Altera Video and Image Processing Suite - Manual (Page 283)

Stage Description
Stage 3
• The video source BFM retrieves the data from its mailbox, recasts the data
back into a
c_av_st_video_data
video object, and begins translating it into
transactions for the Avalon-ST source BFM.
• To indicate that a video packet is being sent, there is one transaction per
pixel and an initial transaction with LSBs of 0×0 when using RGB24 data,
24-bit data buses, and parallel transmission.
Stage 4 The Avalon-ST source BFM turns each transaction into beats of data on the
Avalon-ST bus, which are received by the DUT.
Stage 5
• The DUT processes the data and presents the output data on the Avalon-ST
bus.
• The Avalon-ST Sink BFM receives these and triggers a signal_transaction_
received event for each beat.
Stage 6
• After the video sink BFM detects the
signal_transaction_received
event, the video sink BFM starts collecting transaction data from the BFM.
• When a start of packet (SOP) beat is detected, the type of the packet is
verified, and transaction data is pushed into a pixel object, which is in turn
pushed into a
video_data
object.
Stage 7
• An end of packet (EOP) is seen in the incoming transactions, the video sink
BFM casts the video data into a c_av_st_video_item object, and transfers the
data into its mailbox.
• The file writer then receives the video item.
Stage 8 The file writer recasts the video item to a video data packet, pops off the pixel,
and writes the data to the output file as binary data.
Constrained Random Test
The constrained random test is easily assembled using the class library.
UG-VIPSUITE
2015.05.04
Constrained Random Test A-15
Avalon-ST Video Verification IP Suite Altera Corporation
Send Feedback