ADV8003 Hardware Manual
Rev. B, August 2013
110
Primary
VSP
Secondary
VSP
Primary VSP
dpll clock
Secondary VSP
dpll clock
Primary
VSP
Secondary
VSP
Primary VSP
dpll clock
Secondary VSP
dpll clock
Figure 41: PVSP/SVSP Output Clock Configure
For the PVSP and SVSP, the correct clocks must be configured manually. This can be done using the DPLL period registers, which allows
the user to program the sampling rate for the appropriate output format by I
2
C. The equation for calculating this I
2
C value is provided in
MHz
period
phase
dpll
27
12
64
1
_
_
×
×
≡
Equation 1: Calculating DPLL Phase Period
Once the dpll_phase_period is calculated,
is used to calculate the dpll_clock_period.
period
phase
dpll
period
clock
output
period
clock
dpll
_
_
2
_
_
_
_
22
×
≡
Equation 2: Calculating DPLL Clock Period
where output_clock_period is the period of the desired output sampling frequency.
For example, for HD video, the output clock sampling frequency would be 148.5 MHz. This equation returns a decimal value. Once
calculated, this should be converted to hex and written to
and
some common resolutions and their associated dpll_clock_period values.
Table 8: Example Values for dpll_clock_period
Active Resolution
Frame Rate (Hz)
Sampling
Frequency (MHz)
dpll_clock_period
(Hex)
720 x 480i
29.97
13.5
0x180000000
720 x 480p
59.94
27
0x0C0000000
720 x 576i
25
13.5
0x180000000
720 x 576p
50
27
0x0C0000000
960 x 480i
29.97
18
0x120000000
960 x 576i
25
18
0x120000000
1280 x 720p
59.94
74.175
0x045E386DC
1280 x 720p
60
74.25
0x045D1745D
1920 x 1080i
29.97
74.175
0x045E386DC
1920 x 1080i
30
74.25
0x045D1745D
1920 x 1080p
59.94
148.35
0x022F1C36E
1920 x 1080p
60
148.5
0x022E8BA2F
1920 x 1080i
25
74.25
0x045D1745D
Summary of Contents for ADV8003
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