Altera DisplayPort MegaCore Function - Manual (Page 34)

Bit Name Bit Position Description
SP Byte 3, bit 7 Sample present bit:
1: Sample information is present and can be processed.
0: Sample information is not present.
All one-sample channels, used or unused, must have the same
sample present bit value.
This bit is useful for situations in which 2-channel audio is
transported over a 4-lane main link. In this operation, main link
lanes 2 and 3 may or may not have the audio sample data. This bit
indicates whether the audio sample is present or not.
The source automatically generates the Audio InfoFrame and fills it with only information about the
number of channels used. Use the audio channel status to provide any information about the audio
stream needed by downstream devices.
MSA Interface
For applications that use a known video source signal, you can remove the added resource of video
measurement. In this scenario, the DisplayPort source uses the MSA values presented on the
txN_msa_conduit signal bundle shown below:
wire [191:0] txN_msa_conduit = {Mvid[23:0], Nvid[23:0], Htotal[15:0], Vtotal[15:0],
HSP, HSW[14:0], Hstart[15:0],
Vstart[15:0], VSP, VSW[14:0], Hwidth[15:0], Vheight[15:0], MISC0[7:0], MISC1[7:0]};
Table 4-12: txN_msa_conduit Port Signals
Bit Signal Comments
191:168 Mvid[23:0]
Mvid for the main video stream. Used for stream clock recovery
from link symbol clock.
167:144 Nvid[23:0] Nvid for the main video stream. Used for stream clock recovery
from link symbol clock.
143:128 Htotal[15:0]
Horizontal total of received video stream in pixels
127:112 Vtotal[15:0]
Vertical total of received video stream in lines
111 HSP
H-sync polarity 0 = Active high, 1 = Active low
110:96 HSW[14:0]
H-sync width in pixels
95:80 Hstart[15:0]
Horizontal active start from H-sync start in pixels (H-sync width
+ Horizontal back porch)
4-18 MSA Interface
UG-01131
2015.05.04
Altera Corporation DisplayPort Source
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