Issues on clockless UART

Discussion in 'VHDL' started by Shashi, Apr 21, 2004.

  1. Shashi

    Shashi Guest

    Hi,
    I'm doing a project in clockless uart..as u know that the primary
    function of uart is parallel to serial conversion while transmitting
    and serial to paralel conversion while receiving..I was wondering if
    someone could tell me as how can i do a parallel to serial conversion
    and vice versa without using a clock.

    Thank You
    SHASHI
     
    Shashi, Apr 21, 2004
    #1
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  2. Shashi wrote:

    > Hi,
    > I'm doing a project in clockless uart..as u know that the primary
    > function of uart is parallel to serial conversion while transmitting
    > and serial to paralel conversion while receiving..I was wondering if
    > someone could tell me as how can i do a parallel to serial conversion
    > and vice versa without using a clock.


    You can't.
    --
    Tim Hubberstey, P.Eng. . . . . . Hardware/Software Consulting Engineer
    Marmot Engineering . . . . . . . VHDL, ASICs, FPGAs, embedded systems
    Vancouver, BC, Canada . . . . . . . . . . . http://www.marmot-eng.com
     
    Tim Hubberstey, Apr 21, 2004
    #2
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  3. Shashi

    fabbl Guest

    Are you using an AMI scheme with an embedded clock?

    "Shashi" <> wrote in message
    news:...
    > Hi,
    > I'm doing a project in clockless uart..as u know that the primary
    > function of uart is parallel to serial conversion while transmitting
    > and serial to paralel conversion while receiving..I was wondering if
    > someone could tell me as how can i do a parallel to serial conversion
    > and vice versa without using a clock.
    >
    > Thank You
    > SHASHI
     
    fabbl, Apr 22, 2004
    #3
  4. Shashi

    Ed Guest

    "Shashi" <> wrote in message
    news:...
    > Hi,
    > I'm doing a project in clockless uart..as u know that the primary
    > function of uart is parallel to serial conversion while transmitting
    > and serial to paralel conversion while receiving..I was wondering if
    > someone could tell me as how can i do a parallel to serial conversion
    > and vice versa without using a clock.
    >
    > Thank You
    > SHASHI


    Normally with a UART the signal your receiving (RS232 etc) doesn't have a
    clock. But the UART has a clock, which it uses to sample the serial input.
    Without some sort of clock you couldn't sample the input signal.
     
    Ed, Apr 22, 2004
    #4
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