ncsim 仿真无故停止

lccchc

在 ncsim仿真时，到某个时刻，进程就死掉进入 sleep状态，这是怎么回事？求大侠解惑

wythelin

進入Sleep? 是指 時間軸不跑了嗎?

一般狀況應該是有combination loop

lccchc

回复 2# wythelin

是的,还没跑完,进程就消失不见了,不再跑了.现在又出现这个问题了

lccchc

又出现这个问题了,有人碰到过这个情况吗,求解啊?会不会是软件问题,没破解好?

lccchc

回复 2# wythelin


combination loop  是什么意思,要怎么解决

547925053

看一下是不是有zero delay回路

lccchc

回复 6# 547925053


   谢谢你啊,能说具体点怎么检查吗?

547925053

我理解错了，应该是combinational loop，Combinational loops are among the most common causes of instability and unreliability in digital designs. They should be avoided whenever possible. In a synchronous design, feedback loops should include registers. Combinational loops generally violate synchronous design principles by establishing a direct feedback loop that contains no registers. For example, a combinational loop occurs when the left-hand side of an arithmetic expression also appears on the right-hand side in HDL code. A combinational loop also occurs when you feed back the output of a register to an asynchronous pin of the same register through combinational logic。

547925053

回复 7# lccchc

我理解错了，应该是combinational loop：
   Combinational loops are among the most common causes of instability and unreliability in digital designs. They should be avoided whenever possible. In a synchronous design, feedback loops should include registers. Combinational loops generally violate synchronous design principles by establishing a direct feedback loop that contains no registers. For example, a combinational loop occurs when the left-hand side of an arithmetic expression also appears on the right-hand side in HDL code. A combinational loop also occurs when you feed back the output of a register to an asynchronous pin of the same register through combinational logic,

547925053

Combinational loops are among the most common causes of instability and unreliability in digital designs. They should be avoided whenever possible. In a synchronous design, feedback loops should include registers. Combinational loops generally violate synchronous design principles by establishing a direct feedback loop that contains no registers. For example, a combinational loop occurs when the left-hand side of an arithmetic expression also appears on the right-hand side in HDL code. A combinational loop also occurs when you feed back the output of a register to an asynchronous pin of the same register through combinational logic。