Truth Table/Functionality

Some of the input and output ports of the lpm_bustri function are optional. The following three configurations are valid:

  1. Only the input ports data[LPM_WIDTH-1..0] and enabledt are present, and only the output ports tridata[LPM_WIDTH-1..0] are present. This configuration has the following function:
    text-align:left;

    Inputs

    Outputs

    enabledt

    tridata[LPM_WIDTH-1..0]

    0

    Z

    1

    DATA[LPM_WIDTH-1..0]
  2. Only the input ports tridata[LPM_WIDTH-1..0] and enabletr are present, and only the output ports result[LPM_WIDTH-1..0] are present. This configuration has the following function:
    text-align:left;

    Inputs

    Outputs

    enabletr

    result[LPM_WIDTH-1..0]

    0

    Z

    1

    tridata[LPM_WIDTH-1..0]
  3. All ports are present: input ports data[LPM_WIDTH-1..0], enabledt, and enabletr; output ports result[LPM_WIDTH-1..0]; and bidirectional ports tridata[LPM_WIDTH-1..0]. This configuration has the following function:
    text-align:left;

    Input

    Bidirectional

    Output

    enabledt

    enabletr

    tridata[LPM_WIDTH-1..0]

    result[LPM_WIDTH-1..0]

    0

    0

    Z (input)

    Z

    0

    1

    Z (input)

    tridata[LPM_WIDTH-1..0]

    1

    0

    data[LPM_WIDTH-1..0]

    Z

    1

    1

    data[LPM_WIDTH-1..0]

    data[LPM_WIDTH-1..0]