Parallel Test Structure in Latch Based Asynchronous Pipeline

Pipeline is a standard way of decomposing an operation into concurrently operating stages to increase throughout at a moderate increase in area. Pipeline can be implemented both synchronously and asynchronously. In a synchronous pipeline the global clock regulates the communication of data between stages. In asynchronous pipeline the communication of data between stages is regulated by local communication between stages. The latch based asynchronous pipeline is shown in Fig. 1. Two handshake signals and a data bus connect adjacent modules and worked in following way: the sender puts valid data on the data wires and then produces an event on the request wire. The receiver takes the data and then produces an event on the acknowledge wire. The delay between stages of pipeline is adjusted so that the signals satisfy the bundled data convention.