Issues on clockless UART

[Shashi]

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

 

[Tim Hubberstey]

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

 

[fabbl]

Are you using an AMI scheme with an embedded clock?

"Shashi" <shashi22k@rediffmail.com> wrote in message
news:7cdabebf.0404201536.3381acb7@posting.google.com...

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

 

[Ed]

"Shashi" <shashi22k@rediffmail.com> wrote in message
news:7cdabebf.0404201536.3381acb7@posting.google.com...

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.