參數(shù)資料
型號: 935262922551
廠商: NXP SEMICONDUCTORS
元件分類: 消費(fèi)家電
英文描述: SPECIALTY CONSUMER CIRCUIT, PQFP160
封裝: PLASTIC, SOT-322, QFP-160
文件頁數(shù): 108/147頁
文件大?。?/td> 526K
代理商: 935262922551
1998 Apr 09
63
Philips Semiconductors
Product specication
Multimedia bridge, high performance
Scaler and PCI circuit (SPCI)
SAA7146A
7.8.8
COMPARISON BETWEEN CCIR 656 LINE AND SOURCE LINE COUNTER
This section describes how to choose the vertical offset and how to use the source line counter event for RPS
programming for capturing the expected line.
The internal Source Line Counter (SLC) is reset by the selected edge of the vertical sync signal which is provided at port
VS_x. The falling and rising edges of this signal are selected by the SYNC_X bits in the ‘Initial settings DD1 Port Register’
(offset = 50H). Consequently, the behaviour of the SLC depends on the connected vertical sync signal so that different
offsets must be selected to capture the expected line. The active video begins in the CCIR 656 line 23 of the video signal;
Table 54 lists the different offsets which must be selected to capture the expected line. The subsequent diagrams and
tables illustrate the relationship between the different vertical sync signals of the PAL and NTSC standards, the ODD and
EVEN field and the internal SLC.
(1) LQ = qualified lines, i.e. lines containing at least one qualified pixel.
Fig.14 Reference signals for scaling window.
handbook, full pagewidth
MHB055
line
HS_x
PXQ_x
VS_x
LQ
(1)
ACTIVE VIDEO WINDOW
NumBytes
NumLines
HXO
BXO
HYO
BYO
SCALING
WINDOW
field/
frame
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