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¿µ¹®Á¦¸ñ(English Title) |
Low-Energy Intra-Task Voltage Scheduling using Static Timing Analysis |
ÀúÀÚ(Author) |
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¿ø¹®¼ö·Ïó(Citation) |
VOL 28 NO. 11 PP. 0561 ~ 0571 (2001. 12) |
Çѱ۳»¿ë (Korean Abstract) |
CMOS ȸ·ÎÀÇ Àü·Â ¼Ò¸ð´Â °ø±Þ Àü¾ÐÀÇ Á¦°ö¿¡ ºñ·ÊÇϱ⠶§¹®¿¡ °ø±Þ Àü¾ÐÀ» ³·Ãß´Â °ÍÀÌ Àü·Â ¼Ò¸ð¸¦ ÁÙÀÌ´Â µ¥ ¸Å¿ì È¿°úÀûÀÌ´Ù. º» ³í¹®¿¡¼´Â ÀúÀü·Â °æ¼º ½Ç½Ã°£ ÀÀ¿ëÇÁ·Î±×·¥À» À§ÇÑ Å½ºÅ©³» Àü¾Ð ½ºÄÉÁÙ¸µ ¾Ë°í¸®ÁòÀ» Á¦¾ÈÇÑ´Ù. Á¤Àû ½Ã°£ ºÐ¼® ±â¹ýÀ» ¹ÙÅÁÀ¸·Î Á¦¾ÈµÈ ÀÌ ¾Ë°í¸®ÁòÀº °¢°¢ÀÇ Å½ºÅ© ³»ºÎ¿¡¼ ÇÁ·Î¼¼¼ÀÇ °ø±Þ Àü¾ÐÀ» Á¶Á¤ÇÑ´Ù. Á¦¾ÈµÈ ¾Ë°í¸®Áò¿¡ ÀÇÇØ Àü¾Ð ½ºÄÉÁÙ¸µµÈ ÇÁ·Î±×·¥Àº ¸ðµç À¯ÈÞ ½Ã°£À» ¿ÏÀüÈ÷ ÀÌ¿ëÇÔÀ¸·Î½á Ç×»ó ÇÁ·Î±×·¥ÀÇ ¼öÇàÀ» ¸¶°¨ ½Ã°£¿¡ ±ÙÁ¢ÇÏ¿© ³¡³ªµµ·Ï ÇÏ¿© ¸¹Àº Àü·Â °¨¼Ò È¿°ú¸¦ ¾òÀ» ¼ö ÀÖ´Ù. Á¦¾ÈµÈ ¾Ë°í¸®ÁòÀÇ È¿°ú¸¦ °ËÁõÇϱâ À§ÇØ ÀϹÝÀûÀÎ ÇÁ·Î±×·¥À» µ¿Àû Àü¾ÐÀ» »ç¿ëÇÏ´Â °°Àº ±â´ÉÀÇ ÇÁ·Î±×·¥À¸·Î ÀÚµ¿À¸·Î º¯È¯ÇÏ´Â ¼ÒÇÁÆ®¿þ¾î µµ±¸µµ °³¹ßµÇ¾ú´Ù. ½ÇÇè °á°ú, ÀÚµ¿È ¼ÒÇÁÆ®¿þ¾î µµ±¸¿¡ ÀÇÇØ º¯È¯µÈ MPEG-4 ºÎÈ£±â¿Í º¹È£±âÀÇ ÀúÀü·Â ¹öÀüÀÌ Àü¿ø Â÷´Ü ±â´ÉÀ» °¡Áø °íÁ¤ Àü¾Ð ½Ã½ºÅÛ¿¡¼ ½ÇÇàµÈ ¿ø·¡ ÇÁ·Î±×·¥¿¡ ºñÇÏ¿© Àü·Â ¼Ò¸ð°¡ 7¡25%¿¡ ºÒ°úÇÔÀ» ¾Ë ¼ö ÀÖ¾ú´Ù. |
¿µ¹®³»¿ë (English Abstract) |
Since energy consumption of CMOS circuits has a quadratic dependency on the supply voltage, lowering the supply voltage is the most effective way of reducing energy consumption. We propose an intra-task voltage scheduling algorithm for low-energy hard real-time applications. Based on a static timing analysis technique, the proposed algorithm controls the supply voltage within an individual task boundary. By fully exploiting all the slack times, a scheduled program by the proposed algorithm always complete its execution near the deadline, thus achieving a high energy reduction ratio. In order to validate the effectiveness of the proposed algorithm, we built a software tool that automatically converts a DVS-unaware program into an equivalent low-energy program. Experimental results show that the low-energy version of an MPEG-4 encoder/decoder (converted by the software tool) consumes less than 7¡25% of the original program running on a fixed-voltage system with a power-down mode. |
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