Table 62: Recommended N And Expected Cts Values For 32 Khz Audio - Analog Devices ADV8003 Hardware Manual

Manual mode: Manual mode is selected by setting
chip via the cts_manual[19:0]
from the same crystal; thus CTS should be a fixed number.
Automatic mode: Automatic mode is selected by setting
audio and video rates. The result can be read from the
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
cts_sel, TX2 Main Map, Address 0xF40A[7]
This bit is used to specify whether CTS is automatically or manually set.
Function
cts_sel
0 
1
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.
Rev. B, August 2013
cts_sel
field. Manual mode is good for coherent audio and video, where the audio and video clocks are generated
Description
Automatic CTS. Use the internally generated CTS value
Manual CTS. Use the CTS programmed via CTS_MANUAL[19:0]

Table 62: Recommended N and Expected CTS Values for 32 kHz Audio

Pixel Clock (MHz)
25.2/1.001
25.2
27
27 * 1.001
54
54 * 1.001
74.25/1.001
74.25
148.5/1.001
148.5
Other
to 1. In manual mode, the user can program the CTS number directly into the
cts_sel to 0. In automatic mode, the chip computes the CTS based on the actual
cts_internal[19:0] field. Automatic mode is good for incoherent audio or video,
n[19:0]
32 kHz
N CTS
4576 28125
4096 25200
4096 27000
4096 27027
4096 54000
4096 54054
11648 210937 – 210938
4096 74250
11648 421875
4096 148500
4096 Measured
274
ADV8003 Hardware Manual
field.