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MOS transistors, tran, tri1 and pullup in Verilog

Altera_Forum
Honored Contributor II
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Hi guys. 

 

I am a student and i currently started studying Switch Level Modeling in Verilog. And there are some things, that i don't undestand. 

 

1. MOS transistors are represented as unidirectional gates. Their models are almost similar to bufif elements, rather then to the electrical models of transistors. What are the reasons of using such a poor model? (there is no need of using more complex model, or more complex model can't be implemented in terms of event-driven modeling) 

 

2. What it is the difference between using tri1 net and connecting to the wire a pullup gate? When should i use first and second? 

 

3. What is the difference between wire and connection of 2 elements with tran element? 

 

Thnx
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