ADV7172KST Analog Devices Inc, ADV7172KST Datasheet - Page 44

• Manufacturer Part Number: ADV7172KST
• Manufacturer: Analog Devices Inc

Specifications of ADV7172KST

• Number Of Dac's: 6
• Adc/dac Resolution: 10b
• Screening Level: Commercial
• Package Type: LQFP
• Pin Count: 48
• Lead Free Status / RoHS Status: Not Compliant

The ADV7172/ADV7173 supports Copy Generation Management System (CGMS) conforming to the standard. CGMS data is
transmitted on Line 20 of the odd fields and Line 283 of 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 ADV7172/ADV7173 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 refer-
ence pulse of the same amplitude and duration as a CGMS bit (see Figure 70). These 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 the 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 ADV7172/ADV7173 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
Logic “0,” all 20 bits (C0–C19) are directly output from the CGMS registers (no CRC calculated, must be calculated by the user).
Function of CGMS Bits
Word 0 – 6 Bits
Word 1 – 4 Bits
Word 2 – 6 Bits
CRC
Word 0
B1
B2
B3
Word 0
B4, B5, B6
Word 1
B7, B8, B9, B10
Word 2
B11, B12, B13, B14 Identification signal and information incidental to Word 0
ADV7172/ADV7173
– 6 Bits
100 IRE
–40 IRE
Aspect Ratio
Display Format
Undefined
70 IRE
0 IRE
CRC Polynomial = X
Identification information about video and other signals (e.g., audio)
Identification signal incidental to Word 0
11.2 s
1
16:9
Letterbox
COPY GENERATION MANAGEMENT SYSTEM (CGMS)
2.235 s
6
+ X + 1 (Preset to 111111)
REF
0
4:3
Normal
20ns
C0
C1
C2
APPENDIX 3
C3
C4
6
+ X + 1 with a preset value of 111111. If C/W04 is set to a
C5
C6
C7
49.1 s
C8
C9 C10 C11 C12 C13 C14 C15 C16 C17 C18 C19
0.5 s
CRC SEQUENCE