Shim Constraint - 2023.1 English

AI Engine Kernel and Graph Programming Guide (UG1079)

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2023.1 English
This constrains a node (PLIO or GMIO) to a specific AI Engine array interface, which is specified by column and channel. The column and channel are zero based. The channel is optional, and if omitted, the compiler selects the optimal channel.
Note: PLIOs cannot be placed in every column.  The availability of columns is device dependent.  For example, columns 0-5 cannot be used for PLIO for the xcvc1902-vsva2197-2MP-e-S device. Refer to the relevant device data sheet for more information.


"shim": {
  "column": integer,
  "channel": integer (optional)


  "NodeConstraints": {
    "plioOut1": {
      "shim": {
        "column": 0,
        "channel": 1
    "plioOut2": {
      "shim": {
        "column": 1