ADV8003 Hardware Manual
Rev. B, August 2013
274
Manual mode:
Manual mode is selected by setting
to 1. In manual mode, the user can program the CTS number directly into the
field. Manual mode is good for coherent audio and video, where the audio and video clocks are generated
from the same crystal; thus CTS should be a fixed number.
Automatic mode:
Automatic mode is selected by setting
to 0. In automatic mode, the chip computes the CTS based on the actual
audio and video rates. The result can be read from the
field. Automatic mode is good for incoherent audio or video,
where there is no simple integer ratio between the audio and video clock.
The 20-bit n value used by the Tx core of the ADV8003 can be programmed in the
field.
cts_sel
, TX2 Main Map,
Address 0xF40A[7]
This bit is used to specify whether CTS is automatically or manually set.
Function
cts_sel
Description
0
Automatic CTS. Use the internally generated CTS value
1
Manual CTS. Use the CTS programmed via CTS_MANUAL[19:0]
cts_manual[19:0]
, TX2 Main Map,
Address 0xF407[3:0]; Address 0xF408[7:0]; Address 0xF409[7:0]
This signal is used to manually set the Cycle Time Stamp (CTS). This parameter is used with the N parameter to regenerate the audio
clock in the Rx.
cts_internal[19:0]
, TX2 Main Map,
Address 0xF404[3:0]; Address 0xF405[7:0]; Address 0xF406[7:0] (Read Only)
This signal is used to readback the automatically generated Cycle Time Stamp (CTS) parameter. This parameter is used with the N
parameter to regenerate the audio clock in the Rx.
n[19:0]
, TX2 Main Map,
Address 0xF401[3:0]; Address 0xF402[7:0]; Address 0xF403[7:0]
This signal is used to specifies the audio clock regeneration parameter N. This parameter is used with CTS to regenerate the audio clock
in the Rx.
Table 62: Recommended N and Expected CTS Values for 32 kHz Audio
32 kHz
Pixel Clock (MHz)
N
CTS
25.2/1.001
4576
28125
25.2
4096
25200
27
4096
27000
27 * 1.001
4096
27027
54
4096
54000
54 * 1.001
4096
54054
74.25/1.001
11648
210937 – 210938
74.25
4096
74250
148.5/1.001
11648
421875
148.5
4096
148500
Other
4096
Measured
Содержание ADV8003
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Страница 402: ...ADV8003 Hardware Manual Rev B August 2013 402 APPENDIX D PACKAGE OUTLINE DRAWING Refer to Section 1 4...
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