log_us HDL Worker

Pipelined HDL implementation of logarithm, allowing one input and one output every FPGA clock cycle, with a delay of 24 clock cycles through the pipeline.

Detail

The logarithm primitive produces the logarithm result. The result of the logarithm primitive is scaled by a power of two. The output of the scaling is rounded to the nearest integer by the rounding half-up primitive. As the logarithm result is a 16-bit fixed point value, setting the output scaling factor greater than 16 adds no further precision to the output.

The implementation interprets input values of 0 as a 1. Output values are limited to 65535 if exceeded.

Worker Properties

  • ocpi_buffer_size_output

    • Type: ushort

    • Access:

      • Parameter: False

      • Writable: False

      • Initial: True

      • Volatile: False

      • Read back: False

    • Default value: 0

  • ocpi_blocked_output

    • Type: ulong

    • Access:

      • Parameter: False

      • Writable: False

      • Initial: False

      • Volatile: True

      • Read back: False

    • Default value: None

  • ocpi_max_latency_output

    • Type: ushort

    • Access:

      • Parameter: True

      • Writable: False

      • Initial: False

      • Volatile: False

      • Read back: False

    • Default value: None

  • ocpi_latency_output

    • Type: ushort

    • Access:

      • Parameter: False

      • Writable: False

      • Initial: False

      • Volatile: True

      • Read back: False

    • Default value: None

  • ocpi_messages_output

    • Type: ulong

    • Access:

      • Parameter: False

      • Writable: False

      • Initial: False

      • Volatile: True

      • Read back: False

    • Default value: None

  • ocpi_bytes_output

    • Type: ulong

    • Access:

      • Parameter: False

      • Writable: False

      • Initial: False

      • Volatile: True

      • Read back: False

    • Default value: None

Worker Ports

    Inputs:

  • input

    • Protocol: ushort_timed_sample

    • Optional: False

    • Outputs:

  • output

    • Protocol: ushort_timed_sample

    • Optional: False

Utilisation

Utilization reporting is not currently implemented.