Principles of VLSI RTL Design: A Practical Guide by Sanjay Churiwala

By Sanjay Churiwala

In the method of built-in circuit layout, front-end actions commence with a sign up move point (RTL) description, of the performance wanted from the IC.� in the course of next steps within the layout move, matters may well come up regarding testability, info synchronization throughout clock domain names, synthesizability, energy intake, routability, and so on. that are a functionality of ways the RTL used to be initially written.

As a end result, RTL designers have to look after many elements which could have influence on later steps within the layout technique. in view that RTL layout is much less approximately being a brilliant engineer, and extra approximately figuring out the downstream implications of your paintings, this publication explains these a variety of points, their importance, what warning has to be taken in the course of RTL layout and why.� Readers will make the most of a hugely useful method of the basics of uncertainties round performance, clock area crossing and clock synchronization, layout for try and testability, strength intake, static timing research, timing exception dealing with, and routing congestion.

Hopefully, this e-book will locate its position within the hearts and minds of somebody who
generates RTL code. This contains RTL designers in addition to these writing tools
that generate RTL. really new RTL designers will locate this booklet to be a single-source of fascinating, wealthy and valuable knowledge.� skilled RTL designers may be in a position to savour and cement a few already recognized recommendations, given the point of interest on functional occasions encountered in actual designs.

* presents a hugely available, single-source connection with all key themes necessary to an RTL fashion designer;
* Describes intimately particular actions/cautions that dressmaker must think about in layout to prevent difficulties in downstream implementation;
* Covers content material according to useful event with various genuine designs from huge semiconductor layout companies.

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So, applications which do not require high performance are operated at lower frequency and applications which require high performance are operated at higher frequency. Hence, there may be several clocks running at different frequencies on the same chip. So the challenge is whether your chip keeps all the data intact and maintains its integrity as it travels different applications running asynchronously and most probably on different clock domains. When data crosses from one clock domain to the other, it is called as Clock Domain Crossing (CDC).

They are specified in a side file called as SDC file. Mainly, there are two types of paths specified for timing exception: False Paths and MultiCycle Paths. False path is that path between two points of the circuit which is structurally present in the design but there is no requirement to meet specific timing (and hence would not hamper the normal speed of the system) for data to travel between these 2 points. An example of a false path between 2 flops is a path at asynchronous CDC as shown in Fig.

Clk2 is delayed from Clk1 – by a few deltas (these, additional deltas could be due to clock-gating – for example). 3 Feedthroughs 31 Clk1 is also used in the sensitivity list of a process block that updates a signal q1. There will be one delta – for generation of q1. process (Clk1) begin if Clk1 event and Clk1= 1 then q1 <= data; -- one delta from Clk1 end if; end process; Clk2 is used in the sensitivity list of another process block (excerpt below) that samples q1. Because, Clk2 is delayed by a few deltas, by the time the below mentioned process block is triggered; q1 is already updated.

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