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Video Scaler v4.0 User Guide
UG805 March 1, 2011
Appendix C:
System Level Design
•
The
On-Screen Display (OSD)
block aligns the data read from memory with the
timing signals and presents it as a standard-format video data stream. It also alpha-
blends multiple layers of information (e.g. text, other video data). See the
OSD Data
Sheet
for more information.
Control Buses
In this example, MicroBlaze is configured to use the PLB v4.6. The VDMAs sit on the PLB
bus directly. The Video Scaler, Timing Controller, and OSD use AXI4-Lite. The PLB-to-AXI
bridge facilitates the transition between PLB and AXI buses.
VDMA0 Configuration
VDMA0 is used uni-directionally, used for writing input data into the memory. Normally,
this should be configured as a write-only core (
C_DMA_TYPE
= 0).
However, currently, it is
configured as a bidirectional core in this case (
C_DMA_TYPE
= 2), to work around an issue in the
VDMA design - the read side of this core is not connected, except for the read-side clock.
The system operates using a Genlock mechanism. A rotational 5-frame buffer is defined in
the external memory. Using the Genlock bus
vdma_0_XIL_WD_MGENLOCK
, VDMA0
communicates to VDMA1 which of the five frame locations is being written, to avoid R/W
collisions.
VDMA0, in the MHS file text given below, is sourced from an engineering test-pattern
generator (not included in the MHS file below). This generates a VDMA write bus that
connects directly to the VDMA write port.
X-Ref Target - Figure C-1
Figure C-1:
Simplified System Diagram
Содержание LogiCORE IP
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Страница 14: ...14 www xilinx com Video Scaler v4 0 User Guide UG805 March 1 2011 Preface About This Guide...
Страница 18: ...18 www xilinx com Video Scaler v4 0 User Guide UG805 March 1 2011 Chapter 1 Introduction...
Страница 20: ...20 www xilinx com Video Scaler v4 0 User Guide UG805 March 1 2011 Chapter 2 Overview...
Страница 70: ...70 www xilinx com Video Scaler v4 0 User Guide UG805 March 1 2011 Chapter 9 Performance...
Страница 74: ...74 www xilinx com Video Scaler v4 0 User Guide UG805 March 1 2011 Appendix A Use Cases...
Страница 92: ...92 www xilinx com Video Scaler v4 0 User Guide UG805 March 1 2011 Appendix B Programmer Guide...