Design Con 2015
Breaking News
Comments
Newest First | Oldest First | Threaded View
KarlS
User Rank
Rookie
re: Bridging the gap between RTL development and design implementation
KarlS   3/31/2011 2:19:09 PM
NO RATINGS
Another aspect is that it is more important to get a big complex design to work than it is to optimize every path and every Boolean function. Forty years ago the opposite was true. Another thing is embedded processors are programmed in a high level language, but the compiling process breaks the code down into such tiny steps that it takes millions of cycles to do any meaningful function. Things like pipelining, branch prediction, multilevel caches are assumed to be absolute necessities but they are not. The typical if/else. for, while, do are just structured ways of expressing compare and jump constructs and assignments can be streamlined by putting them into Reverse Polish Notation. Then the cpu becomes a very small physically, and use of multiport memories allows the statements to execute in very few cycles. The result is that function is coded in high level language, code size is small, power is low because thousands of flipflops do not have to be clocked simultaneously. Changes are done by altering memory content rather than redoing the entire chip compilation and timing. One concern might be that a total chip design may be a few cycles faster, but effectively doing more function per cycle offsets that effect.

lifewingmate
User Rank
Rookie
re: Bridging the gap between RTL development and design implementation
lifewingmate   3/30/2011 6:33:50 AM
NO RATINGS
As a technical communicator writing while the IC architecture team worked with the RTL development and design teams, I encountered the frustrations the author, Odiz, seeks to prevent. This article is an excellent recommendation to improving IC development/design--making sure the teams all around the world compile, aggregate, and build/test designs implications more quickly. One of the solutions my company looked at was company-wide (global) use of an executable specification. Our teams wrote scripts to test the RTL code against the design recommendations. We were able to detect early on the changes that we needed to make before it hit a critical path.

old account Frank Eory
User Rank
Rookie
re: Bridging the gap between RTL development and design implementation
old account Frank Eory   3/29/2011 5:35:29 PM
NO RATINGS
This new tool, DC Explorer, really fills a gap in the methodology.

KarlS
User Rank
Rookie
re: Bridging the gap between RTL development and design implementation
KarlS   3/29/2011 2:29:57 PM
NO RATINGS
As an old timer, one of the most frustrating things is to have to wait for synthesis and or placement to run first. Early in the design, it is the logic that matters, not whether it has been optimized or whether everything feeds an output pine, else it gets synthesized away. I have proposed to map the HDL into a set of generalized classes to be used in an OOP simulator so the hardware function can be used in the software development environment. This way, the existing IP as well as the new design all come together in a program IDE where the debug and compiler checking is much better than in the hardware design flow. Why not take an evolutionary approach such as what this article suggests without all the uncertainties of HLS? After all when HLS matures and obsoletes HDL that too can be used in a similar way.



Flash Poll
Top Comments of the Week
Like Us on Facebook
EE Times on Twitter
EE Times Twitter Feed

Datasheets.com Parts Search

185 million searchable parts
(please enter a part number or hit search to begin)
EE Life
Frankenstein's Fix, Teardowns, Sideshows, Design Contests, Reader Content & More
Max Maxfield

Book Review: Deadly Odds by Allen Wyler
Max Maxfield
11 comments
Generally speaking, when it comes to settling down with a good book, I tend to gravitate towards science fiction and science fantasy. Having said this, I do spend a lot of time reading ...

Martin Rowe

No 2014 Punkin Chunkin, What Will You Do?
Martin Rowe
1 Comment
American Thanksgiving is next week, and while some people watch (American) football all day, the real competition on TV has become Punkin Chunkin. But there will be no Punkin Chunkin on TV ...

Rich Quinnell

Making the Grade in Industrial Design
Rich Quinnell
14 comments
As every developer knows, there are the paper specifications for a product design, and then there are the real requirements. The paper specs are dry, bland, and rigidly numeric, making ...

Martin Rowe

Book Review: Controlling Radiated Emissions by Design
Martin Rowe
1 Comment
Controlling Radiated Emissions by Design, Third Edition, by Michel Mardiguian. Contributions by Donald L. Sweeney and Roger Swanberg. List price: $89.99 (e-book), $119 (hardcover).