neyee
Newbie level 3
I design a ddr1 io in our chip, when I read data from memery with parallel terminations resistor the result is OK, the trace on pcb is about 6 inch(15cm),but
when I take off the parallel terminations resistance and only left the series resistor, I find I can't read right data from the memory chip, I think it is because of reflection, I want to know if I put the memory chip closer to our chip and only with series resistor, Can the ddr io work succesfully? How can simulation this?
thanks very much for your answer!!!
when I take off the parallel terminations resistance and only left the series resistor, I find I can't read right data from the memory chip, I think it is because of reflection, I want to know if I put the memory chip closer to our chip and only with series resistor, Can the ddr io work succesfully? How can simulation this?
thanks very much for your answer!!!