Data transmission synchroniser.

摘要

The invention concerns a data transmission synchroniser for transferring data from a source to a reception unit, the source and reception unit being asynchronous with respect to another one. The synchroniser comprises: a sequence of registers (12 -- 15) through which said data to be transferred is sequentially passed; means for reading the data out of the first of said registers (12) and into the second of said sequence of registers utilising a first clock signal (16) asynchronous with respect to said reception unit; clock signal generating means for generating an intermediate clock signal (17) for reading the data out of said second register (13), the intermediate clock signal (17) being more nearly in synchronisation with said reception unit than said data source; and means for reading data out of the final register (13) of said sequence with a clock signal (19) in synchronism with said reception unit. Preferably the sequence of registers (12 -- 15) includes a plurality of intermediate registers (13, 14) between said first register and said final register, and said clock signal generating means are operative to generate a sequence of intermediate clock signals (17, 18) for each of said respective intermediate registers.