Question on Transceiver's Input Referance Clock should be placed close to Transmit PLL? (UG01143 - Scetion3.2) - Question on Transceiver's Input Referance Clock should be placed close to Transmit PLL? (UG01143 - Scetion3.2) Hi there, we use A10 GX-057 device. There is a description on UG-01143 section 3.2, page 380-381, "For betst jitter performance, Intel recommends placing the (Transceiver's) input referance clock as close as possible to the transmit PLL" My question is, how to understand this requirement? Is it a requirement for Hardware Design (for the clock pins assignment) or for Logic Design (for the PLL clock placement when synthesizing and routing the verilog code inside FPGA)? I think it's should be the latter, but not sure. Thanks! Replies: Re: Question on Transceiver's Input Referance Clock should be placed close to Transmit PLL? (UG01143 - Scetion3.2) Got it, Thanks! Replies: Re: Question on Transceiver's Input Referance Clock should be placed close to Transmit PLL? (UG01143 - Scetion3.2) Hi, If you plan a design and it is auto route Quaruts will automatically place,If not make the constrain in Quartus qsf file. So in simple words it FPGA depend . Regards, Rs Replies: Re: Question on Transceiver's Input Referance Clock should be placed close to Transmit PLL? (UG01143 - Scetion3.2) up