forked from PAWPAW-Mirror/lib_xua
47 lines
1.3 KiB
ReStructuredText
47 lines
1.3 KiB
ReStructuredText
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S/PDIF Transmit
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===============
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The codebase supports a single, stereo, S/PDIF transmitter. This can be output over 75 Ω coaxial or optical fibre.
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In order to provide S/PDIF transmit functionality ``lib_xua`` uses ``lib_spdif`` (https://www.github.com/xmos/lib_spdif).
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Basic configuration of S/PDIF transmit functionality is achieved with the defines in :ref:`opt_spdif_tx_defines`
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.. _opt_spdif_tx_defines:
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.. list-table:: S/PDIF tx defines
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:header-rows: 1
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:widths: 20 80 20
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* - Define
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- Description
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- Default
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* - ``XUA_SPDIF_TX_EN``
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- Enable S/PDIF transmit
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- ``0`` (Disabled)
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* - ``SPDIF_TX_INDEX``
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- Output channel offset to use for S/PDIF transmit
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- ``0``
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In addition, the developer may choose which tile the S/PDIF transmitter runs on, see :ref:`opt_spdif_tx_tile_defines`.
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.. _opt_spdif_tx_tile_defines:
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.. list-table:: S/PDIF tile define
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:header-rows: 1
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:widths: 20 80 20
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* - Define
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- Description
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- Default
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* - ``SPDIF_TX_TILE``
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- Tile that S/PDIF tx is connected to
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- ``AUDIO_IO_TILE``
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The codebase expects the S/PDIF transmit port to be defined in the application XN file as ``PORT_SPDIF_OUT``.
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This must be a 1-bit port, for example::
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<Port Location="XS1_PORT_1A" Name="PORT_SPDIF_OUT"/>
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