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# Code Location

When designing a system there is a choice as to which hardware resources to use for each interface. In a multi-tile system the codebase needs to be informed as to which tiles to use for these hardware resources and associated code.

A series of defines are used to allow the programmer to easily move code between tiles. Arguably the most important of these are `XUA_AUDIO_IO_TILE_NUM` and `XUA_XUD_TILE_NUM`. Table 7 shows a full listing of these `TILE` defines.

Note

If not explicitly defined by user, tile numbers will be derived from the application XN file `PORT` defines. In general this is the recommended approach.

Table 7 Tile defines
Define | Description | Default
--- | --- | ---
`XUA_AUDIO_IO_TILE_NUM` | Tile on which I2S/TDM, ADAT Rx, S/PDIF Rx & mixer resides | Derived from related port defines in the application XN file
`XUA_XUD_TILE_NUM` | Tile on which USB resides, including buffering for all USB interfaces/endppoints | `0`
`XUA_MIDI_TILE_NUM` | Tile on which MIDI resides | Derived from MIDI related port defines in the application XN file
`XUA_SPDIF_TX_TILE_NUM` | Tile on which S/PDIF Tx resides | Derived from PORT_SPDIF_OUT port define in the application XN file
`XUA_MIC_PDM_TILE_NUM` | Tile on which PDM microphones resides | Derived from Mic related port defines in the application XN file
`XUA_PLL_REF_TILE_NUM` | Tile on which reference signal to CS2100 resides | Derived from PORT_PLL_REF port define in the application XN file

Note

It should be ensured that the relevant port defines in the application XN file match the code location defines