參數(shù)資料
型號(hào)： ADV7340
廠(chǎng)商： Analog Devices, Inc.
英文描述： Multiformat Video Encoder, Six 12-Bit Noise Shaped Video㈢ DACS
中文描述： 多格式視頻編碼器，6個(gè)12位噪聲整形視頻㈢交叉連接系統(tǒng)
文件頁(yè)數(shù)： 52/88頁(yè)
文件大小： 1066K
代理商： ADV7340
ADV7340/ADV7341
Programming the F
SC
The subcarrier frequency register value is divided into four F
SC
registers, as shown in the previous example. The four subcarrier
frequency registers must be updated sequentially, starting with
Subcarrier Frequency Register 0 and ending with Subcarrier
Frequency Register 3. The subcarrier frequency updates only
after the last subcarrier frequency register byte has been
received by the ADV7340/ADV7341.
Typical F
SC
Values
Table 38 outlines the values that should be written to the
subcarrier frequency registers for NTSC and PAL B/D/G/H/I.
Rev. 0 | Page 52 of 88
Table 38. Typical F
SC
Values
Subaddress
0x8C
0x8D
0x8E
0x8F
SD NONINTERLACED MODE
Subaddress 0x88, Bit 1
The ADV7340/ADV7341 support a SD noninterlaced mode.
Using this mode, progressive inputs at twice the frame rate of
NTSC and PAL (240p/59.94 Hz and 288p/50 Hz, respectively)
Description
F
SC
0
F
SC
1
F
SC
2
F
SC
3
NTSC
0x1F
0x7C
0xF0
0x21
PAL B/D/G/H/I
0xCB
0x8A
0x09
0x2A
can be input into the A ADV7340/ADV7341. The SD noninter-
laced mode can be enabled using Subaddress 0x88, Bit 1.
A 27 MHz clock signal must be provided on the CLKIN_A pin.
Embedded EAV/SAV timing codes or external horizontal and
vertical synchronization signals provided on the S_HSYNC and
S_VSYNC pins can be used to synchronize the input pixel data.
All input configurations, output configurations and features
available in NTSC and PAL modes are available in SD
noninterlaced mode.
For 240p/59.94 Hz input, the ADV7340/ADV7341 should be
configured for NTSC operation and Subaddress 0x88, Bit 1
should be set to 1.
For 288p/50 Hz input, the ADV7340/ADV7341 should be
configured for PAL operation and Subaddress 0x88, Bit 1
should be set to 1.
SD SQUARE PIXEL MODE
Subaddress 0x82, Bit 4
The ADV7340/ADV7341 can be used to operate in square pixel
mode (Subaddress 0x82, Bit 4). For NTSC operation, an input
clock of 24.5454 MHz is required. Alternatively, for PAL
operation, an input clock of 29.5 MHz is required. The internal
timing logic adjusts accordingly for square pixel mode
operation. In square pixel mode, the timing diagrams shown in
Figure 63 and Figure 64 apply.
Y
C
r
Y
F
F
0
0
0
0
X
Y
8
0
1
0
8
0
1
0
F
F
0
0
F
F
A
B
A
B
A
B
8
0
1
0
8
0
1
0
F
F
0
0
0
0
X
Y
C
b
YC
r
C
b
Y
C
b
Y
C
r
EAV CODE
SAV CODE
ANCILLARY DATA
(HANC)
4 CLOCK
4 CLOCK
272 CLOCK
1280 CLOCK
4 CLOCK
4 CLOCK
344 CLOCK
1536 CLOCK
END OF ACTIVE
VIDEO LINE
START OF ACTIVE
VIDEO LINE
ANALOG
VIDEO
INPUT PIXELS
NTSC/PAL M SYSTEM
(525 LINES/60Hz)
PAL SYSTEM
(625 LINES/50Hz)
Y
0
Figure 63. Square Pixel Mode EAV/SAV Embedded Timing
FIELD
PIXEL
DATA
PAL = 308 CLOCK CYCLES
NTSC = 236 CLOCK CYCLES
Cb
Y
Cr
Y
HSYNC
0
Figure 64. Square Pixel Mode Active Pixel Timing
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PDF描述
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