Murali, How many microengines contend, how often and what kind of memory accesses (ordered/optimized etc. SRAM/SDRAM) will determine the latencies. To get a ball-park idea of how latencies are affected by the application being executed on the IXP1200, the link to this paper among others might give you some answers http://www.cs.princeton.edu/nsg/papers/ixp-sosp.html Suresh -----Original Message----- From: S Murali [mailto:tulasi@csa.iisc.ernet.in] Sent: Sunday, January 20, 2002 11:46 AM To: ixp1200@CS.Princeton.EDU Subject: [ixp1200] SRAM Memory Lookup Hello, I would like to know how many CYCLES a microengine takes to do a single SRAM memory lookup ? Is it a constant or does it depend on anything ? How does it differ from SDRAM ? Thanks, -Murali