Patent Number: 8,718,806

Title: Slave mode transmit with zero delay for audio interface

Abstract: An apparatus includes a first unit and a second functional units operating in a master-slave configuration. The first and second functional units operate as a master and slave, respectively. The first functional unit conveys clock and framing signals to the second functional unit. The second functional unit includes a buffer and a multiplexer having inputs coupled to the buffer. Digital audio data may be prefetched into the buffer. When a controller of the second functional unit detects assertion of the framing signal, it may cause a change of state to a selection signal provided to the multiplexer. Responsive thereto, the multiplexer selects an input coupled to receive, from the buffer, a next frame of data to be transmitted. A first bit of the frame is transmitted to the first functional unit on the same clock cycle in which assertion of the framing signal was detected.

Inventors: Warren; David S. (Campbell, CA)

Assignee: Apple Inc.

International Classification: G06F 17/00 (20060101); G06F 5/00 (20060101); G06F 13/00 (20060101); G06F 15/16 (20060101); G06F 3/00 (20060101)

Expiration Date: 5/06/12018