adv7322 Analog Devices, Inc., adv7322 Datasheet - Page 47

• Manufacturer Part Number: adv7322
• Description: Multiformat 11-bit Hdtv Video Encoder
• Manufacturer: Analog Devices, Inc.

Preliminary Technical Data
VERTICAL BLANKING INTERVAL
The ADV7322 accepts input data that contains VBI data
[CGMS, WSS, VITS, and so on] in SD and HD modes.
For SMPTE 293M [525p] standards, VBI data can be inserted
on Lines 13 to 42 of each frame, or on Lines 6 to 43 for the
ITU-R BT.1358 [625p] standard.
For SD NTSC this data can be present on Lines 10 to 20, and in
PAL on Lines 7 to 22.
If VBI is disabled [Address 0x11, Bit 4 for HD; Address 0x43,
Bit 4 for SD], VBI data is not present at the output and the
entire VBI is blanked. These control bits are valid in all master
and slave modes.
In Slave Mode 0, if VBI is enabled, the blanking bit in the
EAV/SAV code is overwritten. It is possible to use VBI in this
timing mode as well.
In Slave Mode 1 or 2, the BLANK control bit must be set to
enabled [Address 0x4A, Bit 3] to allow VBI data to pass through
the ADV7322. Otherwise, the ADV7322 automatically blanks
the VBI to standard.
If CGMS is enabled and VBI is disabled, the CGMS data will
nevertheless be available at the output.
See Appendix 1—Copy Generation Management System.
Rev. PrA | Page 47 of 88
SUBCARRIER FREQUENCY REGISTERS
[Subaddresses 0x4C to 0x4F]
Four 8-bit registers are used to set up the subcarrier frequency.
The value of these registers is calculated using the equation
where the sum is rounded to the nearest integer.
For example, in NTSC mode
where:
Subcarrier Register Value = 0x21F07C1F
SD F
SD F
SD F
SD F
See the MPU Port Description section for more details on how
to access the subcarrier frequency registers.
Programming the F
The Subcarrier Register Value is shared across 4 F
shown above. To load the value into the encoder, users must
write to the F
value is not loaded until the F
Note that the ADV7322 power-up value for F
precise NTSC F
SC
SC
SC
SC
Subcarrier
Subcarrier
Number
Number
Register 0: 0x1F
Register 1: 0x7C
Register 2: 0xF0
Register 3: 0x21
SC
of
of
registers in sequence, starting with F
SC
Frequency
Re
subcarrier
27
, write 0x1F to this register.
gister
MHz
SC
Value
clk
Register
periods
cycles
SC
4 write is complete.
§
¨
©
in
227
in
1716
one
one
5 .
·
¸
¹
video
video
u
2
32
SC
0 = 0x1E. For
line
line
569408543
SC
ADV7322
u
registers as
SC
2
0. The
32