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參數(shù)資料
| 型號： | ADV7321KSTZ |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 41/88頁 |
| 文件大小： | 0K |
| 描述： | IC VID ENC 6-12BIT DAC'S 64LQFP |
| 標準包裝： | 1 |
| 類型： | 視頻編碼器 |
| 應用： | EVD，DVD，SD/PS/HDTV |
| 電壓 - 電源，模擬： | 2.5V |
| 電壓 - 電源，數(shù)字： | 2.5V |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 64-LQFP |
| 供應商設備封裝： | 64-LQFP（10x10） |
| 包裝： | 托盤 |
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ADV7320/ADV7321
Rev. A | Page 46 of 88
VERTICAL BLANKING INTERVAL
The ADV7320/ADV7321 accepts input data that contains VBI
data (such as CGMS, WSS, VITS) in SD and HD modes.
For the SMPTE 293M (525p) standard, 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.
This data can be present on Lines 10 to 20 for SD NTSC and on
Lines 7 to 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 ADV7320/
ADV7321. Otherwise, the ADV7320/ADV7321 automatically
blank the VBI to standard.
If CGMS is enabled and VBI is disabled, the CGMS data will
nevertheless be available at the output.
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
clk
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 FSC Register 0: 0x1F.
SD FSC Register 1: 0x7C.
SD FSC Register 2: 0xF0.
SD FSC Register 3: 0x21.
See the MPU Port Description section for more details on
accessing the subcarrier frequency registers.
Programming the FSC
The subcarrier register value is divided into four FSC registers as
shown above. To load the value into the encoder, users must
write to the FSC registers in sequence, starting with FSC0. The
value is not loaded until the FSC4 write is complete.
Note that the ADV7320/ADV7321 power-up value for FSC0 is
0x1E. For precise NTSC FSC, write 0x1F to this register.
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