300 MHz QDR II SRAM — 18 Mbit in a 165-ball FBGA
It operates at a 300 MHz clock frequency, delivering back-to-back read and write transactions on every clock edge without dead cycles — the defining advantage of the QDR II bus for high-throughput buffer applications. Typical deployment targets include network line cards, telecom switch fabrics, and high-speed data acquisition systems where deterministic latency and sustained bandwidth are required.
At 300 MHz, the QDR II architecture allows independent read and write ports to operate simultaneously, effectively doubling the data bandwidth compared to a common-I/O SRAM at the same clock rate. For a 9-bit-wide device, the peak data rate is 600 MB/s (300 MHz x 2 transfers per clock x 9 bits). The 165-FBGA package requires a controlled-impedance PCB stackup and matched trace lengths for the address, data, and control buses — a four-layer board with a dedicated ground plane is the practical minimum.