Hello, I want to receive a seriell datastream at 20 x 142MHz = 2,84Gb/s with a Rocket I/O cell. Do I need to connect the external BREFCLK (142MHz) to RECEIVE data with a Rocket I/O cell or can I use the recovered clock RXRECCLK in the design? Thank you for answers, Matthias
Matthias,
If you want to have your received data aligned with the right clock, you use the received recovered clock (RXRECCLK).
If the transmit clock source is the same as the receive clock source (say the 142 MHz is distributed to all cards on a backplane) then you can use the FIFO in the receiver to align the phase to the master clock source (RXRECCLK clock into FIFO, master OSC clock out of FIFO).
If different transmit clock frequency is used, then the FIFO will overflow or underflow, and you should not be using the master clock for receive timing (as it is different from he transmit).
Aust> Hello,
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