DS730 Datasheet, PDF (4/46 Pages) Xilinx, Inc – LogiCORE IP Video Direct

LogiCORE IP Video Direct Memory Access v1.1
• Bus Interface: The Video DMA is generated with one of two data interfaces
• VDMA: CORE Generator will generate the Video DMA with a VDMA FIFO data interface.
• XSVI: CORE Generator will generate the Video DMA with an XSVI streaming data interface.
• DMA Options
• DMA Mode: The Video DMA can be configured for three different modes of operation. The allowable
selections are:
- Write_Only Mode: The Video DMA will perform only write operations.
- Read_Only Mode: The Video DMA will perform only read operations.
- Read/Write Mode: The Video DMA will perform both read and write operations.
• Frame Stores: The Frame Stores parameter allows the Video DMA to be configured with the specified
number of Read or Write Address Registers. The permitted values are 1 – 16. Typically this is the number
of frame buffers to be created in external memory.
• Data Width: The Data Width parameter specifies the width of the data buses of the Video DMA data read
and write ports. The permitted values are 8, 16, 32 and 64.
• Allow Non-Aligned Transfers: When selected, this parameter specifies that additional logic will be
included in the Video DMA to perform horizontal cropping/padding of VFBC read or writes. Horizontal
cropping/padding is necessary if any transfers will not be properly aligned with the 128-byte boundaries
required by the VFBC. This includes memory addressing that does not align to the 128-byte boundaries or
to horizontal data lengths that are not 128-byte multiples.
• Use Frame Sync: When selected, this parameter specifies that the Video DMA will synchronize all frame
operations with the falling edge of the fsync signal. The fsync signal is commonly driven by the Video
Timing Controller LogiCORE IP or the vsync signal of a streaming video bus.
• Auto-Flush FIFOs: When selected, this parameter specifies that all VFBC FIFOs should be Flushed and
Reset before each transfer. This option is available only if “Use Frame Sync” is selected.
DS730 September 21, 2010
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Product Specification