An apparatus and a method for handling data between two asynchronous units

摘要

The present invention provides an apparatus and a method for handling data between a first and a second typically completely exclusive unit trough a common unit 300. This is done by mapping the status indicator of the entity 2 200, its value being determined by a position in a rotating shift register, to create a shadow status indicator; determining whether the measured is a defined value; assigning the defined value on the basis of the measured SSSI-value; determining a relationship between a FSI-value and the value; performing operations if a predetermined condition for the relationship is satisfied. The common unit 300 could be a FIFO, the entity 1 100 is then a writing unit, the entity 2 200 is a reading unit, whereas the entity 1 100 creates a write and the entity 2 200 creates a read pointer. The write pointer is then compared to the shadow read pointer the clock. <IMAGE>