01-31-2013 05:08 PM
Hello!Is it possible to "gluelessly" connect: - Clocked Video Input/Output IP ( from VIP suite ) - Altera SGDMA IP - Altera PCIe x 4 Hard IP between each other via Avalon-ST interface in Cyclone IV GX? I expect, that Avalon-ST interface will allow me to easily connect these IPs to make the following Qsys elements: 1). Clocked Video Input -> SGDMA IP-> PCIe Hard IP 2). PCIe Hard IP -> SGDMA IP-> Clocked Video Output Is it really easy and can be done without any "glue" logic? Maybe there is a reference design for these dataflows?
02-05-2013 03:21 PM
No, it is not.SGDMA streaming input/output does not know anything about Avalon-ST Video (VIP suite) protocol. Read this: http://www.altera.com/literature/ug/ug_vip.pdf See page 34: "The MegaCore functions in the Video and Image Processing Suite use the Avalon-ST Video protocol. The Avalon-ST Video protocol is a packet-oriented way to send video and control data over Avalon-ST connections. Using the Avalon-ST Video protocol allows the construction of image processing data paths which automatically configure to changes in the format of the video being processed. This minimizes the external control logic required to configure a video system." The Avalon-ST video protocol is a subset of the Avalon-ST protocol. There are various kinds of packets that are defined by the VIP protocol that you must handle appropriately. The SGDMA block knows nothing about how to parse these. That is why you need an Avalon-ST to Avalon-ST Video converter block if you want to connect anything from the VIP suite to the SGDMA.
02-05-2013 04:35 PM
02-06-2013 03:44 PM
From:http://www.altera.com/literature/manual/mnl_avalon_spec.pdf Page 35: "All Avalon-ST source and sink interfaces are not necessarily interoperable. However, if two interfaces provide compatible functions for the same application space, adapters are available to allow them to interoperate."
02-06-2013 04:07 PM
--- Quote Start --- From: http://www.altera.com/literature/manual/mnl_avalon_spec.pdf Page 35: "All Avalon-ST source and sink interfaces are not necessarily interoperable. However, if two interfaces provide compatible functions for the same application space, adapters are available to allow them to interoperate." --- Quote End --- Does that quote means, that inserted Avalon-ST Adapters ( in the attached screenshot ) are in fact "Avalon-ST Video -> Avalon-ST" converter blocks ?