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Last Post 10 May 2007 06:08 AM by  steve
LITEKIT rev-5 changes to sheet-7 (LCD)
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steve
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09 May 2007 01:03 PM
    I've been running through the LITEKIT rev-5 changes to check effects on our design at the same time nearly ready to start interfacing a different LCD panel (simlilar VGA-TFT). I see the new 22ohm R arrays on signals between the buffers and panel.

    Were these mainly for signal rolloff, improved EMI, etc., or was there another goal? I'll be using a standard 3.3v panel, so not sure of the need. For rolloff of hi-speed stuff, I would normally use a 10ohm.

    Thanks for any tips - Steve
    kurtl@logicpd.com
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    09 May 2007 03:28 PM
    Steve,
    The 22ohm resistors are to reduce EMI. The standard LPD display kits come with a 18" parralel ribbon cable so it is a pretty noisy setup. Ideally there would be an LVDS encoder on the baseboard and a decoder at the end of the 18" cable.

    -K
    steve
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    10 May 2007 06:08 AM
    Very good.

    Thanks Kurt.
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