IEICE TRANSACTIONS on Information
COGRE: A Novel Compact Logic Cell Architecture for Area Minimization
Summary :
Because of numerous circuit resources of FPGAs, there is a performance gap between FPGAs and ASICs. In this paper, we propose a small-memory logic cell, COGRE, to reduce the FPGA area. Our approach is to investigate the appearance ratio of the logic functions in a circuit implementation. Moreover, we group the logic functions on the basis of the NPN-equivalence class. The results of our investigation show that only small portions of the NPN-equivalence class can cover large portions of the logic functions used to implement circuits. Further, we found that NPN-equivalence classes with a high appearance ratio can be implemented by using a small number of AND gates, OR gates, and NOT gates. On the basis of this analysis, we develop COGRE architectures composed of several NAND gates and programmable inverters. The experimental results show that the logic area of 4-COGRE is smaller than that of 4-LUT and 5-LUT by approximately 35.79% and 54.70%, respectively. The logic area of 8-COGRE is 75.19% less than that of 8-LUT. Further, the total number of configuration memory bits of 4-COGRE is 8.26% less than the number of configuration memory bits of 4-LUT. The total number of configuration memory bits of 8-COGRE is 68.27% less than the number of configuration memory bits of 8-LUT.
- Publication
- IEICE TRANSACTIONS on Information Vol.E95-D No.2 pp.294-302
- Publication Date
- 2012/02/01
- Publicized
- Online ISSN
- 1745-1361
- DOI
- 10.1587/transinf.E95.D.294
- Type of Manuscript
- Special Section PAPER (Special Section on Reconfigurable Systems)
- Category
- Architecture
Authors
Keyword
Latest Issue
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Masahiro IIDA, Motoki AMAGASAKI, Yasuhiro OKAMOTO, Qian ZHAO, Toshinori SUEYOSHI, "COGRE: A Novel Compact Logic Cell Architecture for Area Minimization" in IEICE TRANSACTIONS on Information,
vol. E95-D, no. 2, pp. 294-302, February 2012, doi: 10.1587/transinf.E95.D.294.
Abstract: Because of numerous circuit resources of FPGAs, there is a performance gap between FPGAs and ASICs. In this paper, we propose a small-memory logic cell, COGRE, to reduce the FPGA area. Our approach is to investigate the appearance ratio of the logic functions in a circuit implementation. Moreover, we group the logic functions on the basis of the NPN-equivalence class. The results of our investigation show that only small portions of the NPN-equivalence class can cover large portions of the logic functions used to implement circuits. Further, we found that NPN-equivalence classes with a high appearance ratio can be implemented by using a small number of AND gates, OR gates, and NOT gates. On the basis of this analysis, we develop COGRE architectures composed of several NAND gates and programmable inverters. The experimental results show that the logic area of 4-COGRE is smaller than that of 4-LUT and 5-LUT by approximately 35.79% and 54.70%, respectively. The logic area of 8-COGRE is 75.19% less than that of 8-LUT. Further, the total number of configuration memory bits of 4-COGRE is 8.26% less than the number of configuration memory bits of 4-LUT. The total number of configuration memory bits of 8-COGRE is 68.27% less than the number of configuration memory bits of 8-LUT.
URL: https://global.ieice.org/en_transactions/information/10.1587/transinf.E95.D.294/_p
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@ARTICLE{e95-d_2_294,
author={Masahiro IIDA, Motoki AMAGASAKI, Yasuhiro OKAMOTO, Qian ZHAO, Toshinori SUEYOSHI, },
journal={IEICE TRANSACTIONS on Information},
title={COGRE: A Novel Compact Logic Cell Architecture for Area Minimization},
year={2012},
volume={E95-D},
number={2},
pages={294-302},
abstract={Because of numerous circuit resources of FPGAs, there is a performance gap between FPGAs and ASICs. In this paper, we propose a small-memory logic cell, COGRE, to reduce the FPGA area. Our approach is to investigate the appearance ratio of the logic functions in a circuit implementation. Moreover, we group the logic functions on the basis of the NPN-equivalence class. The results of our investigation show that only small portions of the NPN-equivalence class can cover large portions of the logic functions used to implement circuits. Further, we found that NPN-equivalence classes with a high appearance ratio can be implemented by using a small number of AND gates, OR gates, and NOT gates. On the basis of this analysis, we develop COGRE architectures composed of several NAND gates and programmable inverters. The experimental results show that the logic area of 4-COGRE is smaller than that of 4-LUT and 5-LUT by approximately 35.79% and 54.70%, respectively. The logic area of 8-COGRE is 75.19% less than that of 8-LUT. Further, the total number of configuration memory bits of 4-COGRE is 8.26% less than the number of configuration memory bits of 4-LUT. The total number of configuration memory bits of 8-COGRE is 68.27% less than the number of configuration memory bits of 8-LUT.},
keywords={},
doi={10.1587/transinf.E95.D.294},
ISSN={1745-1361},
month={February},}
Copy
TY - JOUR
TI - COGRE: A Novel Compact Logic Cell Architecture for Area Minimization
T2 - IEICE TRANSACTIONS on Information
SP - 294
EP - 302
AU - Masahiro IIDA
AU - Motoki AMAGASAKI
AU - Yasuhiro OKAMOTO
AU - Qian ZHAO
AU - Toshinori SUEYOSHI
PY - 2012
DO - 10.1587/transinf.E95.D.294
JO - IEICE TRANSACTIONS on Information
SN - 1745-1361
VL - E95-D
IS - 2
JA - IEICE TRANSACTIONS on Information
Y1 - February 2012
AB - Because of numerous circuit resources of FPGAs, there is a performance gap between FPGAs and ASICs. In this paper, we propose a small-memory logic cell, COGRE, to reduce the FPGA area. Our approach is to investigate the appearance ratio of the logic functions in a circuit implementation. Moreover, we group the logic functions on the basis of the NPN-equivalence class. The results of our investigation show that only small portions of the NPN-equivalence class can cover large portions of the logic functions used to implement circuits. Further, we found that NPN-equivalence classes with a high appearance ratio can be implemented by using a small number of AND gates, OR gates, and NOT gates. On the basis of this analysis, we develop COGRE architectures composed of several NAND gates and programmable inverters. The experimental results show that the logic area of 4-COGRE is smaller than that of 4-LUT and 5-LUT by approximately 35.79% and 54.70%, respectively. The logic area of 8-COGRE is 75.19% less than that of 8-LUT. Further, the total number of configuration memory bits of 4-COGRE is 8.26% less than the number of configuration memory bits of 4-LUT. The total number of configuration memory bits of 8-COGRE is 68.27% less than the number of configuration memory bits of 8-LUT.
ER -
English
