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參數(shù)資料
型號(hào)： ADV7324KSTZ
廠商： ANALOG DEVICES INC
元件分類： 顏色信號(hào)轉(zhuǎn)換
英文描述： Multiformat 216 MHz Video Encoder with Six NSV 14-Bit DACs
中文描述： COLOR SIGNAL ENCODER, PQFP64
封裝： LEAD FREE, MS-026BCD, LQFP-64
文件頁(yè)數(shù)： 46/92頁(yè)
文件大小： 992K
代理商： ADV7324KSTZ
ADV7324
VERTICAL BLANKING INTERVAL
The ADV7324 accepts input data that contains VBI data (such
as CGMS, WSS, VITS) in SD and HD modes.
Rev. 0 | Page 46 of 92
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.
This data can be present on Line 10 to Line 20 for SD NTSC
and on Line 7 to Line 22 for PAL.
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 [Address 0x4A,
Bit 3] must be enabled to allow VBI data to pass through the
ADV7324. Otherwise, the ADV7324 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.
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
32
2
27
×
=
line
video
one
in
cycles
clock
MHz
of
Number
line
video
one
in
periods
subcarrier
of
Number
Register
Frequency
Subcarrier
where the sum is rounded to the nearest integer.
For example, in NTSC mode
569408543
1716
5
227
2
32
=
×
=
Value
Register
Subcarrier
where:
Subcarrier Register Value
= 0x21F07C1F
SD F
SC
Register 0: 0x1F
SD F
SC
Register 1: 0x7C
SD F
SC
Register 2: 0xF0
SD F
SC
Register 3: 0x21
See the MPU Port Description section for more details on
accessing the subcarrier frequency registers.
Programming the F
SC
The subcarrier register value is divided into four F
SC
registers, as
shown above. To load the value into the encoder, users must
write to the F
SC
registers in sequence, starting with F
SC
0. The
value is not loaded until the F
SC
4 write is complete.
Note that the ADV7324 power-up value for F
SC
0 is 0x1E. For
precise NTSC F
SC
, write 0x1F to this register.
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