S/PDIF transmit¶

The codebase supports a single, stereo, S/PDIF transmitter. This can be output over 75 Ω coaxial or optical fibre. In order to provide S/PDIF transmit functionality lib_xua uses lib_spdif.

Basic configuration of S/PDIF transmit functionality is achieved with the defines in Table 15.

Table 15 S/PDIF tx defines¶
Define	Description	Default
`XUA_SPDIF_TX_EN`	Enable S/PDIF transmit	`0` (Disabled)
`SPDIF_TX_INDEX`	Output channel offset to use for S/PDIF transmit	`0`

In addition, the developer may choose which tile the S/PDIF transmitter runs on, see Table 16

Table 16 S/PDIF tile define¶
Define	Description	Default
`SPDIF_TX_TILE`	Tile that S/PDIF tx is connected to	`AUDIO_IO_TILE`

The codebase expects the S/PDIF transmit port to be defined in the application XN file as PORT_SPDIF_OUT. This must be a 1-bit port, for example:

<Port Location="XS1_PORT_1A"  Name="PORT_SPDIF_OUT"/>