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PDCCH In Data Format

Umesh Donta
Prodigy 120 points

Hi All,

Please tel me how the input Data format for PDCCH BCP is given.Since for Format 1A has 27 bits.

Regards,

Umesh

  • 0
    TI__Mastermind 30405 points

    Hi Umesh,

    BCP can be used for PDCCH CRC attachment only for single PDCCH case. However, the CRC sub-module is considered non-functional in Version 1.0 Silicon of C6618/C6670 devices (Please refer to to TCI6618 Silicon Errata document, Advisory 17 : BCP CRC Failure Issue). This means that the first sub-module in your PDCCH processing chain will be CRC only if both of the following conditions are satisfied:

    1. Device Silicon Revision is 2.0 and
    2. Single PDCCH case.

    If any of the above is not true, then the first BCP sub-module in the processing chain will be Encoder (ENC) and CRC needs to be implements in software.

    Input data format: The input data formats for CRC and ENC are given in sections 4.3.1.1 and 4.4.1.1 of the BCP user guide respectively. As mentioned, the input data is bit packed. The size of data input to CRC or ENC should match the code block size (padded to the byte boundary) i.e. the packet length in the CPPI descriptor needs to be the number of complete bytes including the payload. So the size of the input payload for a 27 bit Transport Block or Code block (for CRC or ENC respectively) would be 32-bits.

    Regards
    -Nitin