= (others => eth_tx_n_i);
@@ -264,9 +269,9 @@ begin
 			mask      => wishbone_masks
 		);
 
-	eth_led_green  <= uart_tx;
+	eth_led_green_n  <= not eth_led_green;
-	eth_led_orange <= uart_rx;
+	eth_led_orange_n <= not eth_led_orange;
-	led_user       <= not psram_ce_n;
+	led_user         <= not uart_tx or not uart_rx;
 
 	flash_ce_n <= 'Z';
 	flash_sclk <= 'Z';

fpga/hdl/design/trashernet_phy_wb.vhd

@@ -37,7 +37,10 @@ entity trashernet_phy_wb is
 		-- Ethernet physical signals
 		rx_p    : in  std_logic;
 		tx_p    : out std_logic;
-		tx_n    : out std_logic
+		tx_n    : out std_logic;
+		-- LEDs
+		led_tx  : out std_logic;
+		led_rx  : out std_logic
 	);
 end entity trashernet_phy_wb;
 
@@ -46,6 +49,9 @@ architecture RTL of trashernet_phy_wb is
 	signal phy_out : phy_out_t;         -- PHY application IF (out)
 	signal phy_in  : phy_in_t;          -- PHY application IF (in)
 
+	signal mac_out : raw_mac_out_t;     -- MAC application IF (out)
+	signal mac_in  : raw_mac_in_t;      -- MAC application IF (in)
+
 	signal wb_adr : unsigned(2 downto 2);
 
 	signal status_register : std_logic_vector(31 downto 0);
@@ -57,6 +63,11 @@ architecture RTL of trashernet_phy_wb is
 	signal tx_fifo_commit : std_logic;
 	signal tx_fifo_empty  : std_logic;
 	signal tx_fifo_data   : std_logic_vector(7 downto 0);
+
+	signal rx_fifo_empty       : std_logic;
+	signal rx_bitcount         : std_logic_vector(10 downto 0);
+	signal rx_fifo_block_count : std_logic_vector(rx_bitcount'range);
+	signal rx_block_next       : std_logic;
 begin
 	trashernet_phy_inst : entity trashernet.trashernet_phy_cdc
 		generic map(
@@ -74,6 +85,16 @@ begin
 			tx_n    => tx_n
 		);
 
+	trashernet_raw_mac_inst : entity trashernet.trashernet_raw_mac
+		port map(
+			clk     => clk,
+			rst     => rst,
+			phy_out => phy_out,
+			phy_in  => phy_in,
+			mac_out => mac_out,
+			mac_in  => mac_in
+		);
+
 	rx_fifo_inst : entity generics.fifo_block
 		generic map(
 			SIZE => 2047
@@ -82,18 +103,48 @@ begin
 			clk        => clk,
 			rst_a      => '0',
 			clr        => rst,
-			data_in    => phy_out.rx_data,
+			data_in    => mac_out.rx_mac_data,
-			write      => phy_out.rx_data_valid,
+			write      => mac_out.rx_mac_valid,
-			commit     => not phy_out.rx_active,
+			commit     => mac_out.rx_mac_crc_ok,
-			abort      => '0',
+			abort      => mac_out.rx_mac_crc_error,
 			full       => open,
 			data_out   => rx_fifo_data,
 			data_first => open,
-			empty      => open,
+			empty      => rx_fifo_empty,
 			read       => rx_fifo_read,
 			usage      => open
 		);
 
