Asynchronous static ram, ram block, memory block, Random Access Memory

 CY62157EV18 Series 8 Mb (512 K x 16) 1.65 - 2.25 V 55 ns Static RAM - VFBGA-48

https://www.futureelectronics.com/p/semiconductors--memory--RAM--static-ram--asynchronous/cy62157ev18ll-55bvxi-infineon-3728565