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Thread: power connections and clocks

  1. #1
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    Default power connections and clocks

    Hello.
    I am a fresh new to all FPGA world,my question is about from what i should start when i

    designing board for cyclone 4 ,how i need to connect power and clocks .

    Is thre a need to place clock for each bank or thre could be one clock in for all the device e.t.c.

    Thx.

  2. #2
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    Default Re: power connections and clocks

    I am a fresh new to all FPGA world,my question is about from what i should start when i

    designing board for cyclone 4 ,how i need to connect power and clocks .

    Is thre a need to place clock for each bank or thre could be one clock in for all the device e.t.c.
    You're starting in the wrong order.

    First you decide what function your design needs. Then you investigate which FPGA meets those design requirements, eg., does it have the right I/O (LVCMOS, LVDS, DDR, transceivers etc), and does it have sufficient logic density. You then place-and-route a design in the FPGA, and ensure that the tool (Quartus II) is happy with your I/O selection (voltages and pin assignments) and clocking scheme. You then run a power analysis to determine how much power your design requires, and then increase that limit to whatever you determine the worst-case would be.

    Then, you see if you can find an evaluation board with most of the features you need, and you test it.

    Then you start on your own board design. You look at the power supply designs on the reference board you own, and several other reference boards (since most provide schematics). Your clocking scheme is determined by what your design requires and what the place-and-route tools allows. Again, you look at a reference design for ideas, eg., should I use an oscillator, a programmable oscillator, an external SMA connector?

    Don't design a board until you know what you want

    Here's a list of Cyclone IV reference boards:

    1) Terasic DE0-nano

    http://www.terasic.com.tw/cgi-bin/pa...yNo=139&No=593

    2) Arrow BeMicro-SDK

    http://www.arrownac.com/solutions/bemicro-sdk/

    3) Cyclone IV GX Transceiver starter kit

    http://www.altera.com/products/devki...v-starter.html

    Cheers,
    Dave
    Last edited by dwh@ovro.caltech.edu; April 24th, 2012 at 10:42 AM.

  3. #3
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    Default Re: power connections and clocks

    Altera makes guidelines for each FPGA family, containing checklists and everything you should think about when designing a new FPGA board. The one for Cyclone IV is AN 592.

  4. #4
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    Default Re: power connections and clocks

    Thank you i did help me a lot

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