Asynchronous data transmission system with state variable memory and handshaking protocol circuits
US4390969A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 21, 1980 |
| Grant date | Jun 28, 1983 |
| Priority date | — |
| Expiry date | Apr 21, 2000 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F13/18
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
This disclosure relates to a system and method for realizing asynchronous sequential circuits in a manner analagous to the stored state method for synchronous sequential circuits. The circuit is a stored state circuit including a memory and an output register with an input line and an input request line coupled to the memory and the output register having an output data line and an output acknowledge line. A pulse generator is coupled to the input request line so as to generate a timing signal, for transmission to the output register, a fixed period of time after receipt of a request signal on the input request line. A request signal will not appear on the input request line until a data signal on the input data line has stabilized. Furthermore, an acknowledge signal will not be generated until a signal on the output data line has stabilized. In this manner, an asynchronous sequential circuit is constructed which allows for utilization of existing component parts and provides for hazard-free and race-free implementations.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.