scholarly journals Buffer Planning for IP Placement Using Sliced-LFF

VLSI Design ◽  
2011 ◽  
Vol 2011 ◽  
pp. 1-10
Author(s):  
Ou He ◽  
Sheqin Dong ◽  
Jinian Bian ◽  
Satoshi Goto
Keyword(s):  
Simulated Annealing ◽  
Success Rate ◽  
Topological Structure ◽  
Hierarchical Design ◽  
Buffer Insertion ◽  
Design Complexity ◽  
Robust Version ◽  
Buffer Planning ◽  
Ip Cores ◽  
Timing Requirement

IP cores are widely used in modern SOC designs. Hierarchical design has been employed for the growing design complexity, which stimulates the need for fixed-outline floorplanning. Meanwhile, buffer insertion is usually adopted to meet the timing requirement. In this paper, buffer insertion is considered with a fixed-outline constraint using Less Flexibility First (LFF) algorithm. Compared with Simulated Annealing (SA), our work is able to distinguish geometric differences between two floorplan candidates, even if they have the same topological structure. This is helpful to get a better result for buffer planning since buffer insertion is quite sensitive to a geometric change. We also extend the previous LFF to a more robust version called Sliced-LFF to improve buffer planning. Moreover, a 2-staged LFF framework and a post-greedy procedure are introduced based on our net-classing strategy and finally achieve a significant improvement on the success rate of buffer insertion (40.7% and 37.1% in different feature sizes). Moreover, our work is much faster than SA, since it is deterministic without iterations.

scholarly journals IP-Enabled C/C++ Based High Level Synthesis: A Step towards Better Designer Productivity and Design Performance

2014 ◽  
Vol 2014 ◽  
pp. 1-17
Author(s):  
Sharad Sinha ◽  
Thambipillai Srikanthan
Keyword(s):  
Design Methodology ◽  
Arithmetic Functions ◽  
High Level Synthesis ◽  
Mathematical Functions ◽  
Chip Design ◽  
Design Complexity ◽  
Application Characteristics ◽  
Ip Cores ◽  
Program Recognition ◽  
High Level

Intellectual property (IP) core based design is an emerging design methodology to deal with increasing chip design complexity. C/C++ based high level synthesis (HLS) is also gaining traction as a design methodology to deal with increasing design complexity. In the work presented here, we present a design methodology that combines these two individual methodologies and is therefore more powerful. We discuss our proposed methodology in the context of supporting efficient hardware synthesis of a class of mathematical functions without altering original C/C++ source code. Additionally, we also discuss and propose methods to integrate legacy IP cores in existing HLS flows. Relying on concepts from the domains of program recognition and optimized low level implementations of such arithmetic functions, the described design methodology is a step towards intelligent synthesis where application characteristics are matched with specific architectural resources and relevant IP cores in a transparent manner for improved area-delay results. The combined methodology is more aware of the target hardware architecture than the conventional HLS flow. Implementation results of certain compute kernels from a commercial tool Vivado-HLS as well as proposed flow are also compared to show that proposed flow gives better results.

EARLY BUFFER PLANNING WITH CONGESTION CONTROL USING BUFFER REQUIREMENT MAP

2010 ◽  
Vol 19 (05) ◽  
pp. 949-973
Author(s):  
ALI JAHANIAN ◽  
MORTEZA SAHEB ZAMANI
Keyword(s):  
Signal Integrity ◽  
Deep Submicron ◽  
Design Flow ◽  
Buffer Insertion ◽  
Design Quality ◽  
Circuit Performance ◽  
Buffer Planning ◽  
Planning Algorithm ◽  
Buffer Requirement ◽  
Time Overhead

Buffer insertion plays an important role in circuit performance and signal integrity especially in deep submicron technologies. The stage at which buffers are inserted in a design has a large impact on the design quality. Early buffer insertion may cause misestimation due to unknown cell locations whereas buffer insertion after placement may not be very effective because the cell locations have been fixed and buffer resources may be distributed inappropriately. In this paper, a buffer planning algorithm for floor-placement design flow is presented. This algorithm creates a map of buffer requirements in various regions of the design at the floorplanning stage and then enforces the detailed placer to distribute white spaces with respect to the estimated buffer requirement map. Experimental results show that the proposed method improves the performance of attempted circuits with fewer buffers. Furthermore, results show that congestion, routability and design convergence are improved and the auxiliary loops are avoided in the proposed design flow. Our analyses and experiments show that the CPU time overhead of this algorithm is very small.

scholarly journals Improved Simulated Annealing Genetic Algorithm based Low power mapping for 3D NoC

2018 ◽  
Vol 232 ◽  
pp. 02022 ◽  
Author(s):  
Hanna He ◽  
Fang Fang ◽  
Wei Wang
Keyword(s):  
Genetic Algorithm ◽  
Simulated Annealing ◽  
Power Consumption ◽  
Average Power ◽  
Optimal Solution ◽  
Initial Population ◽  
Good Convergence ◽  
Average Power Consumption ◽  
Ip Cores ◽  
On Chip

Mapping of IP(Intellectual Property) cores onto NoC(Network-on-Chip) architectures is a key step in NoCbased designs. Energy is the key parameter to measure the designs. Therefore, we propose an Improved Simulated Annealing Genetic Alogrithm, abbreviated as ISAGA. The algorithm combines the parallelism of Genetic Algorithm(GA) and the local search ability of Simulated Annealing(SA). We improve the initial population selection of GA to get the lower power consumption mapping scheme. The experimental results show that compared with the GA, ISAGA has good convergence and can search the optimal solution quickly, which can effectively reduce the power consumption of the system. In the case of 124 IP cores, the average power consumption of the ISAGA is reduced by 32.0% compared with the GA.

