adv7314 Analog Devices, Inc., adv7314 Datasheet - Page 47

• Manufacturer Part Number: adv7314
• Description: Multiformat 216 Mhz Video Encoder With Six Nsv 14-bit Dacs
• Manufacturer: Analog Devices, Inc.

SD Hue Adjust Value
[Subaddress 60h]
The hue adjust value is used to adjust the hue on the composite
and chroma outputs.
These eight bits represent the value required to vary the hue of
the video data, i.e., the variance in phase of the subcarrier during
active video with respect to the phase of the subcarrier during
the color burst. The ADV7314 provides a range of ± 22.5H incre-
ments of 0.17578125H. For normal operation (zero adjustment),
this register is set to 80h. FFh and 00h represent the upper and
lower limit (respectively) of adjustment attainable.
(Hue Adjust) [H] = 0.17578125H
hue adjust value.
*Rounded to the nearest integer.
To adjust the hue by –4H, write 69h to the hue adjust value
register:
*Rounded to the nearest integer.
SD Brightness Control
[Subaddress 61h]
The brightness is controlled by adding a programmable setup
level onto the scaled Y data. This brightness level may be added
onto the scaled Y data. For NTSC with pedestal, the setup can
vary from 0 IRE to 22.5 IRE. For NTSC without pedestal and
PAL, the setup can vary from –7.5 IRE to +15 IRE.
The brightness control register is an 8-bit register. Seven bits of
this 8-bit register are used to control the brightness level. This
brightness level can be a positive or negative value. For example:
Standard: NTSC with pedestal.
To add +20 IRE brightness level, write 28h to Address 61h, SD
brightness.
REV. 0
[
[
[
SD BrightnessValue H
IREValue
20 2 015631
Ê
Á
Ë
Ê
Á
Ë
¥
0 17578125
0 17578125
.
.
.
-
4
4
¥
2 015631
.
]
H
ˆ
˜ +
¯
ˆ
˜ +
¯
=
100 IRE
128 151
128 105
[
0 IRE
]
40 31262
]
H
(HCRd –128), for positive
=
=
.
=
=
NTSC WITHOUT PEDESTAL
Figure 38. Examples for Brightness Control Values
VALUE ADDED
d
d
NO SETUP
*
*
]
H
=
=
97
69
=
28
h
h
H
POSITIVE SETUP
VALUE ADDED
–47–
Standard: PAL.
To add –7 IRE brightness level, write 72h to Address 61h, SD
brightness.
Setup
Level In
NTSC with
Pedestal
22.5 IRE
15 IRE
7.5 IRE
0 IRE
*Values in the range from 3Fh to 44h might result in an invalid output signal.
SD Brightness Detect
[Subaddress 7Ah]
The ADV7314 allows monitoring of the brightness level of the
incoming video data. Brightness detect is a read-only register.
Double Buffering
[Subaddress 13h, Bit 7; Subaddress 48h, Bit 2]
Double buffered registers are updated once per field on the
falling edge of the VSYNC signal. Double buffering improves
the overall performance since modifications to register settings
will not be made during active video, but take effect on the start
of the active video.
Double buffering can be activated on the following HD registers:
HD Gamma A and Gamma B curves and HD CGMS registers.
Double buffering can be activated on the following SD regis-
ters: SD Gamma A and Gamma B curves, SD Y scale, SD U
scale, SD V scale, SD brightness, SD closed captioning, and
SD Macrovision Bits 5–0.
[
[
[
7 2 015631
0001110
IRE Value
¥
NEGATIVE SETUP
VALUE ADDED
.
Table X. Brightness Control Values*
Setup
Level In
NTSC No
Pedestal
15 IRE
7.5 IRE
0 IRE
–7.5 IRE
]
int
¥
o twos complement
]
2 015631
=
.
[
14 109417
.
+7.5 IRE
–7.5 IRE
]
Setup
Level In
PAL
15 IRE
7.5 IRE
0 IRE
–7.5 IRE
=
]
=
=
0001110
[
1110010
ADV7314
b
SD
Brightness
1Eh
0Fh
00h
71h
]
B
=
72
h