| Presentation | 2013-05-21 Implementation of Speculative Gather System for CMA Rie UNO, Nobuaki OZAKI, Mai IZAWA, Akihito TSUSAKA, Takaaki MIYAJIMA, Hideharu AMANO, |
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| PDF Download Page |  PDF download Page Link |
| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | Cool Mega Array (CMA) is a low power reconfigurable processor array for battery driven mobile devices. A prototype chip CMA-1 consists of 8×8 PE array and μ-controller for controlling data alignment. Because the PE array of CMA is built with a combinatorial circuit, it does not have a signal which tells that operation in the PE array was completed. A propagate delay of the whole PE array corresponding to the operation time was estimated by using the data path and mapping information in the design stage of the application. The timing information for gathering the data was specified in the microcode of the controller. However, since this timing is fixed, it cannot treat the variation of environment temperature and voltage scaling for the PE array. Here, a speculative gather system, which sets the timing of collecting operation results from the PE array dynamically, is proposed. By collecting results twice and comparing them, it guarantees the correctness of the operation results and adjusts the gather timing automatically. The system is implemented on the CMA and the overhead is evaluated. The area overhead is about 0.5%, and power consumption is increased only by 2.1%. By adjusting the gather timing automatically, it is possible to gather the certain results even if temperature or supply voltage is changed. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | Reconfigurable System / Low Power |
| Paper # | RECONF2013-11 |
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| Conference Information | |
| Committee | RECONF |
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| Conference Date | 2013/5/13(1days) |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | |
| Topics (in Japanese) | (See Japanese page) |
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| Paper Information | |
| Registration To | Reconfigurable Systems (RECONF) |
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| Language | JPN |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | Implementation of Speculative Gather System for CMA |
| Sub Title (in English) | |
| Keyword(1) | Reconfigurable System |
| Keyword(2) | Low Power |
| 1st Author's Name | Rie UNO |
| 1st Author's Affiliation | Faculty of science and Technology, Keio University() |
| 2nd Author's Name | Nobuaki OZAKI |
| 2nd Author's Affiliation | Faculty of science and Technology, Keio University |
| 3rd Author's Name | Mai IZAWA |
| 3rd Author's Affiliation | Faculty of science and Technology, Keio University |
| 4th Author's Name | Akihito TSUSAKA |
| 4th Author's Affiliation | Faculty of science and Technology, Keio University |
| 5th Author's Name | Takaaki MIYAJIMA |
| 5th Author's Affiliation | Faculty of science and Technology, Keio University |
| 6th Author's Name | Hideharu AMANO |
| 6th Author's Affiliation | Faculty of science and Technology, Keio University |
| Date | 2013-05-21 |
| Paper # | RECONF2013-11 |
| Volume (vol) | vol.113 |
| Number (no) | 52 |
| Page | pp.pp.- |
| #Pages | 6 |
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