ADV7174KCPZ Analog Devices Inc, ADV7174KCPZ Datasheet - Page 42

• Manufacturer Part Number: ADV7174KCPZ
• Manufacturer: Analog Devices Inc

Specifications of ADV7174KCPZ

• Adc/dac Resolution: 10b
• Screening Level: Commercial
• Package Type: LFCSP EP
• Pin Count: 40
• Lead Free Status / RoHS Status: Compliant

ADV7174/ADV7179
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,
FUNCTION OF CGMS BITS
Word 0 –6 Bits
Word 1 –4 Bits
Word 2 –4 Bits
CRC –6 Bits CRC Polynomial = X
Table 21. Bit 1–Bit 14
Word
Word 0
Word 1
Word 2
100 IRE
–40 IRE
70 IRE
0 IRE
Bit
B1
B2
B3
B4, B5, B6
B7, B8, B9, B10
B11, B12, B13, B14
11.2 μ s
6
+ X + 1 (Preset to 111111)
Function
Aspect Ratio
Display Format
Undefined
Identification information about video and other signals, for example, audio
Identification signal incidental to Word 0
Identification signal and information incidental to Word 0
2.235 μ s ± 20ns
REF
C0
Figure 57. CGMS Waveform Diagram
C1
C2
Rev. B | Page 42 of 52
C3
1
16:9
Letterbox
C4
C5
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 X
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).
C6
C7
49.1 μ s ± 0.5 μ s
C8
C9 C10 C11 C12 C13 C14 C15 C16 C17 C18 C19
0
4:3
Normal
6
+ X + 1 with a preset value of 111111. If
CRC SEQUENCE