Analog Devices ADV7610 Hardware User's Manual page 43

Hardware User Guide
Horizontal Filter Locking Mechanism
The locking/unlocking mechanism of the HDMI horizontal filter is as follows:
•
The HDMI horizontal filter locks if the following two conditions are met:
•
The DE transitions occur at the exact same pixel count for eight consecutive video lines
•
The HSync transitions occur at the exact same pixel count for eight consecutive video lines
•
The HDMI horizontal filter unlocks if either of the two following conditions are met:
•
The DE transitions occur on different pixels count for 15 consecutive video lines
•
The HSync transitions occur on different pixels count for 15 consecutive video lines
Vertical Filters and Measurements
The ADV7610 integrates a HDMI vertical filter, which performs measurements on the VSync of the HDMI stream on the selected port.
These measurements are available in the HDMI map and can be used to determine the resolution of the incoming video data stream.
Primary Port Vertical Filter Measurements
The HDMI vertical filter performs the measurements on the HDMI port selected by HDMI_PORT_SELECT[2:0].
The Field 0 measurements are adequate to determine the standard of incoming progressive modes. A combination of Field 0 and field 1
measurements should be used to determine the standard of interlaced modes.
Notes
•
The vertical measurements are valid only if
•
The HDMI vertical filter is used solely to measure the vertical synchronization signals decoded from the HDMI stream. This filter is
not in the main path of the synchronization processed by the part and does not delay the overall HDMI data into video data out
latency.
VERT_FILTER_LOCKED, Addr 68 (HDMI), Address 0x07[7] (Read Only)
Vertical filter lock status. Indicates whether the vertical filter is locked and vertical synchronization parameter measurements are valid for
readback.
Function
VERT_FILTER_LOCKED
0
1
V_LOCKED_RAW, IO, Address 0x6A[1] (Read Only)
Raw status of the vertical sync filter locked signal.
Function
V_LOCKED_RAW
0
1
Note: Field 0 measurements are used to determine the video modes that are progressive.
A
DATA
ENABLE
D
C
E
HSYNC
NOTE:
A TOTAL NUMBER OF PIXELS PER LINE
B ACTIVE NUMBER OF PIXELS PER LINE
C HSYNC FRONT PORCH WIDTH IN PIXEL UNIT
D HSYNC WIDTH IN PIXEL UNIT
E HSYNC BACK PORCH WIDTH IN PIXEL UNIT
Figure 8. Horizontal Timing Parameters
V_LOCKED_RAW
Description
Vertical filter has not locked.
Vertical filter has locked.
Description
Vertical sync filter has not locked and vertical sync parameters are not valid
Vertical sync filter has locked and vertical sync parameters are valid
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B
is set to 1.
UG-438