diff --git a/arty_a7_35.xdc b/arty_a7_35.xdc
index d4106fb..5bfa126 100644
--- a/arty_a7_35.xdc
+++ b/arty_a7_35.xdc
@@ -222,4 +222,7 @@ set_property IOSTANDARD LVCMOS33 [get_ports {ck_dig_h[13]}]
 set_property IOSTANDARD LVCMOS33 [get_ports {ck_dig_h[14]}]
 set_property IOSTANDARD LVCMOS33 [get_ports {ck_dig_h[15]}]
 
-create_clock -name clk_100mhz -period 10.000 [get_nets clock_100mhz]
+create_clock -period 12.5 [get_nets clk_sys]
+
+create_clock -period 40.0 [get_nets liteeth_inst.eth_rx_clk]
+create_clock -period 40.0 [get_nets liteeth_inst.eth_tx_clk]
diff --git a/gen_liteeth.py b/gen_liteeth.py
index c66e617..93fa24f 100755
--- a/gen_liteeth.py
+++ b/gen_liteeth.py
@@ -32,7 +32,7 @@ from liteeth.core import LiteEthUDPIPCore
 # IOs ----------------------------------------------------------------------------------------------
 
 MAC_ADDRESS = 0x00183e02a914
-CLK_FREQ = int(100e6)
+CLK_FREQ = int(80e6)
 
 _io = [
     # Clk / Rst
diff --git a/vhdl/arty_a7.vhdl b/vhdl/arty_a7.vhdl
index 93006d3..3829ccd 100644
--- a/vhdl/arty_a7.vhdl
+++ b/vhdl/arty_a7.vhdl
@@ -48,33 +48,180 @@ end arty_a7;
 architecture a of arty_a7 is
 	constant NUM_DRIVERS: positive := 16;
 	signal drivers: std_logic_vector(NUM_DRIVERS-1 downto 0);
+
+	component liteeth_core is
+		port (
+			sys_clock : in std_logic;
+			sys_reset : in std_logic;
+			mii_eth_clocks_tx : in std_logic;
+			mii_eth_clocks_rx : in std_logic;
+			mii_eth_rst_n : out std_logic;
+			mii_eth_mdio : inout std_logic;
+			mii_eth_mdc : out std_logic;
+			mii_eth_rx_dv : in std_logic;
+			mii_eth_rx_er : in std_logic;
+			mii_eth_rx_data : in std_logic_vector(3 downto 0);
+			mii_eth_tx_en : out std_logic;
+			mii_eth_tx_data : out std_logic_vector(3 downto 0);
+			mii_eth_col : in std_logic;
+			mii_eth_crs : in std_logic;
+			ip_address : in std_logic_vector(31 downto 0);
+			dhcp_ip_address : in std_logic_vector(31 downto 0);
+			dhcp_sink_valid : in std_logic;
+			dhcp_sink_last : in std_logic;
+			dhcp_sink_ready : out std_logic;
+			dhcp_sink_data : in std_logic_vector(31 downto 0);
+			dhcp_source_valid : out std_logic;
+			dhcp_source_last : out std_logic;
+			dhcp_source_ready : in std_logic;
+			dhcp_source_data : out std_logic_vector(31 downto 0)
+		);
+	end component;
+
+	signal dhcp_source_valid : std_logic;
+
+	component PLLE2_BASE
+		generic (
+			CLKFBOUT_MULT : integer;
+			DIVCLK_DIVIDE : integer;
+
+			CLKIN1_PERIOD : real;
+
+			CLKOUT0_DIVIDE     : integer := 0;
+			CLKOUT0_DUTY_CYCLE : real := 0.5;
+			CLKOUT0_PHASE      : real := 0.0;
+
+			CLKOUT1_DIVIDE     : integer := 0;
+			CLKOUT1_DUTY_CYCLE : real := 0.5;
+			CLKOUT1_PHASE      : real := 0.0;
+
+			CLKOUT2_DIVIDE     : integer := 0;
+			CLKOUT2_DUTY_CYCLE : real := 0.5;
+			CLKOUT2_PHASE      : real := 0.0;
+
+			CLKOUT3_DIVIDE     : integer := 0;
+			CLKOUT3_DUTY_CYCLE : real := 0.5;
+			CLKOUT3_PHASE      : real := 0.0;
+
+			CLKOUT4_DIVIDE     : integer := 0;
+			CLKOUT4_DUTY_CYCLE : real := 0.5;
+			CLKOUT4_PHASE      : real := 0.0;
+
+			CLKOUT5_DIVIDE     : integer := 0;
+			CLKOUT5_DUTY_CYCLE : real := 0.5;
+			CLKOUT5_PHASE      : real := 0.0
+		);
+		port (
+			RST    : in std_logic;
+			PWRDWN : in std_logic;
+			LOCKED : out std_logic;
+
+			CLKIN1 : in std_logic;
+
+			CLKFBIN  : in std_logic;
+			CLKFBOUT : out std_logic;
+
+			CLKOUT0 : out std_logic;
+			CLKOUT1 : out std_logic;
+			CLKOUT2 : out std_logic;
+			CLKOUT3 : out std_logic;
+			CLKOUT4 : out std_logic;
+			CLKOUT5 : out std_logic
+		);
+	end component PLLE2_BASE;
+
+	signal pll_feedback : std_logic;
+	signal unbuf_clk_sys : std_logic;
+	signal clk_sys : std_logic;
+
+	component BUFG
+		port (
+			I : in std_logic;
+			O : out std_logic
+		);
+	end component BUFG;
 begin
 	--leds_simple <= (others => '0');
-	led0 <= (others => '0');
+	--led0 <= (others => '0');
 	led1 <= (others => '0');
 	led2 <= (others => '0');
 	led3 <= (others => '0');
 
