Analog Devices Advantiv ADV7619 Hardware User's Manual page 55

Hardware User Guide
Vertical Filters and Measurements
The ADV7619 integrates a HDMI vertical filter which performs measurements on the VSync of the HDMI stream on the selected port.
The ADV7619 also performs vertical measurements on the background port as selected by BG_MEAS_PORT_SEL[2:0] .These
measurements are available in the HDMI map and can be used to determine the resolution of the incoming video data streams.
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 V_LOCKED_RAW is set to 1.
•
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.
FIELD0_TOTAL_HEIGHT[13:0] , Addr 68 (HDMI), Address 0x26[5:0]; Address 0x27[7:0] (Read Only)
Field 0 total height is a vertical synchronization measurement. This readback gives the total number of half lines in Field 0. This
measurement is valid only when the vertical filter has locked.
Function
FIELD0_TOTAL_HEIGHT[13:0]
xxxxxxxxxxxxxx
FIELD0_HEIGHT[12:0] , Addr 68 (HDMI), Address 0x09[4:0]; Address 0x0A[7:0] (Read Only)
Field 0 height is a vertical filter measurement. This readback gives the number of active lines in Field 0. This measurement is valid only
when the vertical filter has locked.
Function
FIELD0_HEIGHT[12:0]
xxxxxxxxxxxxx
FIELD0_VS_FRONT_PORCH[13:0] , Addr 68 (HDMI), Address 0x2A[5:0]; Address 0x2B[7:0] (Read Only)
Field 0 VSync front porch width is a vertical synchronization measurement. The unit of this measurement is half lines. This measurement
is valid only when the vertical filter has locked.
Function
FIELD0_VS_FRONT_PORCH[13:0]
xxxxxxxxxxxxxx
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
Description
The total number of half lines in Field 0 (divide readback by 2 to get number of lines)
Description
The number of active lines in Field 0
Description
The total number of half lines in the VSync front porch of Field 0 (divide readback by 2 to get
number of lines)
Rev. A | Page 55 of 204
UG-237