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Function
rb_c2[12:0]
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rb_c3[12:0], Addr 44 (CP), Address 0x1B[6:0]; Address 0x1C[7:2] (Read Only)
This readback displays the CSC coefficient C3 modified by the video adjustment block.
Function
rb_c3[12:0]
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rb_c4[12:0], Addr 44 (CP), Address 0x19[4:0]; Address 0x1A[7:0] (Read Only)
This readback displays the CSC coefficient C4 modified by the video adjustment block.
Function
rb_c4[12:0]
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8.3.4.1 CSC Manual Programming
The equations performed by the CP CSC are as follows:
A
[ 1
12
=
∗
Out
_
A
In
_
A
4096
B
[ 1
12
=
∗
Out
_
B
In
_
A
4096
C
[ 1
12
=
∗
Out
_
C
In
_
A
4096
As can be seen from
Equation 6, Equation 7
primary inputs. The values of A4, B4, and C4 are added as offsets.
which the coefficients exceed the standard range of [-4095/4096 .. 4095/4096]. The overall range of the CSC is [0..1] for unipolar signals
(for example, Y, R, G, and B) and [-0.5..+0.5] for bipolar signals (for example, Pr and Pb).
Note: The bipolar signals must be offset to mid range, for example, 2048.
To arrive at programming values from typical formulas, the following steps are performed:
1.
Determine the dynamic range of the equation.
The dynamic range of the CSC is [0 ... 1] or [-0.5 ... +0.5]. Equations with a gain larger than 1 need to be scaled back. Errors in
the gain can be compensated for in the gain stages of the follow on blocks. Scale the equations, if necessary.
2.
Check the value of each coefficient. The coefficients can only be programmed in the range [-0.99 ... +0.99].
Rev. A May 2012
Description
Readback value
Description
Readback value
Description
Readback value
:
] 0
A
[ 2
12
:
] 0
+
∗
+
In
_
B
4096
:
] 0
B
[ 2
12
:
] 0
+
∗
+
In
_
B
4096
:
] 0
C
[ 2
12
:
] 0
+
∗
+
In
_
B
4096
and
Equation
A
[ 3
12
:
] 0
∗
+
In
_
C
A
[ 4
12
4096
Equation 6: CSC Channel A
B
[ 3
12
:
] 0
∗
+
In
_
C
B
[ 4
12
4096
Equation 7: CSC Channel B
C
[ 3
12
:
] 0
∗
+
In
_
C
C
[ 4
12
4096
Equation 8: CSC Channel C
8, the A1, A2, A3; B1, B2, B3; and C1, C2, C3 coefficients are used to scale the
csc_scale[1:0]
236
∗
CSC
_
scale
:
] 0
2
∗
CSC
_
scale
:
] 0
2
∗
CSC
_
scale
:
] 0
2
allows the user to implement conversion formulae in
ADV7850
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