Background Port Horizontal Filter Measurements; Figure 58: Horizontal Timing Parameters - Analog Devices ADV7850 Hardware Manual

Function
hsync_pulse_width[12:
0]
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hsync_back_porch[12:0], Addr 68 (HDMI), Address 0x24[4:0]; Address 0x25[7:0] (Read Only)
This readback displays the total number of pixels in the back porch. The HSync back porch width is a horizontal synchronization
measurement. The unit of this measurement is unique pixels. This measurement is valid only when the DE regeneration filter has
locked.
Function
hsync_back_porch[12:0
]
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dvi_hsync_polarity, Addr 68 (HDMI), Address 0x05[5] (Read Only)
This readback indicates the polarity of the HSync encoded in the input stream.
Function
dvi_hsync_polarity
0 
1
Data
Enable
HSYNC
a Total number of pixels per line
b Active number of pixels per line
c HSync front porch width in pixel unit

Background Port Horizontal Filter Measurements

7.24.3
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 set to 1 for background horizontal and vertical measurements to be valid.
bg_param_lock, Addr 68 (HDMI), Address 0xEA[1] (Read Only)
This readback indicates if vertical and horizontal parameters were locked during a background measurement.
Rev. A May 2012
Description
Total number of pixels in HSync pulse
Description
Total number of pixels in back porch
Description
HSync active low
HSync active high
d
c
e

Figure 58: Horizontal Timing Parameters

a
b
d HSync width in pixel unit
e HSync back porch width in pixel unit
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ADV7850