DMA AXI4-Stream to/from AXI4 Memory Map - Scatter-Gather Descriptor List
DVB-T2/T Modulator IP (FPGA Proven)
from Xilinx.
A description of the processing steps follows:
TS Processing. The TS processing block performs rate adaptation functions in Broadcast applications to ensure that variable transmission delays do not result in disturbances of time-critical services such as audio and video. Both normal-mode and HighEfficiency-Mode(HEM) processing is supported.
Null packet deletion. The Null packet deletion block removes null TS packets from the input stream to maximise the capacity available for information services in VCM and ACM modes. The mechanism defined by DVB-T2 allows for complete restoration of the input stream where null packets are necessary to maintain a constant delay.
CRC-8 Encoding. An 8-bit CRC is added to each outgoing TS packet and serves to allow packet-level error detection at the receiver.
Baseband buffer and Padding. The baseband padding block inserts a fixed-length Baseband Header at the start of each BBFRAME and pads to the end of the frame during ACM operation. The structure of the Baseband Header is as described in EN 302 755. Baseband Scrambling.
The baseband scrambler block performs the energy dispersal and transport multiplex adaptation using the DVB randomization polynomial 1+x14+x15. When processing L1-field frames (L1PRE/L1POST), zero padding is added to ensure the non-standard L1 frame length is compliant prior to FEC encoding.
BCH, LDPC Encoders. These blocks systematically encode each frame and append error correction information bits. When processing L1-field frames (L1PRE/L1POST), puncturing is performed where necessary following FEC encoding.
Bit Interleaver and Demux. The bit interleaver block applies block-based and column-twist bit interleaving to the coded frame prior to symbol demultiplexing and mapping.
Mapping and Rotation. This block performs the QAM constellation mapping using the mapping schemes specified by DVB for BPSK, QPSK, QAM16, QAM64 and QAM256. Optionally constellation rotation is applied as indicated by the L1FIELD information fields, together with L1-ACE modifications when enabled.
More detailed info on request, under NDA.
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