ak8825 AKM Semiconductor, Inc., ak8825 Datasheet - Page 101

• Manufacturer Part Number: ak8825
• Description: Hd/sd Multi Format Video Encoder With 3ch Dac
• Manufacturer: AKM Semiconductor, Inc.

■ Adjustable Timing Function Between SYNC signal and HDY Signal, Between HDPB Signal and HDPr signal
HDYDELAY[2:0]-bit of HDYPBPR Delay Control Register [SubAddress 0x02].
Adjustable range between SYNC signal and Y signal is +/- 3clocks.
Adjustable unit in 525i / p mode is based on 27MHz clock and in 1080i/720p modes it is based on 74.25MHz clock.
By this bit manipulation, Pb/Pr are shifted similarly as in the case of Y.
Pb / Pr signals with Y signal relation are adjusted by PBPRDELAY[2:0]-bit of HDYPBPR Delay COntrol Register
[SubAddress0x02].
Adjustable range is +/- 3clocks. Adjustable unit in 525i / p modes is based on 27MHz clock, and in 080i/720p modes, it is based
on 74.25MHz.
Rev-E-00
(default)
(default)
SYNC Timing and Y signal output relation is adjustable in the AK8825. Setting of adjustable amount is made by
Y
Y
Y
Y
SYNC signal and Y signal relation
SYNC signal and Y signal relation
185T @ 74.25MHz
247T @ 27MHz
241T @ 27MHz
244T @ 27MHz
191T @ 74.25MHz
188T @ 74.25MHz
Fig. 143 525i/p, 625i/p mode
Fig. 144 1080i mode
101
Pb/Pr
Pb/Pr
Y
Y
Y signal and PbPr signal relation
Y signal and PbPr signal relation
3clk 3clk
3clk 3clk
74.25MHz-clock
27MHz-clock
2008/03
[AK8825]