adv7180 Analog Devices, Inc., adv7180 Datasheet - Page 61

• Manufacturer Part Number: adv7180
• Description: 10-bit, 4 X Oversampling Sdtv Video Decoder
• Manufacturer: Analog Devices, Inc.

CCAP
Two bytes of decoded closed caption data are available in the
I
can be obtained from the CC_EVEN_FIELD bit (Register 0x78).
CC_CLEAR, Closed Caption Clear, Address 0x78 [0],
User Sub Map, Write Only, Self-Clearing
1—Reinitializes the CCAP readback registers.
CC_AVL, Closed Caption Available, Address 0x78 [0],
User Sub Map, Read Only
0—Closed captioning was not detected.
1—Closed captioning was detected.
Table 78. CCAP Readback Registers
Signal Name
CCAP_BYTE_1[7:0]
CCAP_BYTE_2[7:0]
1
2
The register is a readback register; default value does not apply.
C registers. The field information of the decoded CCAP data
50 IRE
40 IRE
FREQUENCY = F
REFERENCE COLOR BURST
AMPLITUDE = 40 IRE
1
10.5 ± 0.25µs
Register Location
VDP_CCAP_DATA_0[7:0]
VDP_CCAP_DATA_1[7:0]
10.003µs
(9 CYCLES)
Figure 45. CCAP Waveform and Decoded Data Correlation
SC
27.382µs
= 3.579545MHz
Rev. B | Page 61 of 112
(CLOCK RUN-IN)
OF 0.5035MHz
12.91µs
7 CYCLES
CC_EVEN_FIELD, Address 0x78 [1], User Sub Map,
Read Only
Identifies the field from which the CCAP data was decoded.
0—Closed captioning was detected on an odd field.
1—Closed captioning was detected on an even field.
VDP_CCAP_DATA_0, Address 0x79 [7:0], User Sub Map,
Read Only
Decoded Byte 1 of CCAP data.
VDP_CCAP_DATA_1, Address 0x7A [7:0], User Sub Map,
Read Only
Decoded Byte 2 of CCAP data.
S
T
A
R
T
0
VDP_CCAP_D ATA_0
1
2 3 4 5 6 7 0 1 2 3 4 5 6 7
121
122
33.764µs
P
A
R
Y
T
I
VDP_CCAP_D ATA_1
Address (User Sub Map)
P
A
R
T
Y
I
0x79
0x7A
ADV7180