Analog Devices Advantiv ADV7604 Hardware Manual page 229

CLMP_A[11:0] Manual Clamp Value for Channel A , CP Map, Address 0x6C, [3:0]; Address
0x6D, [7:0]
Note : To change the CLMP_A[11:0] value, registers 0x6C and 0x6D must be written to in this order
2
with no other I C access in between.
Function
CLMP_A[11:0]
xxxx xxxx xxxx
0x000
To facilitate an external clamp loop for channels B and C, the internal clamp value determined by
the digital fine clamp block can be overridden by manual values programmed in the CP Map. Both
channels B and C are either in manual or automatic mode. There is no individual control for them.
The corresponding control values are CLMP_BC_MAN, CLMP_B[11:0], and CLMP_C[11:0].
CLMP_BC_MAN Enable Manual Clamping for Channels B and C , CP Map, Address 0x6C,
[6]
Function
CLMP_BC_MAN
0
1
CLMP_B[11:0] Manual Clamp Value for Channel B , CP Map, Address 0x6E, [7:0]; Address
0x6F, [7:4]
Note : To change the CLMP_B[11:0] value, registers 0x6E and 0x6F must be written to in this order
2
with no other I C access in between.
Function
CLMP_B[11:0]
xxxx xxxx xxxx
0x000
CLMP_C[11:0] Manual Clamp Value for Channel C , CP Map, Address 0x6F, [3:0]; Address
0x70, [7:0]
Note : To change the CLMP_C[11:0] value, registers 0x6F and 0x70 must be written to in this order
2
with no other I C access in between.
Function
CLMP_C[11:0]
xxxx xxxx xxxx
0x000
Rev. F August 2010
Description
12-bit value to be subtracted from the incoming video signal.
This value is only active if the CLMP_A_MAN bit is set.
Default value
Description
Ignores internal digital fine clamp loop result, instead uses
CLMP_B[11:0] for channel B and CLMP_C[11:0] for channel C
Uses the digital fine clamp value determined by the on-chip clamp loop
(CP)
Description
12-bit value to be subtracted from the incoming video signal. This value
is only active if the CLMP_BC_MAN bit is set.
Default value
Description
12-bit value to be subtracted from the incoming video signal. This value
is only active if the CLMP_BC_MAN bit is set.
Default value
229
ADV7604