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| Speaker: |
Professor Duncan M. (Hank) Walker,
Professor and Graduate Advisor, Texas A&M University
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| Title: |
"At-Speed Test Considering Deep Submicron Effects" |
| Host: |
Sani Nassif |
| When: |
Friday, May 23, 2008
10:30am - 12:00pm |
| Details: |
 Download Slides |  View Slideshow |  Video |
Abstract:
Timing optimization has made the timing performance integrated circuits increasingly sensitive to small delay defects and process variation. Traditional path delay and transition fault test approaches are increasingly inadequate, leaving functional or system test as the only options that accurately correlate test speed to functional speed. In addition, crosstalk, power supply noise, and temperature effects during structural delay test are often much worse than in functional operation, resulting in delay tests rejecting good chips.
This talk will describe a set of models, algorithms and tools, including the CodSim fault simulator and CodGen automatic test pattern generator that generate the K longest paths through each gate/line (KLPG), and how the number of paths tested depends on process spatial correlation. This work includes a recently developed dynamic compaction algorithm the produces pattern counts competitive with transition fault tests. I will discuss the low-cost power supply noise models that have been developed and demonstrated to control noise during compaction. I will also describe early results with a pattern reordering algorithm that produces delay tests with near-constant power, so that the chip temperature rises linearly during test, and so can be easily characterized. Finally, I will discuss our approach to incorporating capacitive crosstalk in delay tests.
Bio:
Duncan M. Hank Walker is professor and graduate advisor in the Department of Computer Science at Texas A&M University. His primary research interest is integrated circuit test and diagnosis, with additional interests in yield modeling, statistical static timing, variation-tolerant design and computer architecture. He received a BS in engineering from Caltech and MS and PhD in computer science from Carnegie Mellon University. He has worked at Hughes Aircraft and Digital Equipment and spent two months at IBM Austin Research Laboratory in the summer of 1997.
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| Speaker: |
Professor A. L. Narasimha Reddy
Department of Electrical & Computer Engineering, Texas A&M University
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| Title: |
"Flexible Allocation and management of space in Storage Systems" |
| Host: |
Jian Li |
| When: |
Thursday, May 1, 2008
10:30am - 12:00pm |
| Details: |
Download Slides | View Slideshow | Video |
Abstract:
Current file systems allocate storage statically at the time of their creation. This results in many suboptimal scenarios, for example: (a) space on the disk is not allocated well across multiple file systems, (b) data is not organized well for typical access patterns. We propose Virtual Allocation for flexible storage allocation. Virtual allocation separates storage allocation from the file system. It employs an allocate-on-write strategy, which lets applications fit into the actual usage of storage space without regard to the configured file system size. This improves flexibility by allowing storage space to be shared across different file systems. We present the design of virtual allocation and an evaluation of it through benchmarks based on a prototype system on Linux.
We describe two applications of Virtual Allocation. We consider (1) the problem of balancing locality and load in networked storage systems with multiple storage devices (or bricks) and (2) the problem of data distribution in heterogeneous devices such as flash and disk drives. We employ virtual allocation in designing user-optimal data migration in networked storage systems and in matching file characteristics to device characteristics. We will present results from Linux-based prototypes.
Bio:
Narasimha Reddy is currently a professor in the department of Electrical and Computer Engineering at Texas A & M University. During 1990-95, he was a research staff member at IBM Almaden Reserch Center. Reddy's research interests are in storage systems, computer networks and multimedia systems. Reddy receiveda Ph.D. from Univeristy of Illinois in 1990. He received an NSF Career award in 1996. One of his papers has been cited "for one of the most influential papers from the 1st ACM Multimedia Conference". |
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