Datasheet

ADV7189B
Rev. B | Page 50 of 104
CGMS Data Registers
CGMS1[7:0], Address 0x96[7:0],
CGMS2[7:0], Address 0x97[7:0],
CGMS3[7:0], Address 0x98[7:0]
219HFigure 33 shows the bit correspondence between the analog
video waveform and the CGMS1/CGMS2/CGMS3 registers.
CGMS3[7:4] are undetermined and should be masked out
by software.
Closed Caption Data Registers
CCAP1[7:0], Address 0x99[7:0],
CCAP2[7:0], Address 0x9A[7:0]
220HFigure 34 shows the bit correspondence between the analog
video waveform and the CCAP1/CCAP2 registers. CCAP1[7]
contains the parity bit from the first word. CCAP2[7] contains
the parity bit from the second word. Refer to the GDECAD
Gemstar Decode Ancillary Data Format, Address 0x4C[0]
section.
04983-0-033
012 3 4 5 6 7 0 1 2 3 4 5 6 7 0 1 2 3
CGMS2[7:0] CGMS3[3:0]CGMS1[7:0]REF
+100 IRE
+70 IRE
0 IRE
–40 IRE
11.2μs
49.1μs ± 0.5μs
CRC SEQUENCE
2.235μs
± 20ns
Figure 33. CGMS Data Extraction
Table 60. CGMS Access Information
Signal Name Register Location Address Register Default Value
CGMS1[7:0] CGMS 1[7:0] 150d 0x96 Readback Only
CGMS2[7:0] CGMS 2[7:0] 151d 0x97 Readback Only
CGMS3[3:0] CGMS 3[3:0] 152d 0x98 Readback Only
0
REFERENCE COLOR BURST
(9 CYCLES)
FREQUENCY = F
SC
= 3.579545MHz
AMPLITUDE = 40 IRE
1
CCAP1[7:0]
7 CYCLES
OF 0.5035MHz
(CLOCK RUN-IN)
CCAP2[7:0]
2 3 4 5 6 7 0 1 2 3 4 5 67
P
A
R
I
T
Y
S
T
A
R
T
P
A
R
I
T
Y
BYTE 1BYTE 0
33.764μs
10.003μs
10.5 ± 0.25μs 12.91μs
27.382μs
50 IRE
40 IRE
04983-0-034
Figure 34. Closed-Caption Data Extraction
Table 61. CCAP Access Information
Signal Name Register Location Address Register Default Value
CCAP1[7:0] CCAP 1[7:0] 153d 0x99 Readback Only
CCAP2[7:0] CCAP 2[7:0] 154d 0x9A Readback Only