ADV8003 Hardware Manual
Rev. B, August 2013
313
Function
pll_pdn
Description
0
PLL on
1
PLL off
Table 77: Output Oversampling Modes and Rates
Input Mode
Register 0xE401,
Bits[6:4]
PLL and Oversampling Control
Register 0xE400, Bit 1
Oversampling Mode and Rate
SD only
1
SD (2×)
SD only
0
SD (16×)
ED only
1
ED (1×)
ED only
0
ED (8×)
HD only
1
HD (1×)
HD only
0
HD (4×)
SD and ED
1
SD (2×) and ED (8×)
SD and ED
0
SD (16×) and ED (8×)
SD and HD
1
SD (2×) and HD (4×)
SD and HD
0
SD (16×) and HD (4×)
ED only (at 54 MHz)
1
ED only (at 54 MHz) (1×)
ED only (at 54 MHz)
0
ED only (at 54 MHz) (8×)
8.4.2.
Subcarrier Frequency Lock (SFL) Mode
The ADV8003 encoder core can be used in Subcarrier Frequency Lock (SFL) mode (
rtcen
= 11). When SFL mode is enabled, the SFL pin
can receive a serial digital stream from an ADI decoder (for example, ADV784x) which is used to lock the subcarrier frequency. This
enables the ADV8003 encoder to stay locked to a video pixel clock which drifts over the time (this happens with poor video sources like
VCRs). Since the color subcarrier in SD modes is generated from the input pixel clock to the ADV8003, these variations on its frequency
may alter the final color on the CBVS or Y/C output.
Hence, the SFL mode allows the ADV8003 encoder core to automatically alter the subcarrier frequency to compensate for these line
length variations. When the part is connected to a device such as an ADV784x video decoder that outputs a digital data stream in the SFL
format, the part automatically changes to the compensated subcarrier frequency on a line-by-line basis. This digital data stream is 67-bits
wide, and the subcarrier is contained in Bit 0 to Bit 21. Each bit is two clock cycles long.
rtcen[1:0]
, Encoder Map,
Address 0xE484[2:1]
This signal is used to select if the encoder is to be used in Timing Reset Mode, Subcarrier Phase Reset Mode or Subcarrier Frequency
Lock Mode. The value of these register bits along with the status of the SFL pin determine the operation.
Function
rtcen[1:0]
Description
00
Disabled
01
Subcarrier phase reset mode enabled
10
Timing reset mode enabled
11
SFL mode enabled
8.4.3.
SD VCR FF/RW Synchronization
In DVD record applications where the encoder is used with a decoder, the VCR FF/RW synchronization control bit can be used for
nonstandard input video. This is in fast forward or rewind modes.
In fast forward mode, the sync information at the start of a new field in the incoming video usually occurs before the correct number of
Summary of Contents for ADV8003
Page 366: ...ADV8003 Hardware Manual Rev B August 2013 366 Figure 144 ADV8003 Schematic Page 4...
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