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| 型號(hào)： | ADV7179KCPZ-REEL |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 37/52頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC ENCODER VID NTSC/PAL 40LFCSP |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 類型： | 視頻編碼器 |
| 應(yīng)用： | 數(shù)碼相機(jī)，手機(jī)，便攜式視頻 |
| 電壓 - 電源，模擬： | 2.8 V，3.3 V |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 40-VFQFN 裸露焊盤，CSP |
| 供應(yīng)商設(shè)備封裝： | 40-LFCSP-VQ（6x6） |
| 包裝： | 標(biāo)準(zhǔn)包裝 |
| 產(chǎn)品目錄頁面： | 786 (CN2011-ZH PDF) |
| 其它名稱： | ADV7179KCPZ-REELDKR |
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ADV7174/ADV7179
Rev. B | Page 42 of 52
APPENDIX 3—COPY GENERATION MANAGEMENT SYSTEM (CGMS)
The ADV7174/ADV7179 supports the CGMS, conforming to
the standard. CGMS data is transmitted on Line 20 of the odd
fields and on Line 283 of the even fields. Bits C/W05 and
C/W06 control whether or not CGMS data is output on odd
and even fields. CGMS data can only be transmitted when the
ADV7174/ ADV7179 is configured in NTSC mode. The CGMS
data is 20 bits long, the function of each of these bits is as shown
below. The CGMS data is preceded by a reference pulse of the
same amplitude and duration as a CGMS bit (see Figure 57).
The bits are output from the configuration registers in the
following order: C/W00 = C16, C/W01 = C17, C/W02 = C18,
C/W03 = C19, C/W10 = C8, C/ W11 = C9, C/W12 = C10,
C/W13 = C11, C/W14 = C12, C/ W15 = C13, C/W16 = C14,
C/W17 = C15, C/W20 = C0, C/W21 = C1, C/W22 = C2,
C/W23 = C3, C/W24 = C4, C/W25 = C5, C/W26 = C6, C/W27
= C7. If Bit C/W04 is set to a Logic 1, the last six bits, C19–C14,
which comprise the 6-bit CRC check sequence, are calculated
automatically on the ADV7174/ADV7179 based on the lower
14 bits (C0–C13) of the data in the data registers and output
with the remaining 14 bits to form the complete 20 bits of the
CGMS data. The calculation of the CRC sequence is based on
the polynomial X6 + X + 1 with a preset value of 111111. If
C/W04 is set to a Logic 0, all 20 bits (C0–C19) are directly
output from the CGMS registers (no CRC is calculated; it must
be calculated by the user).
FUNCTION OF CGMS BITS
Word 0 –6 Bits
Word 1 –4 Bits
Word 2 –4 Bits
CRC –6 Bits CRC Polynomial = X6 + X + 1 (Preset to 111111)
Table 21. Bit 1–Bit 14
Word
Bit
Function
Word 0
1
0
B1
Aspect Ratio
16:9
4:3
B2
Display Format
Letterbox
Normal
B3
Undefined
B4, B5, B6
Identification information about video and other signals, for example, audio
Word 1
B7, B8, B9, B10
Identification signal incidental to Word 0
Word 2
B11, B12, B13, B14
Identification signal and information incidental to Word 0
CRC SEQUENCE
11.2
μs
2.235
μs ± 20ns
49.1
μs ± 0.5μs
REF
C0
C1
C2
C3
C4
C5
C6
C7
C8
C9 C10 C11 C12 C13 C14 C15 C16 C17 C18 C19
100 IRE
70 IRE
0 IRE
–40 IRE
02980-A
-056
Figure 57. CGMS Waveform Diagram
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