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Video Scaler v4.0 User Guide
www.xilinx.com
27
UG805 March 1, 2011
Data Source: Memory
Data Source: Memory
This mode is primarily intended for use with a memory controller with rectangular access
capability such as the VFBC port on the MPMC. The VFBC port must be configured to
provide the amount of data that the scaler is expecting for each frame. The port must
contain sufficient buffering for at least one horizontal line of the input video rectangle.
When this video interface mode has been selected in CORE Generator,
hblank_in
,
vblank_in
, and
active_video_in
timing signals are not required. Also, the video data
must be fed into the scaler core via the
rd_data
port instead of the
video_data_in
port.
The
rd_almost_empty
signal must be asserted when the port has less than one line
available in the buffer.
When
rd_almost_empty
is low and the scaler is ready to accept a new line of input data,
it asserts the
rd_re
signal high. This signal will remain high for the duration of one line
period (determined by
aperture_start_pixel
and
aperture_end_pixel
). The first
(left-most) valid data pixel must be driven onto the
rd_data
port one clock cycle after
rd_re
has been asserted. See
Figure 4-4
.
It is important for the scaler core to have a concept of frame synchronization so that top-
edge filtering may be performed cleanly. For this purpose, you must also supply a vertical
synchronization pulse
vsync_in
once per frame, before the input of the top line. Only the
rising edge of
vsync_in
is used internally. It should be provided in the
video_in_clk
domain.
In this mode, cropping is not possible within the scaler itself as in Live Video mode.
aperture_start_pixel
and
aperture_start_line
must be set to 0. Cropping can
be achieved using memory offsets. The first pixel and line provided to the scaler will
always be included in the horizontal and vertical apertures.
X-Ref Target - Figure 4-4
Figure 4-4:
Interface Timing for Memory Source Mode
Содержание LogiCORE IP
Страница 1: ...LogiCORE IP Video Scaler v4 0 User Guide UG805 March 1 2011...
Страница 6: ...Video Scaler v4 0 User Guide www xilinx com UG805 March 1 2011...
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...