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As system-on-chip (SoC) designs become more complex, it is becoming harder to design communication architectures to handle the ever increasing volumes of inter-component communication. Manual traversal of the vast communication design space to synthesize a communication architecture that meets performance requirements becomes infeasible. In this paper, we address this problem by proposing an automated approach for synthesizing cost-effective, bus-based communication architectures that satisfy the performance constraints in a design. Our synthesis flow also incorporates a high-level floorplanning and wire delay estimation engine to evaluate the feasibility of the synthesized bus architecture and detect timing violations early in the design flow. We present case studies of network communication SoC subsystems for which we synthesized bus architectures, detected timing violations and generated core placements in a matter of hours instead of several days it took for a manual effort.