Analog Devices ADV7610 Hardware User's Manual page 119

Hardware User Guide
FIELD1 – FIELD2 ≤ THRESHOLD?
FIELD 1
ACTIVE VIDEO ACTIVE VIDEO
VSYNC1
VSYNC1 – VSYNC2 ≤ THRESHOLD?
Once the STDI locks to the incoming video, the STDI registers the latest field length/VSync length as latched data (absolute field length: F,
absolute VSync length: V). The STDI keeps monitoring and comparing FIELD/VSync lengths with the respective absolute length (F, V)
once vertically locked. The STDI vertically unlocks if four consecutive FIELD or VSync lengths are greater than the respective threshold.
FIELD1
ACTIVE VIDEO ACTIVE VIDEO
VSYNC1
CH1_BL[13:0], Addr 44 (CP), Address 0xB1[5:0]; Address 0xB2[7:0] (Read Only)
A readback for the block length for Sync Channel 1. Number of crystal cycle cycles in a block of eight lines of incoming video. This
readback is valid if CH1_STDI_DVALID is high.
Function
CH1_BL[13:0]
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CH1_LCVS[4:0], Addr 44 (CP), Address 0xB3[7:3] (Read Only)
A readback for the Sync Channel 1 line count in a VSync.
Number of lines in a VSync period measured on Sync Channel 1. The readback from this field is valid if CH1_STDI_DVALID is high.
Function
CH1_LCVS[4:0]
xxxxx
CH1_LCF[11:0], Addr 44 (CP), Address 0xA3[3:0]; Address 0xA4[7:0] (Read Only)
A readback for the Sync Channel 1 line count in a field.
Number of lines between two VSyncs measured on Sync Channel 1. The readback from this field is valid if CH1_STDI_DVALID is high.
Function
CH1_LCF[11:0]
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FIELD2 – FIELD3 ≤ THRESHOLD?
FIELD3 – FIELD4 ≤ THRESHOLD?
FIELD 2 FIELD 3
ACTIVE VIDEO
VSYNC2
VSYNC2 – VSYNC3 ≤ THRESHOLD?
Figure 43. STDI Vertical Locking Operation
FIELD2 FIELD3
ACTIVE VIDEO
VSYNC2
Figure 44. STDI VSync Monitoring Operation
Description
Readback value
Description
Readback value
Description
Readback value
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FIELD4 – FIELD5 ≤ THRESHOLD?
FIELD 4
ACTIVE VIDEO
VSYNC3 VSYNC4
VSYNC3 – VSYNC4 ≤ THRESHOLD?
VSYNC5 – VSYNC4 ≤ THRESHOLD?
F
FIELD5 – F ≤ THRESHOLD? FIELD6 – F ≤ THRESHOLD?
LATCHED FIELD LENGTH
FIELD4
ACTIVE VIDEO
VSYNC3 VSYNC4
F
LATCHED VSYNC LENGTH
FIELD 5 FIELD 6
ACTIVE VIDEO ACTIVE VIDEO
VSYNC5
FIELD5 FIELD6
ACTIVE VIDEO ACTIVE VIDEO
VSYNC5
VSYNC5 – V ≤ THRESHOLD?
UG-438