FPGA Gate Counting
Methodology... |
FPGA Gate Counting Methodology...
Author: ¾çâ¿ì...
Date: 1999.2.9
Subject: FPGAÀÇ Gate¼ö¸¦ ÆľÇÇÏ´Â
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Gate¼ö´Â FPGA·Î ¼³°è¸¦ÇÏ´Â »ç¶÷¿¡°Ô ¼·Î´Ù¸¥ Á¾·ù(ȤÀº ¼·Î´Ù¸¥ Vendor)ÀÇ FPGAµéÀÇ ¿ë·®ºñ±³¿¡ °øÅëÀûÀ¸·Î Âü°íÇÒ ¼ö ÀÖ´Â °üÁ¡À» Á¦°øÇÑ´Ù... ÀÌ·¯ÇÑ Á¡¿¡¼ "ÃÖ´ë Logic Gate¼ö"´Â FPGAÀÇ Gate¼ö¸¦ °è»êÇϴµ¥¿¡´Â °¡Àå À¯¿ëÇÑ ´ÜÀ§ÀÌ´Ù...
Á¤ÀÇ: ÃÖ´ë Logic Gate¼ö |
ÃÖ´ë Logic Gate¼ö = (Logic BlockÀÇ ¼ö X Logic Block´ç Logic CellÀÇ ¼ö X ÃÖ´ë Logic Cell Utilization°ª) X 12 |
Âü°í»çÇ×:
Logic Block°ú "Logic Cell"°£ÀÇ º¯È¯Ç¥
Company |
Family |
Logic |
Total |
Max |
Comments |
Xilinx |
XC4000E |
CLB |
2.2 |
100% |
Each XC4000 Series CLB provides 2 Logic Cells and an additional 3-input look-up-table. |
XC4000EX |
CLB |
2.2 |
100% |
||
XC5200 |
LC |
1.0 |
100% |
Fully independent Logic Cell inputs & outputs. |
|
Altera |
FLEX8000A |
LE |
1.0 |
80% |
Altera's "FLEX 8000 Handbook" (p.119) recommends leaving 20% logic cells unused to accommodate future design modifications. |
FLEX10K |
LE |
1.0 |
80% |
||
Lucent |
ORxCxxA |
PFU |
4.0 |
83% |
Lucent devices have lower utilization due to sharing og Logic Cell input and output signals. |
*Logic Cell UtilizationÀº ÀԷ°ú Ãâ·ÂÀÇ °øÀ¯³ª Á¦ÇÑµÈ Routing ÀÚ¿ø¿¡ ÀÇÇؼ Á¦ÇѵȴÙ...
Gate Count ¿¹Á¦:
Áú¹®) XC4010E¿Í FLEX EPF10K20Àº ¾ó¸¶³ª ¸¹Àº Gate¸¦ Á¦°øÇϴ°¡...?
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XC4010E´Â 400°³ÀÇ Configurable Logic Blocks (CLBs)¸¦ °¡Áö°í ÀÖ°í, °¢°¢ÀÇ XC4010E CLB´Â 2.2 Logic CellÀÌ´Ù... XC4000 SeriesÀÇ ±¸Á¶´Â Device Àüü LCsÀÇ 100%±îÁö Utilize°¡ °¡´ÉÇÏ°í, °¢ Logic CellÀº 12°³ÀÇ Logic Gate¸¦ Á¦°øÇϹǷÎ
XC4010E Gate¼ö = (400 CLBs) X (2.2 LCs per CLB) X (1.0 Utilization) X (12 Gate per LC) = 10,560 ÃÖ´ë Logic Gate (´ë·« 10KÀÇ ÃÖ´ë Logic Gate)
FLEX EPF10K20Àº 1152°³ÀÇ Logic Element (LEs)¸¦ °¡Áö°í ÀÖ°í, °¢°¢ÀÇ FLEX 10K LE´Â 1°³ÀÇ Logic Cell°ú µ¿ÀÏÇÏ´Ù... FLEXÀÇ ±¸Á¶´Â Device Àüü LCsÀÇ 80%±îÁö Utilize°¡ °¡´ÉÇÏ°í, °¢ Logic CellÀº 12°³ÀÇ Logic Gate¸¦ Á¦°øÇϹǷÎ
EPF10K20 Gate¼ö = (1152 LEs) X (1 LCs per LE) X (0.8 Utilization) X (12 Gate per LC) = 11,059 ÃÖ´ë Logic Gate (´ë·« 11KÀÇ ÃÖ´ë Logic Gate)
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