When one of the data ports is configured as a sink, the first line will show which of the 4
I2S streams that is used by the analogue output and the SPDIF output.
----->----->SB>SDO1
----->----->SB>SDO2
----->----->SB>SDO3
----->----->SB>SDO4
If both the source and sink ports are configured an are operational, the line will show the
complete signal path. For instance:
SPDIF>ASRC20>SB>SDO2
The second and third lines are showing the port status (connected as source or
connected as sink) and the presence rate of the sink ports (IPR) and the source ports
(OPR).
When a port is not configured, its status is shown with a “
-
”. When a port is configured as
sink and a valid reconfiguration defined the channel structure and content, its status is
shown with a “
I
”. When a port is configured as source and a valid reconfiguration defined
the channel structure and content, its status is shown with a “
O
”.
The input and output presence rate are also shown when applicable. If for any reason a
mismatch was detected in the presence rate of all the sink ports or all the source port, the
display will show “
ERROR
” instead of a presence rate value.
The following examples shows 4 configured ports. Ports 1 and 2 are configured as source
ports (they output data on SLIMbus) and they have an output presence rate (OPR) equal
to 44,1kHz. Ports 3 and 4 are configured as sink port (they read data from SLIMbus) and
they have an input presence rate equal to 48kHz.
P01234567 OPR=44.1k
OOII---- IPR=48k
Note: When the audio master clock is generated by the PLL and the frequency is not
exactly what is displayed, the “
=
” sign becomes “
#
”. This could be the case when the root
frequency is 24 MHz and the presence rate is equal to 44.1kHz (other Root Frequency /
Presence Rate combination can lead to errors - see the Annex B for more information).
The master clock error is 126Hz, leading to a sample clock error of 0.49Hz. Not much but
worthwhile to mention...
P01234567 OPR#44.1k
OOII---- IPR=48k
The forth line of the page displays the bridge status. In case of no error, the display shows
the Framer status summary (Active/Inactive, Root Frequency and clock source).
Framer:Off,RF=1
Framer:Ena,RF=1(PLL)
Framer:Ena,RF=1(SMA)
SLIMbus Audio Bridge User Manual V0,9 - Draft Version
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