Analog Devices Advantiv ADV7619 Hardware User's Manual page 54

UG-237
Background Port Horizontal Filter Measurements
The HDMI horizontal filter performs the measurements described in this section on the HDMI port selected by
BG_MEAS_PORT_SEL[2:0] .
Note: BG_PARAM_LOCK must be high for background horiztonal and vertical measurements to be valid.
BG_PARAM_LOCK , Addr 68 (HDMI), Address 0xEA[1] (Read Only)
A flag to indicate that vertical and horizontal parameters have been locked during a background measurement.
Function
BG_PARAM_LOCK
0 (default)
1
BG_TOTAL_LINE_WIDTH[13:0] , Addr 68 (HDMI), Address 0xE4[5:0]; Address 0xE5[7:0] (Read Only)
Background port total line width, a horizontal synchronization measurement for the background HDMI Port determined by
BG_MEAS_PORT_SEL[2:0] . The value represents the total number of pixels in a line and is updated when a update request is made
via the BG_MEAS_REQ control bit. This measurement is only valid when BG_PARAM_LOCK is set to 1.
Function
BG_TOTAL_LINE_WIDTH[13:0]
xxxxxxxxxxxxx
BG_LINE_WIDTH[12:0] , Addr 68 (HDMI), Address 0xE2[4:0]; Address 0xE3[7:0] (Read Only)
Background port line width, a horizontal synchronization measurement for the background HDMI Port determined by
BG_MEAS_PORT_SEL[2:0].
via the BG_MEAS_REQ control bit.
Function
BG_LINE_WIDTH[12:0]
0000000000000 (default)
xxxxxxxxxxxxx
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
DATA
ENABLE
D
C
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 13. Horizontal Timing Parameters
Description
Horizontal and Vertical were not locked when measurement for select background HDMI port were taken.
Horizontal and Vertical were locked when measurement for select background HDMI port were taken.
Description
The total number of pixels per line on the background measurement port
The value represents the number of active pixels in a line and is updated when a update request is made
Description
The number of active pixels per line on the background measurement port.
The number of active pixels per line on the background measurement port.
A
B
E
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