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TS201 link port communication error!!!

Question asked by sunseal on Feb 9, 2012
Latest reply on Feb 9, 2012 by CraigG


  There are 4 DSPs (ADSP-TS201SABP-060) on the board ,they communicate with link port in 4 bit data mode and the baud rate is set up 480Mbps. We found that some of the link ports`s communication are error below  0°C. The correct data should be 0x12345678 0x12345679, but the receiver is always read 0x34567800 0x34567912 . We think that the Link Ports [3–0] Data and the the Link Ports Clock are not synchronous. the link port  receives clk  before data one clk cycle .

    We tried to add external 100ohm differential termination resistors and decreased the clock but it was always error .The PCB is according to Link Port LVDS PCB Guidelines .

    Our question is why it is correct in nomal temperature and high temperature(from 18°C to 55°C),but mistake below 0°C. And how can we deal with it?