adv7342 Analog Devices, Inc., adv7342 Datasheet - Page 50

• Manufacturer Part Number: adv7342
• Description: Multiformat Video Encoder Six, 11-bit, 297 Mhz Dacs
• Manufacturer: Analog Devices, Inc.

ADV7342/ADV7343
SD VCR FF/RW SYNC
Subaddress 0x82, Bit 5
In DVD record applications where the encoder is used with a
decoder, the VCR FF/RW sync control bit can be used for non-
standard input video, that is, in fast forward or rewind modes.
In fast forward mode, the sync information at the start of a new
field in the incoming video usually occurs before the correct
number of lines/fields is reached. In rewind mode, this sync
signal usually occurs after the total number of lines/fields is
reached. Conventionally, this means that the output video has
corrupted field signals because one signal is generated by the
incoming video and another is generated when the internal
line/field counters reach the end of a field.
When the VCR FF/RW sync control is enabled (Subaddress 0x82,
Bit 5), the line/field counters are updated according to the
incoming VSYNC signal and when the analog output matches
the incoming VSYNC signal.
This control is available in all slave-timing modes except
Slave Mode 0.
VERTICAL BLANKING INTERVAL
Subaddress 0x31, Bit 4; Subaddress 0x83, Bit 4
The ADV7342/ADV7343 are able to accept input data that
contains VBI data (such as CGMS, WSS, and VITS) in SD, ED,
and HD modes.
If VBI is disabled (Subaddress 0x31, Bit 4 for ED/HD;
Subaddress 0x83, 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 timing modes.
1
2
3
4
5
FOR EXAMPLE, VCR OR CABLE.
F
SEQUENCE BIT
RESET ADV7342/ADV7343 DDS.
SELECTED BY SUBADDRESS 0x01, BIT 7.
F
PAL: 0 = LINE NORMAL, 1 = LINE INVERTED
NTSC: 0 = NO CHANGE
SC
SC
RTC
PLL INCREMENT IS 22 BITS LONG. VALUE LOADED INTO ADV7342/ADV7343 F
PLL INCREMENTS BITS 21:0 PLUS BITS 0:9 OF SUBCARRIER FREQUENCY REGISTERS.
Figure 62. SD Subcarrier Frequency Lock Timing and Connections Diagram (Subaddress 0x84, Bits [2:1] = 11)
COMPOSITE
H/L TRANSITION
COUNT START
VIDEO
TIME SLOT 01
128
1
LOW
ADV7403
VIDEO
DECODER
13
LCC1
SUBCARRIER
14 BITS
PHASE
P[19:12]
SFL
0
14
4 BITS
RESERVED
Rev. 0 | Page 50 of 88
21
19
ADV7342/ADV7343
CLKIN_A
SFL/MISO
Y[7:0]/S[7:0]
SAMPLE
F
VALID
For the SMPTE 293M (525p) standard, VBI data can be
inserted on Line 13 to Line 42 of each frame, or on Line 6 to
Line 43 for the ITU-R BT.1358 (625p) standard.
VBI data can be present on Line 10 to Line 20 for NTSC and on
Line 7 to Line 22 for PAL.
In SD Timing Mode 0 (slave option), 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.
If CGMS is enabled and VBI is disabled, the CGMS data is
nevertheless available at the output.
SD SUBCARRIER FREQUENCY REGISTERS
Subaddress 0x8C to Subaddress 0x8F
Four 8-bit registers are used to set up the subcarrier frequency.
The value of these registers is calculated using:
where the sum is rounded to the nearest integer.
For example, in NTSC mode:
where:
Subcarrier Register Value = 569408543d = 0×21F07C1F
SD F
SD F
SD F
SD F
SC
PLL INCREMENT
5
SC
SC
SC
SC
Subcarrier
Subcarrier
Number
Number
INVALID
SAMPLE
Register 0: 0x1F
Register 1: 0x7C
Register 2: 0xF0
Register 3: 0x21
DAC 1
DAC 2
DAC 3
DAC 4
DAC 5
DAC 6
SC
DDS REGISTER IS
of
of
2
Frequency
Register
subcarrier
27
MHz
8/LINE
LOCKED
CLOCK
SEQUENCE
Value
0
clk
BIT
Register
periods
3
cycles
6768
5 BITS
RESERVED
=
⎛
⎜
⎝
RESERVED
RESET BIT
227
1716
in
=
in
one
5 .
one
⎞
⎟
⎠
×
4
video
video
2
32
=
line
line
569408543
×
2
32