1. Presentation of the tool
The SLIMbus Audio Bridge makes the link between SLIMbus and the SPDIF / I2S legacy
audio interfaces.
The main purpose of the bridge is to allow easy tests of audio capabilities of a SLIMbus
component with traditional audio analyzers (Audio Precision, PrismSound,
Rhode&Swartz ...).
The bridge is also a fully featured and compliant SLIMbus component. It can be used to
test other SLIMbus components (especially SLIMbus Manager or other audio
components).
Features:
- 4 or 8 data ports (depending on the model)
- 2 or 4 I2S input streams on HD15 connector (VGA type) sharing the same bit clock
(BCLK) and word clock (LRCLK)
- 2 or 4 I2S output streams on HD15 connector (VGA type) sharing the same bit clock
(BCLK) and word clock (LRCLK)
- SPDIF input and output
- Analogue output (stereo)
- Data loop back function
- Very flexible clock management
The data ports must operate by pair and can be source or sink. Additionally, all sink ports
must use the same Presence Rate. Similarly, all the source must use the same presence
rate. Note that the channel rates must not necessarily be identical. The transport
protocols can also differ. Only the Presence Rate does matter.
Port
As source, mapped to
As sink, mapped to
0
S/PDIF stream
I2S Input stream 1
I2S Output stream 1
1
S/PDIF stream
I2S Input stream 1
I2S Output stream 1
2
I2S Input stream 2
I2S Output stream 2
3
I2S Input stream 2
I2S Output stream 2
4
I2S Input stream 3
I2S Output stream 3
5
I2S Input stream 3
I2S Output stream 3
6
I2S Input stream 4
I2S Output stream 4
7
I2S Input stream 4
I2S Output stream 4
The S/PDIF output and the analogue output can use the I2S Output stream 1 to 4 (user
selectable).
The following figure shows a high level diagram of the bridge architecture. The SLIMbus
interface specificities are not shown here and the SLIMbus IP is treated as a black box.
SLIMbus Audio Bridge User Manual V0,9 - Draft Version
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