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Device Buffering and OBFF1008060402006.211 6.212 6.213 6.214 6.215 6.216 6.217 6.218 6.219 6.22 6.221Bytes120100806040200Bytes1206.211 6.2111 6.2112 6.2113 6.2114 6.2115 6.2116 6.2117EP Initiated Traffic RC Initiated Traffic INTA AssertedTimestamp (seconds)• Trace shows ATSC receiverflushing data to hostmemory every ~300usec• Data is consumed by hostprocessor every ~10msec(Interrupt)• At ~20mbps, need only~2.5KB of memory for1msec buffering. Will havepositive impact on power• Implement sufficient device buffering to maximize energyefficiency– Will reduce frequent host memory accesses and allow for OBFF activity alignment– Allow for a minimum of ~300usec of inactivity between bursts. Recommend ~1msec forgreater energy efficiency when performance permits• Classify device-initiated transactions: critical vs. deferrable– Perform critical transactions as necessary– Align deferrable transactions to platform activity• No deferrable accesses in Idle Window• Memory accesses in OBFF Window• Interrupts and Memory accesses in Active WindowSource: Intel Corporation31