To transfer data through the device, both write and read operations are required.
Aggregate bandwidth is the total data transfer rate of both device ports. Aggregate Bandwidth = N * W * fmax
Aggregate throughput is the total data transfer rate through the device. Aggregate Throughput = (N * W * fmax) / 2 --> N = Number of Ports = 2 --> W = Port Width --> fmax = maximum port operating frequency
For synchronous, pipelined dual-ports, the aggregate throughput equation above is the best-case that occurs when one port is dedicated to writing and the other is dedicated to reading. Turning around a port from reading-to-writing or writing-to-reading typically results in NOP cycles that degrade throughput. As long as read and writes occur in large bursts, the reduction in throughput is relatively small.