ADV7191 Analog Devices, ADV7191 Datasheet - Page 47

• Manufacturer Part Number: ADV7191
• Description: Video Encoder with Six 10-Bit DACs and Video Encoder with Six DAC Outputs
• Manufacturer: Analog Devices

The ADV7190/ADV7191 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 outputed on ODD and EVEN fields. CGMS data can
only be transmitted when the ADV7190/ADV7191 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 94. These bits are outputed from the con-
figuration 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 ADV7190/ADV7191 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
is set to a Logic 0, all 20 bits (C0–C19) are output directly from
the CGMS registers (no CRC calculated, must be calculated
by the user).
100 IRE
–40 IRE
70 IRE
0 IRE
6
+ X + 1 with a preset value of 111111. If C/W04
11.2 s
COPY GENERATION MANAGEMENT SYSTEM (CGMS)
2.235 s
REF
20ns
C0
C1
C2
APPENDIX 3
C3
C4
Function of CGMS Bits
Word 0 – 6 Bits
Word 1 – 4 Bits
Word 2 – 6 Bits
CRC – 6 Bits
WORD 0
B1
B2
B3
WORD 0
B4, B5, B6
WORD 1
B7, B8, B9,
B10
WORD 2
B11, B12,
B13, B14
C5
C6
C7
49.1 s
C8
C9 C10 C11 C12 C13 C14 C15 C16 C17 C18 C19
0.5 s
CRC Polynomial = X
Aspect Ratio
Display Format
Undefined
Identification Information About Video and
Other Signals (e.g., Audio)
Identification Signal Incidental to Word 0
Identification Signal and Information
Incidental to Word 0
ADV7190/ADV7191
CRC SEQUENCE
1
16:9
Letterbox
6
+ X + 1 (Preset to
111111)
0
4:3
Normal