Globally asynchronous locally synchronous circuit for integrated circuit, has wrapper circuit for receiving data output request signal from external globally asynchronous locally synchronous circuit connected on output side

摘要

The globally asynchronous locally synchronous (GALS) circuit (100) has a wrapper circuit (104) for receiving a data output request signal (REQ-out) from an external globally asynchronous locally synchronous circuit connected on an output side. The external GALS circuit requests output data from a local synchronous circuit module (102). A data output request signal is received by sending a data output confirmation signal (ACK-out) to the external GALS circuit for confirmation. A clock cycle of a data output clock signal is produced on receiving the data output request signal.