APPARATUS FOR PERFORMING DEINTERLEAVING OF A BINARY DATA STREAM AND DVB-T2 RECEIVER

摘要

The disclosure provides an apparatus for performing deinterleaving of a binary data stream and a DVB-T2 receiver, the apparatus comprising a mapping device and a semiconductor memory, the apparatus comprising a mapping device and a semiconductor memory; said mapping device comprising: an input interface arranged to receive said binary data stream and an output interface arranged to output a deinterleaved instance of said binary data stream; a row mapper, operatively connected to said input interface and said semiconductor memory, said row mapper being configured to group data received through said binary data stream into "write" commands for said semiconductor memory; and a row deinterleaver, operatively connected to said semiconductor memory and said output interface, said row deinterleaver being configured to present deinterleaved data, retrieved from said semiconductor memory by means of "read" commands, to said output interface； wherein said semiconductor memory is an SDRAM memory; and wherein each of said "write" commands is an SDRAM write command for at least part of an SDRAM row, said SDRAM write commands being calculated such that said deinterleaved data can be written to and read out in SDRAM burst mode. By providing a row mapper that acts on the received data stream prior to its storage in the external memory, a data ordering can be achieved that permits the retrieval of deinterleaved data at a reduced bandwidth, in particular by using a burst-read operation on an SDRAM memory.