ADV8003 Hardware Manual
Rev. B, August 2013
115
Figure 42: DDR2 PLL Architecture
shows the block diagram of the PLL with the relevant I
2
C controls. The formula used to determine the frequency of the DDR2
memory interface clock is given in
1
_
_
)
_
_
)(
(
_
2
+
≡
div
pre
plldll
div
sel
plldll
F
F
xtal_clk
clk
ddr
Equation 3: DDR2 Memory Interface Clock Frequency
The DDR2 clock frequency must not be changed during operation and should only be set prior to initialization of the memory interface.
plldll_sel_div[5:0]
, IO Map,
Address 0x1AA2[5:0]
This signal is used to control the DDR2 PLL loop divider. The DDR2 clock frequency is given by: fxtal * i2c_plldll_sel_div /
i2c_plldll_pre_div.
plldll_pre_div[1:0]
, IO Map,
Address 0x1AA3[3:2]
This signal is used to control the DDR2 PLL pre divider.
2.2.5.2.
DDR2 Bandwidth and Memory Selection
The DDR2 interface on ADV8003 can be configured to work with one or two (default) DDR2 memories. Using a single DDR2 memory
limits the amount of functionality. Different capabilities are possible with different memory sizes. An outline of expected limitations are
outlined in
and
Table 10: Indication of ADV8003 Capabilities with One DDR2 Memory
Features
FRC
Motion
Adaptive De-
interlacing
Random Noise
Reduction
OSD
Dual Output (ADV8003-1 only)
SD input
Supported
Supported
Supported
Total area of all OSD
regions (on screen at
same time) must be <
2 * 720 * 480 pixels.
(Entire OSD can be up-
scaled to desired
output resolution)
Supported
HD input
(720p)
Supported
N/A
Not supported
Supported
HD input
(1080i)
Supported
Intra-field
interpolation
not supported
Not supported
Supported
HD input
(1080p)
Not supported
- VSP_3D works
in bypass
mode
N/A
Not supported
Support only for:
TX1 ->1080p; TX2 ->
480p/720p/1080p, as VSP_3D
works in bypass mode
Содержание ADV8003
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