+	fifo_inst : entity generics.fifo
+		generic map(
+			SIZE => 31
+		)
+		port map(
+			clk      => clk,
+			rst_a    => '0',
+			clr      => rst,
+			data_in  => rx_bitcount,
+			write    => mac_out.rx_mac_crc_ok,
+			full     => open,
+			data_out => rx_fifo_block_count,
+			empty    => open,
+			read     => rx_block_next,
+			usage    => open
+		);
+
+	rxcount : process(rst, clk) is
+	begin
+		if rst then
+			rx_bitcount <= (others => '0');
+
+		elsif rising_edge(clk) then
+			if mac_out.rx_mac_crc_error or mac_out.rx_mac_crc_ok then
+				rx_bitcount <= (others => '0');
+			elsif mac_out.rx_mac_valid then
+				rx_bitcount <= std_logic_vector(unsigned(rx_bitcount) + 1);
+			end if;
+		end if;
+	end process rxcount;
 	tx_fifo_inst : entity generics.fifo_block
 		generic map(
 			SIZE => 2047
@@ -110,7 +161,7 @@ begin
 			data_out   => tx_fifo_data,
 			data_first => open,
 			empty      => tx_fifo_empty,
-			read       => phy_out.tx_data_ack,
+			read       => mac_out.tx_mac_data_ack,
 			usage      => open
 		);
 
@@ -122,12 +173,14 @@ begin
 			rx_fifo_read   <= '0';
 			tx_fifo_write  <= '0';
 			tx_fifo_commit <= '0';
+			rx_block_next  <= '0';
 
 		elsif rising_edge(clk) then
 			wb_o.ack       <= '0';
 			rx_fifo_read   <= '0';
 			tx_fifo_write  <= '0';
 			tx_fifo_commit <= '0';
+			rx_block_next  <= '0';
 
 			if (wb_i.cyc and wb_i.stb) then
 				wb_o.ack <= '1';
@@ -136,7 +189,8 @@ begin
 					wb_o.dat <= status_register;
 					if wb_o.ack = '0' then
 						if wb_i.we = '1' then
-							tx_fifo_commit <= '1';
+							tx_fifo_commit <= wb_i.dat(2);
+							rx_block_next  <= wb_i.dat(1);
 						end if;
 					end if;
 				else
@@ -159,8 +213,43 @@ begin
 	wb_o.rty   <= '1';
 	wb_o.stall <= '0';
 
-	phy_in.tx_data_en <= not tx_fifo_empty; -- FIXME: this does not care about inter-packet gaps indicated by `data_first`
+	mac_in.tx_mac_data_en <= not tx_fifo_empty; -- FIXME: this does not care about inter-packet gaps indicated by `data_first`
-	phy_in.tx_data    <= tx_fifo_data;
+	mac_in.tx_mac_data    <= tx_fifo_data;
 
-	status_register <= (x"0000" & x"000" & "000" & phy_out.carrier_detect);
+	status_register <= ("0" & x"0" & rx_fifo_block_count & -- 31..16
+	                    x"000" & "0" & (not tx_fifo_empty) & (not rx_fifo_empty) & phy_out.carrier_detect);
+
+	ledstretch : process(clk) is
+		constant CMAX : integer := integer(0.2 / (1.0 / real(F_CLK)));
+		variable cnt  : integer range 0 to CMAX;
+	begin
+		if rising_edge(clk) then
+			if cnt = 0 then
+				led_rx <= phy_out.carrier_detect;
+				if phy_out.rx_active then
+					cnt := CMAX;
+				end if;
+			else
+				led_rx <= '0';
+				cnt    := cnt - 1;
+			end if;
+		end if;
+	end process ledstretch;
+
+	ledstretch2 : process(clk) is
+		constant CMAX : integer := integer(0.2 / (1.0 / real(F_CLK)));
+		variable cnt  : integer range 0 to CMAX;
+	begin
+		if rising_edge(clk) then
+			if cnt = 0 then
+				led_tx <= '0';
+				if phy_out.tx_active then
+					cnt := CMAX;
+				end if;
+			else
+				led_tx <= '1';
+				cnt    := cnt - 1;
+			end if;
+		end if;
+	end process ledstretch2;
 end architecture RTL;

fpga/hdl/trashernet

@@ -1 +1 @@
-Subproject commit 21a0d0e69aeacf9747bfac0262e0d7ca30a691d9
+Subproject commit 206332f3d1c1f5b704bad09b1380a8aed8b736aa