Analog Devices ADV8003, Руководство по оборудованию

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ADV8003 Hardware Manual
Rev. B, August 2013 188
When crop or album mode is enabled, frame latency will be different from that listed in Table 33 . In this case, the user can use the
following controls to measure frame latency: svsp_rb_frame_latency[2:0] and svsp_rb_hsync_latency[11:0] are read only registers. Their
values are real-time frame and HSync latency between input and output video.
Frame latency may vary within a range; the
svsp_rb_max_latency[14:0] readback register indicates the maximum frame latency, while
svsp_rb_min_latency[14:0] indicates the minimum frame latency. If svsp_frc_latency_measure_en is set to 0, svsp_rb_max_latency[14:0]
and svsp_rb_min_latency[14:0] are cleared. If asserting svsp_frc_latency_measure_en , SVSP monitors values in
svsp_rb_max_latency[14:0] and svsp_rb_min_latency[14:0] and then records the maximum and minimum values of them in the
svsp_rb_max_latency[14:0] and svsp_rb_min_latency[14:0] registers which are both 15 bits wide. The highest three bits are the frame
latency and the lower 12 bits are the HSync latency. Users should note that it will take several seconds for the SVSP to find the maximum
and minimum frame/HSync latency.
In a normal case (not game mode), the SVSP’s input video and output video latency is consistent.
svsp_frc_latency_measure_en , Secondary VSP Map, Address 0xE662[2]
This bit is used to enable measuring frame/HSync latency.
Function
svsp_frc_latency_meas
ure_en Description
0  Disable
1 Enable
svsp_rb_frame_latency[2:0] , Secondary VSP Map, Address 0xE6F2[7:5] (Read Only)
This signal is used to readback the realtime frame latency.
Function
svsp_rb_frame_latency[
2:0] Description
0xXXX Frame latency
svsp_rb_hsync_latency[11:0] , Secondary VSP Map, Address 0xE6F3[7:0]; Address 0xE6F4[7:4] (Read Only)
This signal is used to readback the realtime HSync latency.
Function
svsp_rb_hsync_latency[
11:0] Description
0xXXX HSync latency
svsp_rb_max_latency[14:0] , Secondary VSP Map, Address 0xE6F5[7:0]; Address 0xE6F6[7:1] (Read Only)
This signal is used to read back the maximum frame/HSync latency. The upper three bits are VSync latency, the lower twelve bits are
HSync latency.
Function
svsp_rb_max_latency[1
4:0] Description
0xXXX Maximum of frame latency