 	uart_tx <= '0';
 
-	mii_clk_25mhz <= '0';
-	mii_n_reset <= '0';
-	mii_mdio <= 'Z';
-	mii_mdc <= '0';
-	mii_tx_en <= '0';
-	mii_tx_data <= (others => '0');
-
 	ck_dig_l <= (others => 'Z');
 	ck_dig_h <= (others => 'Z');
 
 	leds_simple <= drivers(3 downto 0);
 
+	liteeth_inst: liteeth_core port map (
+		sys_clock => clk_sys,
+		sys_reset => '0',
+		mii_eth_clocks_tx => mii_tx_clk,
+		mii_eth_clocks_rx => mii_rx_clk,
+		mii_eth_rst_n => mii_n_reset,
+		mii_eth_mdio => mii_mdio,
+		mii_eth_mdc => mii_mdc,
+		mii_eth_rx_dv => mii_rx_dv,
+		mii_eth_rx_er => mii_rx_er,
+		mii_eth_rx_data => mii_rx_data,
+		mii_eth_tx_en => mii_tx_en,
+		mii_eth_tx_data => mii_tx_data,
+		mii_eth_col => mii_col,
+		mii_eth_crs => mii_crs,
+
+		ip_address => x"0a141e28", -- 10.20.30.40
+
+		dhcp_ip_address => x"0a141e29", -- 10.20.30.41
+		dhcp_sink_valid => '0',
+		dhcp_sink_last => '1',
+		dhcp_sink_data => x"cafebebe",
+
+		dhcp_source_valid => dhcp_source_valid,
+		dhcp_source_ready => '1'
+	);
+
+	-- 800 MHz VCO
+	-- 80 MHz system clock
+	-- 25 MHz MII clock
+	pll_inst: PLLE2_BASE
+		generic map (
+			CLKFBOUT_MULT => 8,
+			DIVCLK_DIVIDE => 1,
+
+			CLKIN1_PERIOD => 10.0,
+
+			CLKOUT0_DIVIDE => 10,
+			CLKOUT1_DIVIDE => 32,
+			CLKOUT2_DIVIDE => 10,
+			CLKOUT3_DIVIDE => 10,
+			CLKOUT4_DIVIDE => 10,
+			CLKOUT5_DIVIDE => 10
+		)
+		port map (
+			RST    => '0',
+			PWRDWN => '0',
+			CLKIN1 => clock_100mhz,
+
+			CLKFBIN  => pll_feedback,
+			CLKFBOUT => pll_feedback,
+
+			CLKOUT0 => unbuf_clk_sys,
+			CLKOUT1 => mii_clk_25mhz
+		);
+
+	bufg_clk_sys: BUFG
+		port map (
+			I => unbuf_clk_sys,
+			O => clk_sys
+		);
+
 	splink: entity work.splink
 		generic map (
 			NUM_DRIVERS => NUM_DRIVERS
 		)
 		port map (
-			clk => clock_100mhz,
+			clk => clk_sys,
 			reset => not n_reset,
 
 			drivers => drivers