1335: Is there an Inherent Ceiling on the Success Rate of Slings?

2007 ◽  
Vol 177 (4S) ◽  
pp. 440-440
Author(s):  
Kathleen C. Kobashi ◽  
Fred E. Govier ◽  
Tanya M. Nazemi
Keyword(s):  
Success Rate

24: Endopyelotomy for Ureteropelvic Junction Obstruction: What Success Rate can the Patient Expect?

2004 ◽  
Vol 171 (4S) ◽  
pp. 7-7
Author(s):  
Hansjoerg Danuser ◽  
Eduard Dobry ◽  
Fiona C. Burkhard ◽  
Werner W. Hochreiter ◽  
Urs E. Studer
Keyword(s):  
Success Rate ◽  
Ureteropelvic Junction Obstruction ◽  
Ureteropelvic Junction

Klinische Langzeitergebnisse der perkutanen transluminalen Angioplastie bei Patienten mit peripherer arterieller Verschlusskrankheit

VASA ◽  
2002 ◽  
Vol 31 (1) ◽  
pp. 36-42 ◽  
Author(s):  
. Bucek ◽  
Hudak ◽  
Schnürer ◽  
Ahmadi ◽  
Wolfram ◽  
...  
Keyword(s):  
Success Rate ◽  
Clinical Stage ◽  
Ankle Brachial Index ◽  
Clinical Situation ◽  
Clinical Results ◽  
Transluminal Angioplasty ◽  
Term Outcome ◽  
Long Term Outcome

Background: We investigated the long-term clinical results of percutaneous transluminal angioplasty (PTA) in patients with peripheral arterial occlusive disease (PAOD) and the influence of different parameters on the primary success rate, the rate of complications and the long-term outcome. Patients and methods: We reviewed clinical and hemodynamic follow-up data of 166 consecutive patients treated with PTA in 1987 in our department. Results: PTA improved the clinical situation in 79.4% of patients with iliac lesions and in 88.3% of patients with femoro-popliteal lesions. The clinical stage and ankle brachial index (ABI) post-interventional could be improved significantly (each P < 0,001), the same results were observed at the end of follow-up (each P < 0,001). Major complications occurred in 11 patients (6.6%). The rate of primary clinical long-term success for suprainguinal lesions was 55% and 38% after 5 and 10 years (femoro-popliteal 44% and 33%), respectively, the corresponding data for secondary clinical long-term success were 63% and 56% (60% and 55%). Older age (P = 0,017) and lower ABI pre-interventional (P = 0,019) significantly deteriorated primary clinical long-term success for suprainguinal lesions, while no factor could be identified influencing the outcome of femoro-popliteal lesions significantly. Conclusion: Besides an acceptable success rate with a low rate of severe complications, our results demonstrate favourable long-term clinical results of PTA in patients with PAOD.

Bipolar radiofrequency induced thermotherapy and 1064 nm Nd:Yag laser in endovenous occlusion of insufficient veins: short term follow up results

VASA ◽  
2011 ◽  
Vol 40 (3) ◽  
pp. 235-240 ◽  
Author(s):  
Krnic ◽  
Sucic
Keyword(s):  
Side Effects ◽  
Success Rate ◽  
Nd:Yag Laser ◽  
Main Stem ◽  
Short Term ◽  
Main Trunk ◽  
Bipolar Radiofrequency ◽  
Saphenous Veins ◽  
Skin Redness ◽  
Complete Failure

Background: The aim of this study is to report our results in main stem vein closure using the bipolar radiofrequency induced thermotherapy (RFITT) system and the 1064nm Nd:Yag laser. Patients and methods: 44 incompetent main stem veins (37 great saphenous veins, one lesser saphenous vein, and 6 anterior accessory saphenous veins) in 29 patients were treated using RFITT. 53 incompetent main stem veins (45 great saphenous veins, 4 lesser saphenous veins, and 4 anterior accessory saphenous veins) in 43 patients were treated endovenously with 1064 nm Nd:Yag laser. All patients underwent postoperative duplex scanning within a month after procedure, as well as a short interview regarding postoperative discomfort. Results: In main stem veins treated with RFITT, the success rate within the first month was 86,4 % (38 out of 44 veins). Complete failure rate was 13,6 % (6 out of 44 veins). In 53 main stem veins treated by 1064 nm Nd:Yag laser, the success rate was 100 %, consisting of 98,1 % complete success (52/53 veins), and 1,9 % partial success (1/53 veins). None of the patients treated with RFITT experienced postoperative adverse effects, whereas 13/43 (30,2 %) patients treated with laser had to use oral analgesics after the treatment, and 21/43 (48,8 %) patients reported transient skin changes, such as bruising or skin redness. Conclusions: RFITT system was fairly efficient in the short term for closure of main trunk veins, whereas longer term results are still scarce. Postoperative side effects of RFITT were minimal. 1064nm Nd:Yag laser, according to short term results, proved to be very effective for main stem vein closure. Postoperative side effects related to 1064 nm Nd:Yag endovenous laser treatment proved to be minor, transient, and acceptable.

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