Altera DisplayPort MegaCore Function - Manual (Page 58)

Figure 5-10: rxN_audio Data Output
Audio Sample Period
rxN_audio_lpcm_data
rx_ss_clk
rxN_audio_valid
The captured audio infoframe is available on the audio port. The 5-byte port corresponds to the 5 bytes
used in the audio infoframe (refer to CEA-861-D). The audio infoframe describes the type of audio
content.
MSA Interface
The
rxN_msa_conduit
ports allow designs access to the MSA and VB-ID parameters on a top-level port.
The following table shows the 217-bit port bundle assignments. The prefixes
msa
and
vbid
denote
parameters from the MSA and Vertical Blank ID (VB-ID) packets, respectively.
The sink asserts bit
msa_valid
when all
msa_
signals are valid and deasserts during MSA update. The sink
assigns the MSA parameters to zero when it is not receiving valid video data.
The sink asserts the
msa_lock
bit when the MSA fields have been correctly formatted for the last 15 video
frames. Because
msa_lock
changes state only when
msa_valid
= 1, you can use its rising edge to strobe
new MSA values following an idle video period; for example, when the source changes video resolution.
You can use its deasserted state to invalidate received video data.
The sink asserts bit
vbid_strobe
for one clock cycle when it detects the VB-ID and all
vbid_
signals are
valid to be read.
Table 5-14: rxN_msa_conduit Port Signals
Bit Signal Comments
216 msa_lock 0 = MSA fields format error. 1 = MSA fields correctly
formatted.
215 vbid_strobe 0 = VB-ID fields invalid, 1 = VB-ID fields valid.
5-22 MSA Interface
UG-01131
2015.05.04
Altera Corporation DisplayPort Sink
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