what is Back-annotate?

Feb 15, 2006 9 Replies

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Hi, Dears: I am using QuartusII now. I am not clear to back-annotate. What is = back_annotate? and what's the use of back-annotate?=20 Thank you!



Jude



Usenet is a pure text medium. Please do not post using html or mime encoding. You will be ignored by many as a security risk.

-- "If you want to post a followup via groups.google.com, don't use the broken "Reply" link at the bottom of the article. Click on "show options" at the top of the article, then click on the "Reply" at the bottom of the article headers." - Keith Thompson More details at: Also see

Oy! I like that!

Not the foggiest idea what QuartusII is, perhaps something to do with pint pots. But back- annotation means that changes made in the PCB editor are transferred back to the schematic. So if you've swqapped gates, or changed values, or renamed nets etc. etc. depending on the CAD you may be able to update the schematic to match.

Paul Burke

PS anyone know how to strip the HTML when replying in Thunderbird?

Paul

Tools->Account Settings->Composition & Addressing->Compose Message in HTML unchecked?

Andrew

There's a difference between _composing_ in HTML and _sending_ HTML. You can use HTML editor and send plain text messages. If you don't use any formatting (bold, italic etc.) it will be sent as plain text by default, in other case you'll be asked to choose how to send it (unless you override the default settings to send HTML without asking).

HTH, Marcin

Yes it is, so new messages are composed properly in text. But when REPLYING to a message in HTML, the HTML is retained, and there seems to be no way of getting rid of it.

Paul Burke

No, you're sending plain text, but with chineese code page, just switch back to ISO-8859-2 or US-ASCII (it's Options -> Character coding or similar as I don't have an English version) to make it look like usually.

No, you're sending plain text, but with chineese code page, just switch back to ISO-8859-1 or US-ASCII (it's Options -> Character coding or similar as I don't have an English version) to make it look like usually.

Quartus II is Altera's design software for the FPGAs.

Sophie, when you back annotate a project you are fixing certain design paramaters such as timing, pin locations, the device used, and possibly even the specific implementation of portions of the device. If for example, you implement the design, letting the fitter pick the pin placements, i.e. you did not specify any constraints, you can back annotate the project to fix these locations and hence any future modifications will not undo these locations.

Quartus II is an FPGA design program from Altera.

Back-annotation means that after synthesizing and generating the layout of your device, the real time delays are determined and put back to the original design. This will let you redo the VHDL/Verilog simulation using the real timing compared to first simulation which had no delays.

Adrian

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