Video Scaler v4.0 User Guide
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UG805 March 1, 2011
Chapter 6
Control Interface
There are three control interface options available in CORE Generator™ software: EDK
pCore, GPP or Constant. The interface types differ primarily in the method of delivery of
the user-defined control values and filter coefficients. These values are listed in the video
scaler data sheet
DS840
in Table 2, under “Dynamic Control Register Interface.”
Control Values
There follows a brief description of the function of the control values.
In GPP mode and pCore mode, these values are provided as dynamic inputs, and may be
changed during runtime – the user inputs become active once per frame after completion
of an output frame, using an internal active value capture register.
For the pCore version of the core, CORE Generator software provides the GPP core placed
in a wrapper which allows you to parameterize the scaler core in EDK. The ports are
driven by registers that sit on the AXI4-Lite. The address is decoded in the wrapper. A
MicroBlaze™ processor software driver is provided in source-code form to drive these
ports. Typical usage of the pCore is shown in
Figure 6-1
.
•
aperture_start_pixel
,
aperture_end_pixel
,
aperture_start_line
,
aperture_end_line
These parameters define the size and location of the input rectangle. They are
explained in detail in
Chapter 7, “Scaler Aperture.”
•
output_h_size
,
output_v_size
These two parameters define the size of the output rectangle. They do not determine
anything about the target video format. You must determine what do with the scaled
rectangle that emerges from the scaler core.
•
hsf
,
vsf
These are the horizontal and vertical shrink-factors that must be supplied the user.
They should be supplied as integers, and can typically be calculated as follows:
and
)
2
*
]
1
_
_
_
_
_
_
([
20
size
h
output
pixel
start
aperture
pixel
end
aperture
round
hsf
)
2
*
]
1
_
_
_
_
_
_
([
20
size
v
output
line
start
aperture
line
end
aperture
round
vsf
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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...
