Mar 12, 2012 #1 T tariq786 Advanced Member level 2 Joined Feb 24, 2004 Messages 562 Helped 67 Reputation 134 Reaction score 53 Trophy points 1,308 Location USA Activity points 3,048 i am simulating an opencores.com design and i see for certain clock cycles, some registers or flipflops have high impedance or z value. I am wondering is it normal for registers or flip-flops to have z value? Under what circumstance can a register or flip-flop get z value? Note that the clock is working fine.
i am simulating an opencores.com design and i see for certain clock cycles, some registers or flipflops have high impedance or z value. I am wondering is it normal for registers or flip-flops to have z value? Under what circumstance can a register or flip-flop get z value? Note that the clock is working fine.
Mar 13, 2012 #2 I iwpia50s Full Member level 4 Joined Oct 31, 2007 Messages 222 Helped 27 Reputation 54 Reaction score 10 Trophy points 1,298 Activity points 2,305 I suppose one could design anything, but it practice, a register is almost never a "Z". Even in power switching designs you would use retention.
I suppose one could design anything, but it practice, a register is almost never a "Z". Even in power switching designs you would use retention.