My board DE2-115 My PHY Device:88E1111 My project is about simple socket server.Now I can send words or command via Telnet or Ping, when I use a router(100Mbps). But, when I directly connect the board and PC with a cross-over cable , I failed. Then when I fix my pc for 100Mbps and connect the board and PC with a cross-over cable, I succeed. So if I want to use 1000Mbps, what should I do ? I know I need to provide different clock to Marvell 88E1111 PHY Device for different speed. Such as 2.5MHz for 10mbps/ 25MHz for 100mbps /125MHz for 1000mbps. Who can tell me how to change the clock and where to change the clock,provided for phy device. It is the first time for me to post a thread, I hope that somebody could help me to solve this problem.

Use example projects and search for file mii_gmii_mux.vhd. Or You can write Your own clock mux.

--- Quote Start --- Use example projects and search for file mii_gmii_mux.vhd. Or You can write Your own clock mux. --- Quote End --- Dear Socrates, thanks for your reply. I find the file GMII_MII_MUX.v But I still don't know how to change these codes.They are as follows: ******************************************************** module GMII_MII_MUX ( //--- PHY Interface reset_rx_clk_n, phy_rx_clk, phy_rx_col, phy_rx_crs, phy_rx_d, phy_rx_dv, phy_rx_err, reset_tx_clk_n, tx_clk_ref125, // 125MHz TX local reference clock tx_clk_phy125, // 125MHz TX clock for GMII tx_clk_mac, // TX clock to use by the MAC tx_clk, // 25MHz/2.5MHz TX clock from PHY, phy_gtx_clk, // TX clock to PHY phy_tx_d, phy_tx_en, phy_tx_err, phy_mdio, //--- Local MII Interface m_rx_col, m_rx_crs, m_rx_d, m_rx_dv, m_rx_err, m_tx_d, m_tx_en, m_tx_err, //--- Local GMII Interface gm_rx_d, gm_rx_dv, gm_rx_err, gm_tx_d, gm_tx_en, gm_tx_err, //--- eth_mode, //--- Mode select, from MAC configuration, 1 : Gigabit, 0 : 10/100 ena_10, mdio_in, mdio_oen, mdio_out ); //========================================================= // PARAMETER declarations //========================================================= //========================================================= // PORT declarations //========================================================= //--- PHY Interface input reset_rx_clk_n; input phy_rx_clk; input phy_rx_col; input phy_rx_crs; input [7:0] phy_rx_d; input phy_rx_dv; input phy_rx_err; input reset_tx_clk_n; input tx_clk_ref125; input tx_clk_phy125; output tx_clk_mac; input tx_clk; output phy_gtx_clk; output [7:0] phy_tx_d; output phy_tx_en; output phy_tx_err; inout phy_mdio; //--- Local MII Interface output m_rx_col; output m_rx_crs; output [3:0] m_rx_d; output m_rx_dv; output m_rx_err; input [3:0] m_tx_d; input m_tx_en; input m_tx_err; //--- Local GMII Interface output [7:0] gm_rx_d; output gm_rx_dv; output gm_rx_err; input [7:0] gm_tx_d; input gm_tx_en; input gm_tx_err; //--- input eth_mode; input ena_10; output mdio_in; input mdio_oen; input mdio_out; //========================================================= // REG/WIRE declarations //========================================================= wire tx_clk_int; reg mode_reg1; reg mode_reg2; reg [7:0] gm_rx_d_r; reg gm_rx_dv_r; reg gm_rx_err_r; reg gtx_clk; //========================================================= // Structural coding //========================================================= // mdio tristate assign mdio_in = phy_mdio; assign phy_mdio = mdio_oen ? 1'bz : mdio_out; // PHY RX input always @(negedge reset_rx_clk_n or posedge phy_rx_clk) begin if (reset_rx_clk_n == 1'b0) begin gm_rx_d_r <= 8'b00000000; gm_rx_dv_r <= 1'b0; gm_rx_err_r <= 1'b0; end else begin gm_rx_d_r <= phy_rx_d; gm_rx_dv_r <= phy_rx_dv; gm_rx_err_r <= phy_rx_err; end end // MII RX local interface assign m_rx_col = phy_rx_col; assign m_rx_crs = phy_rx_crs; assign m_rx_d = gm_rx_d_r[3:0]; assign m_rx_dv = gm_rx_dv_r; assign m_rx_err = gm_rx_err_r; // MII RX local interface assign gm_rx_d = gm_rx_d_r[7:0]; assign gm_rx_dv = gm_rx_dv_r; assign gm_rx_err = gm_rx_err_r; // TX clock MUX always @(negedge reset_tx_clk_n or posedge tx_clk_ref125) begin if (reset_tx_clk_n == 1'b0) begin mode_reg1 <= 1'b0; mode_reg2 <= 1'b0; end else begin mode_reg1 <= eth_mode; mode_reg2 <= mode_reg1; end end assign tx_clk_int = mode_reg2 ? tx_clk_ref125 : tx_clk; assign tx_clk_mac = tx_clk_int; assign phy_tx_d = mode_reg2 ? gm_tx_d : {4'b0000,m_tx_d[3:0]}; assign phy_tx_en = mode_reg2 ? gm_tx_en : m_tx_en; assign phy_tx_err = mode_reg2 ? gm_tx_err : m_tx_err; // GXT_CLk driver ddr_o gen_gxt_clk ( .datain_h(1'b1), .datain_l(1'b0), .outclock(tx_clk_phy125), .dataout(phy_gtx_clk) ); endmodule ******************************************************** Can you tell me what should I do to get 125MHz for PHY Device and then enable the 1000Mbps? Have a good day,Socrates.

Just look at the top level file in the example project and do the same in yours.

generate 125MHz clock using PLL.

--- Quote Start --- generate 125MHz clock using PLL. --- Quote End --- Can I get 125MHz by changing GMII_MII_MUX.v?

How to provide different clock for PHY Device

27 Replies

Altera_Forum
Honored Contributor
14 years ago
The PHY provides that. Download and examine examples from Altera.
Altera_Forum
Honored Contributor
14 years ago
My project is just provided by Altera.
My SOPC is WEB_SERVER(rgmii) provided by CD of DE2-115.
MY software is simple_socket_server(RGMII)
I need to change something in SOPCBuilder or top level file? The datasheet of 88E1111 show me that the frequency, provided for PHY, is changed automatically.
When it is 1000Mbps, we get 125Mhz.
When it is 100Mbps, we get 25Mhz.
Altera_Forum
Honored Contributor
14 years ago
That's true, but afaik You need GMII, not RGMII?
Altera_Forum
Honored Contributor
14 years ago
Shoule I use the WebServer(GMII)?
I sorry that I do not understand what you mean.
Altera_Forum
Honored Contributor
14 years ago
Oh, just checked, that You use DE115. Then it's RGMII there.
Altera_Forum
Honored Contributor
14 years ago
Is there any possiblity that My pc does not support 1000Mbps?
Altera_Forum
Honored Contributor
14 years ago
It depends, check the motherboard or Your ethernet card specs.
Altera_Forum
Honored Contributor
14 years ago
When I conect my board and PC, the ENET0 LED1000 is bright. Does that mean my PC support 1000Mbps
Altera_Forum
Honored Contributor
14 years ago
I'd say yes, the board PHY recognize the 1Gbit link.
Altera_Forum
Honored Contributor
14 years ago
:cry::cry::cry:Then what can I do now to use 1000Mbps full duplex to transfer data?

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How to provide different clock for PHY Device

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