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5.5 CGMS
-A/ID-1
5.5.1
Description and specifications
What is CGMS-A (Copy Generation Management System)?
CGMS-A is a system of multiplexing the copy control information in the vertical sync blanking
intervals, and sending it.
What is ID-1?
ID-1 is a system of multiplexing the aspect ratio information in the vertical sync blanking intervals,
and sending it.
• NTSC, NTSC-M, NTSC-443
• PAL-60,
PAL-M
CGMS-A and ID-1 are superimposed onto line 20 (first field) and line 283 (second field). The
CGMS-A and ID-1 waveform consists of the reference bit and 20-bit data. This waveform and the bit
allocation are shown below.
70IRE±10IRE
0IRE
11.2us±0.3us
2.235us±50ns
Reference
1 2 3 4 … 20
Bit no
49.1us±0.44us
Line 20/283
CGMS-A / ID-1
• Bit1-0:
Aspect
(ID1)
Bit
Applications
1 2 Aspect ratio
Picture display format
0 0 4:3
Normal
1 0 16:9
Normal
0 1 4:3
Letter
Box
1 1 Not
Defined
• Bit6-2: Fixed at “0000”
Summary of Contents for VG-870B
Page 1: ...Programmable Video Signal Generator VG 870B 871B 873 874 Instruction Manual Ver 3 80 ...
Page 2: ......
Page 4: ......
Page 14: ...x ...
Page 58: ...40 ...
Page 220: ...202 4 12 8 DDC CI For further details on the setting procedure refer to 6 13 4 DDC CI ...
Page 286: ...268 ...
Page 362: ...344 0 1 2 3 4 5 6 ...
Page 394: ...376 ...
Page 426: ...408 ...
Page 450: ...432 ...
Page 537: ...Chapter 11 SPECIFICATIONS 519 F0H letters me 1 F1H letters me 2 VESA specifications ...
Page 538: ...520 F2H Chinese character AI F3H Chinese character BI ...
Page 539: ...Chapter 11 SPECIFICATIONS 521 F4H Chinese character TAKA F5H Chinese character KIRI ...
Page 540: ...522 F6H Chinese character KEN F7H Burst ...
Page 542: ...524 5 7 character pattern table 2 of 2 ...
Page 543: ...Chapter 11 SPECIFICATIONS 525 7 9 character pattern table 1 of 2 ...
Page 544: ...526 7 9 character pattern table 2 of 2 8 9 dots are used for 80H to 8FH ...
Page 545: ...Chapter 11 SPECIFICATIONS 527 16 16 character pattern table 1 of 4 ...
Page 546: ...528 16 16 character pattern table 2 of 4 ...
Page 547: ...Chapter 11 SPECIFICATIONS 529 16 16 character pattern table 3 of 4 ...
Page 548: ...530 16 16 character pattern table 4 of 4 ...
Page 554: ...536 ...