Memory density and organization for high-throughput designs
The CY7C1315BV18-200BZXI is a 18 Mbit QDR II synchronous SRAM organized as 512K x 36 bits — the x36 word width is tailored for networking packet buffers and telecom line-card queues where the data path matches the 36-bit bus width without padding or byte-lane waste. At a 200 MHz clock, the QDR II interface delivers two data transfers per cycle on separate read and write ports, yielding a peak bandwidth of 14.4 Gbit/s (200 MHz × 36 bits × 2). This throughput suits 10 GbE frame buffers, traffic managers, and high-end test equipment that need deterministic latency.
Package, supply, and temperature — what they mean for board fit
The 1.7 V to 1.9 V core supply aligns with 1.8 V nominal FPGA I/O banks, so a shared 1.8 V rail is feasible if the regulator can source the SRAM's transient current without droop below 1.7 V. The 165-FBGA (13x15) footprint is the supplier device package; the base product number CY7C1315 anchors the family for cross-reference checks.
Obsolete — sourcing reality for this QDR II SRAM
Infineon lists the CY7C1315BV18-200BZXI as Obsolete. Because the 165-FBGA footprint and 1.8 V supply are specific to this generation, a drop-in replacement from a different SRAM family is unlikely without a PCB revision. The tray packaging suggests the remaining inventory is suited for prototype or low-volume production runs rather than high-volume reel-fed assembly.