ADV7314 Datasheet, PDF (60/84 Pages) Analog Devices – Multiformat 216 MHz Video Encoder with Six NSV 14-Bit DACs

ADV7314
APPENDIX 1—COPY GENERATION
MANAGEMENT SYSTEM
PS CGMS Data Registers 2–0
[Subaddress 21h, 22h, 23h]
PS CGMS is available in 525p mode conforming to CGMS-A
EIA-J CPR1204-1, transfer method of video ID information using
vertical blanking interval (525p system), March 1998, and
IEC61880, 1998, Video systems (525/60)—video and accom-
panied data using the vertical blanking interval—analog
interface.
When PS CGMS is enabled [Subaddress 12h, Bit 6 = 1],
CGMS data is inserted on line 41. The PS CGMS data registers
are at Addresses 21h, 22h, and 23h.
SD CGMS Data Registers 2–0
[Subaddress 59h, 5Ah, 5Bh]
The ADV7314 supports Copy Generation Management System
(CGMS), conforming to the standard. CGMS data is transmit-
ted 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 be transmitted
only when the ADV7314 is configured in NTSC mode. The
CGMS data is 20 bits long, and the function of each of these bits
is as shown in Table XVIII. The CGMS data is preceded by a
reference pulse of the same amplitude and duration as a CGMS
bit; see Figure 62.
HD/PS CGMS [Address 12h, Bit 6]
The ADV7314 supports Copy Generation Management System
(CGMS) in HDTV mode (720p and 1080i) in accordance
with EIAJ CPR-1204-2.
The HD CGMS data registers can be found at Address 021h,
22h, 23h.
Function of CGMS Bits
Word 0–6 bits; Word 1–4 bits; Word 2–6 bits; CRC 6 bits
CRC polynomial = x⁶ + x + 1 (preset to 111111)
720p System
CGMS data is applied to Line 24 of the luminance vertical
blanking interval.
1080i System
CGMS data is applied to Line 19 and on Line 582 of the lumi-
nance vertical blanking interval.
CGMS Functionality
If SD CGMS CRC [Address 59h, Bit 4] or PS/HD CGMS CRC
[Subaddress 12h, Bit 7] 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 ADV7314 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 SD
CGMS CRC [Address 59h, Bit 4] or PS/HD CGMS CRC [Ad-
dress 12h, Bit 7] 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).
Table XVIII.
Bit
WORD0
B1
B2
B3
Function
Aspect ratio
Display format
Undefined
1
16:9
Letterbox
0
4:3
Normal
WORD0
B4, B5, B6
WORD1
B7, B8, B9, B10
WORD2
B11, B12, B13, B14
Identification information about video
and other signals (e.g., audio)
Identification signal incidental to Word 0
Identification signal and information
incidental to Word 0
–60–
REV. 0