For example, one of the Cypress PSoC4 range is presented in a 48-pin package. Where the schematic spreads to several sheets, it is possible to place a block near the associated components.
For a large IC, I partition it into several parts, and I try to be as intuitive as possible. Over the years, I have designed my system to avoid disjointed nets on a single sheet and to have as few intersheet connections as possible. In such a case, a paper copy is your only backup.
#PCAD 2006 CHANGE SHEET WINDOWS#
PCAD - as it evolved through different owners and from DOS to Windows - provides a prime example. Even if your CAD system is called the same name as an earlier incarnation, it may not work with the electronic files in the same way. Another problem, as we shall see in an example in a moment, is that CAD systems evolve, mutate, and even disappear over time. But when you print the document, you don’t have access to the CAD tool and are therefore SOL (sadly out of luck). Now, if you are working within the CAD package, maybe you could argue that it has tools to highlight the net in total, so that you can easily locate and work with it. How do you try figure out whether a pin goes to a connector or a LED on the same sheet, different sheets, or both? I don’t believe this lack of information is unique to the manufacturer I was using. Probably two-thirds of the pins were named as nets that may or may not have connected to one or more nets of the same name on other sheets. The schematic consisted of 15 mini-sheets. The symbol was just a square with 25 pins to a side. I recently purchased a development board that uses a 100-pin microcontroller (MCU).
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