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IEEE/ICACT20260323 Slide.12        [Big Slide]       [YouTube]	Oral Presentation
	The two-level index enables O(1) lookup even when most metadata resides in DDR. L1 is a per-flow directory that stores the window bounds and pointers to the L2 chain, and hot entries are cached in on-chip SRAM. L2 consists of fixed-size segments in DDR_idx, each containing K address entries. Given (flow, seq), we compute the offset ¥Ä from the window start and use division/modulo to locate the segment and the entry. Epoch bits provide a lightweight validity check to prevent stale references after overwrite or eviction.

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