Analog Devices Advantiv ADV7611 Hardware User's Manual page 43

Hardware User Guide
HDMI SYNCHRONIZATION PARAMETERS
The ADV7611 contains the logic required to measure the details of the incoming video resolution. The HDMI synchronization
parameters readback registers from the HDMI Map can be used, in addition to the STDI registers from the CP (refer to the Standard
Detection and Identification section), to estimate the video resolution of the incoming HDMI stream.
Notes
•
The synchronization parameters are valid if the part is configured in HDMI mode via PRIM_MODE[3:0].
•
The HDMI synchronization filter readback parameters are valid even while the part free runs (refer to the Free Run Mode section)
on the condition that the measurement filters have locked.
Horizontal Filter and Measurements
The HDMI horizontal filter performs measurements on the DE and HSync 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 Horizontal Filter Measurements
The HDMI horizontal filter performs the measurements described in this section on the HDMI port selected by
HDMI_PORT_SELECT[2:0].
Notes
•
The horizontal measurements are valid only if
•
The HDMI horizontal filter is used solely to measure the horizontal synchronization signals decoded from the HDMI stream. The
HDMI horizontal 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.
•
The unit for horizontal filter measurement is a pixel, that is, the actual element of the picture content encapsulated in the HDMI/DVI
stream which the ADV7611 processes. A pixel has a duration T
measurements.
T = T × DEEP_COLOR_RATIO × (PIXEL_REPETITION + 1)
Pixel FTMDS
where:
T is the TMDS frequency.
FTMDS
DEEP_COLOR_RATIO = 1 for 24-bit deep color.
DEEP_COLOR_RATIO = 5/4 for 30-bit deep color.
DEEP_COLOR_RATIO = 3/2 for 36-bit deep color.
DEEP_COLOR_RATIO = 2 for 48-bit deep color.
PIXEL_REPETITION is the number of repeated pixels in the input HDMI stream.
DE_REGEN_FILTER_LOCKED , Addr 68 (HDMI), Address 0x07[5] (Read Only)
DE regeneration filter lock status. Indicates that the DE regeneration section has locked to the received DE and horizontal
synchronization parameter measurements are valid for readback.
Function
DE_REGEN_FILTER_LOCKED
0 (default)
1
DE_REGEN_LCK_RAW , IO, Address 0x6A[0] (Read Only)
Raw status of the DE regeneration lock signal.
Function
DE_REGEN_LCK_RAW
0 (default)
1
DE_REGEN_LCK_RAW
Description
DE regeneration not locked
DE regeneration locked to incoming DE
Description
DE regeneration block has not been locked.
DE regeneration block has been locked to the incoming DE signal.
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is set to 1.
, which is provided in Equation 2, unit time of horizontal filter
PIXEL
(2)
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