I almost became autistic because I used the wrong AD xsignal function

Nubility

I almost became autistic because I used the wrong AD xsignal function [Copy link]

These days I need to use the xsignal function of AD to realize multiple equal-length segments of net class. As a result, when creating xsignal, the grouping of the created xsignal class is always wrong. I thought it was a bug in the software, and secretly cursed in my heart, what a rubbish software.

In fact, there is a detail that has been overlooked. When creating xsignal, there is an analyze section, which contains many topological structures. If you choose the wrong one, the wrong topological structure and xsignal members will be analyzed.

For example, if some signals have series resistors and some are directly connected, use the default Through 1 series component . First, add the xsignal with 3 series resistors to an xsignal class. Then create the xsignal member corresponding to the directly connected signal in the xsignal class. If there is no series resistor, you can select the first option by default. The same applies to other situations.

Then a set of completed xsignals is created. When the lengths are equal, the lengths at both ends of the resistor can be directly calculated into the total wiring length.

Finally, set the equal length rule:

I originally thought that I knew AD quite well, but I didn’t expect to fail this time and waste a day in vain.

秦天qintian0303

AD software has many practical functions, but if you don't use it often, many details will be overlooked.

qwqwqw2088

The xsignal function of this AD is really not often used.

Thank you for sharing

Nubility

qwqwqw2088 posted on 2023-7-12 09:07 This AD xsignal function is really not often used. Thank you for sharing

It is still very useful when there are multiple DDR chips and series resistance in the net class. It's just that I rarely encountered it before, or I solved it with other methods.

laker2008

MARK it first. I have hardly used this function. Let me learn it first~~~

feng289695601

I'll save it first. I haven't used it much. I'll learn from it. Thanks to the host for sharing.

Nubility

feng289695601 posted on 2023-7-12 13:47 I will save it first. I haven't used it much. I will learn from it. Thanks to the host for sharing.

Thank you for your support

zhaoyanhao

Before, I used Cadence to draw multiple DDR chips by setting the pin pairs and setting the length of nodes to be equal. Later, my new company needed to use AD, so I bought Fanyi's video course. I was a little scornful at first, but after I understood Xsignal, I found it quite good. It is all integrated. I just need to select the chip type and topology structure and it will be imported automatically. It is really good.

led2015

If the wrong topology is selected, it will lead to incorrect topology and analysis results of xsignal members.

damiaa

Thanks for sharing!