Conflux – An Asynchronous 2-to-1 Multiplexor for Time-Division Multiplexing and Clock-less, Token-less Readout
- Fermilab
This paper describes an independent, self-arbitrating asynchronous two-to-one multiplexor called Conflux. Conflux can be used to implement clock-less and token-less Time-Division Multiplexing between two sources. This capability can then be used to create a clock-less and token-less aggregate data bus which can be used as a complete asynchronous readout architecture for a chip, a part of a chip or an entire multi-chip system. Conflux utilizes a classic, four-phased asynchronous handshake on both of its input ports as well as on its output port. Asynchronous Request is bundled with Data to ensure consistent propagation delay. The Request is also differential to account for propagation delay differences between Logical Ones and Zeros. Arbitration between the two Conflux input streams is accomplished by three Set-Reset latches. Finally, Conflux cells were used successfully to implement the readout architecture of the FCP130 prototype chip. Tests indicate single Conflux stage delays of 1.8ns and a bandwidth of approximately 20 Gbps in 130nm CMOS.
- Research Organization:
- Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), High Energy Physics (HEP)
- DOE Contract Number:
- AC02-07CH11359
- OSTI ID:
- 1556968
- Report Number(s):
- FERMILAB-PUB-19-219-PPD; 1746394
- Journal Information:
- IEEE Transactions on VLSI Systems, Journal Name: IEEE Transactions on VLSI Systems
- Country of Publication:
- United States
- Language:
- English
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