Changes between Version 4 and Version 5 of HardwareUsersGuides/FPGABoard_v1.2/MGTs


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Timestamp:
Jul 9, 2007, 11:15:54 AM (17 years ago)
Author:
murphpo
Comment:

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  • HardwareUsersGuides/FPGABoard_v1.2/MGTs

    v4 v5  
    1616The MGTs require clocks driven into specific pins on the FPGA, refered to as BREFCLK and BREFCLK2. The left oscillator (component Y1) drives BREFCLK; the right oscillator (component Y3) drives BREFCLK2. The pin mapping for these clock signals are:
    1717
    18 || Clk Input || Schematic Name || FPGA Pin ||
     18|| '''Clk Input''' || '''Schematic Name'' || '''FPGA Pin''' ||
    1919|| BREFCLK+ || MGT_CLK0P || E20 ||
    2020|| BREFCLK- || MGT_CLK0N || D20 ||
    … …  
    2424[[BR]]
    2525
    26 || BREFCLK Oscillator || BREFCLK2 Oscillator ||
     26|| '''BREFCLK Oscillator''' || '''BREFCLK2 Oscillator''' ||
    2727|| [[Image(HardwareUsersGuides/FPGABoard_v1.2/Images:FPGA_Board_MGTCLK1.jpg)]] || [[Image(HardwareUsersGuides/FPGABoard_v1.2/Images:FPGA_Board_MGTCLK2.jpg)]] ||
    2828
    … …  
    3030
    3131=== VTRX Configuration ===
    32 Short bottom pins for 2.5v (required for WARP board-to-board links), top pins for 1.8v (for connections to AC-coupled transmitters).
     32The Rx termination voltage for the middle four of the FPGA board's MGTs can be configured for 1.8v or 2.5v. VTRX=2.5v is required for DC-coupled connections to other FPGA boards. VTRX=1.8v is used when connected to devices with AC-coupling, like some third-party FPGA boards.
     33
     34The other four MGTs are always configured for VTRX=2.5v.
     35
     36The configuraiton is handled by mounting a shunt across two pins on a three pin header for each MGT. The bottom pins are shorted for VTRX=2.5v; the top pins for VTRX=1.8.v
    3337
    3438[[Image(HardwareUsersGuides/FPGABoard_v1.2/Images:FPGA_Board_MGTVTRX.jpg)]]
    3539
     40=== Connectors & Cables ===
     41All eight MGTs are wired to Infiniband-keyed HSSDC2 jacks. You must use an Infiniband-keyed 100Ω HSDDC2-HSDDC2 cable to connect two FPGA boards together. One such cable is made by Molex ([http://www.molex.com/cgi-bin/bv/molex/jsp/products/datasheet.jsp?productid=35277 Molex HSDDC2 Cables]).
    3642
    37 
    38 === Cables ===
    39 [http://www.molex.com/cgi-bin/bv/molex/jsp/products/datasheet.jsp?productid=83666 Molex HSSDC2 Jack]
    40 [[BR]]
    41 [http://www.molex.com/cgi-bin/bv/molex/jsp/products/datasheet.jsp?productid=35277 Molex HSDDC2 Cables]
    42