Circuits and methods to reduce pin count of a single channel device with a multi-channel serial interface
US9064062B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 20, 2012 |
| Grant date | Jun 23, 2015 |
| Priority date | — |
| Expiry date | Dec 27, 2033 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04H20/88
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A channel selection circuit in a serial audio communication device provides channel selection for insertion or extraction of data to or from a multiplexed serial data stream without the requirement of extra channel selection inputs. The channel selection circuit has multiple counters structured such that each counter represents a channel of the serial data stream. The input of each counter receives one of the multiple synchronizing timing signals. The input of the designated counter receives one timing signal that has the greatest frequency. The remaining counters receive the word select timing signals for determining which channel is being selected. A ready output of each counter is a channel indicator in communication with multiple signal selection circuits for selecting the multiple timing signals to be transferred to a data processing device for inserting or extracting data to or from the multiplexed serial data stream.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.