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Altera_Forum's avatar
Altera_Forum
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11 years ago

GXB Receiver issue

Hi, recently, I have an issue using Altera's GXB receivers. In my design, there are two GXB Receivers, named R0 and R1. Sometimes, the input of R1 is floating (means no GXB transmitter is connected to the input pin of rx_gxb of R1), because of which, rx_ctrldetect of R1 is undetermined, especially, its values can be 2'b00, which will result in invalid data being recognized as valid data. Is there a solution that can prevent from getting invalid data as valid data when the receiver input is floating? Thanks!

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  • Altera_Forum's avatar
    Altera_Forum
    Icon for Honored Contributor rankHonored Contributor
    10 years ago

    My general understanding is floating of Altera GXB receiver is not recommended. You could refer to the pin connection guideline of the specific device that you are using. If the receiver might have data connected at later time, you could try to hold the channel in reset mode. Alternatively, you could make use of the signal detect status signal to tell whenever valid data present.