Buffers Constraint - Buffers Constraint - 2026.1 English - UG1603

This constrains a data buffer to a specific address on a specific tile. You can attach the data buffer to an input, output, or inout port of a kernel or param (for example, a lookup table). You can specify the address can be specified in one of three ways:

Column, row, and offset

The tile is specified by column and row. The offset address is relative to the tile, starting at zero with a maximum value of 65536 (64k).

Column, row, and bankId

the bank ID is relative to the tile and can take values 0, 1, 2, 3.

Offset

Can be between zero and 65536 (64k) and is relative to the tile allocated by the compiler.

Syntax

"buffers": [<address>, <(optional) address>]
<address> ::= <offset_address> | <bank_address> | <offset_address>
<tile_address> ::= {
  "column": integer,
  "row": integer,
  "offset": integer
}
<bank_address> ::= {
  "column": integer,
  "row": integer,
  "bankId": integer
}
<offset_address> ::= {
  "offset": integer
}

Example

{
  "PortConstraints": {
    "mygraph.k2.out[0]": {
      "buffers": [{
        "column": 2,
        "row": 2,
        "offset": 5632
      }, {
        "column": 2,
        "row": 2,
        "offset": 4608
      }]
    },
    "mygraph.k1.out[0]": {
      "buffers": [{
        "column": 2,
        "row": 3,
        "bankId": 2
      }, {
        "column": 2,
        "row": 3,
        "bankId": 3
      }]
    },
    "mygraph.p1": {
      "buffers": [{
        "offset": 512
      }]
    }
  }
}