help me to explain some glossaries

Altera_Forum · ‎02-07-2006

Altera FPGA device is named by LEs (logic element) i.e.: ep1c6 (6 means 6k LEs)

1. what's the LC(logic cell) ? Does it have some relationship whith LE?

2. LE , LC contain how many gates normally

Altera_Forum · ‎02-07-2006

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originally posted by mountain8848@Feb 7 2006, 07:55 AM

altera fpga device is named by les (logic element) i.e.: ep1c6 (6 means 6k les)

1. what's the lc(logic cell) ? does it have some relationship whith le?

2. le , lc contain how many gates normally

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Hi Mountain8848,

Long history in what is an LC(logic cell), LE (Logic Element) and MC(Macrocell).

The best answers are found here in Altera's Glossary of terms:

http://www.altera.com/literature/glossary/glossary.pdf (http://www.altera.com/literature/glossary/glossary.pdf)

The Logic Cell is a generic term to mean either an LE or MC depending on the architecture. LE are Look-up-table (LUT) based cells in the SRAM devices (FLEX, APEX, Stratix, Cyclone etc...) and MC are p-term based cells in the MAX families.

Here is an interesting press release:

http://www.altera.com/corporate/news_room/...easurement.html (http://www.altera.com/corporate/news_room/releases/releases_archive/2001/products/pr-logic_measurement.html)

As for how many gates in an LE? You would have to guess how much logic you can effectively pack into a 4 input LUT along with the DFF.

Regards,

-ATJ