Analog Devices Advantiv ADV7619 Hardware User's Manual page 123

Hardware User Guide
USE VALUE FROM I
OFFSET_A/B/C[9:0] DIRECTLY
CHANNEL
For RGB type output data, the three offset values should be programmed to 0 or 64 (desired code output for black video). For YPbPr type
output data, A_OFFSET[9:0] should be set to 64 (desired code for black); B_OFFSET[9:0] and C_OFFSET[9:0] (for Pr and Pb) are
typically set to 512 (midrange).
Notes
•
Adding an excessive offset onto the data will result in clipping of the signal.
•
The offset value can only be positive; it is an unsigned number.
•
ADV7619 employs sequencers for the offset values that prohibit intermediate wrong values to be applied.
•
2
The I C sequencer treats the three offset values as separate entities. To update all three offset values, a single sweep of I
the CP map, Register 0x77, Register 0x78, Register 0x79, and Register 0x7A is sufficient.
A_OFFSET[9:0] , Addr 44 (CP), Address 0x77[5:0]; Address 0x78[7:4]
A control to set the manual offset for Channel A.
This field stores an unsigned value. To change A_OFFSET[9:0], Register Address 0x77 and Register Address 0x78 must be written to in
2
this order with no I C access in between.
Function
A_OFFSET[9:0]
0x3FF (default)
Any other value
Note that to change the A_OFFSET[9:0] value, Register 0x77 and Register 0x78 must be written to in this order with no other I
in between.
B_OFFSET[9:0] , Addr 44 (CP), Address 0x78[3:0]; Address 0x79[7:2]
A control to set the manual offset for Channel B.
This field stores an unsigned value. To change B_OFFSET[9:0], Register Addresses 0x78 and Register Address 0x79 must be written to in
2
this order with no I C access in between.
Function
B_OFFSET[9:0]
0x3FF (default)
Any other value
Note : To change the A_OFFSET[9:0] value, register 0x77 and 0x78 must be written to in this order with no other I
NO
2
I C REGISTER VALUE
OFFSET_A/B/C[9:0] ==
C REGISTER
2
RGB_OUT = 1
OP_656_RANGE = 1
A 64dec
B
64dec
64dec
C
Figure 42. Channel A, Channel B, and Channel C Automatic Value Selection
Description
Auto offset to Channel A
Channel A offset
Description
Auto offset to Channel B
Channel B offset
0x3FF
OFFSET
OP_656_RANGE = 0 OP_656_RANGE = 1
0dec 64dec
0dec 512dec
0dec 512dec
Rev. A | Page 123 of 204
YES
RGB_OUT = 0
OP_656_RANGE = 0
0dec
512dec
512dec
2
C access in between.
UG-237
2
C writes to
2
C access