參數(shù)資料
型號： ZR36506
英文描述： Fast Recovery Rectifier Diodes
中文描述： 外圍芯片
文件頁數(shù)： 49/99頁
文件大小： 452K
代理商： ZR36506
Zoran ZR 36506 USBV ision – Datasheet
Zoran Proprietary and Confidential
Video I nput I nterface
8 -7
The parameter that controls the effective frame rate is called FRM_RATE, and is specified in the
following table:
Parameter
Register
Address
Usage
Numerator[4..0]
Reg.37/d4-d0
n
Frame Drop factor (
n
= 0-31). Effective
frame rate is:
NTSC: 30*(
n
+1)/
d.
PAL: 25*(
n
+1)/
d.
Denum.code[1..0]
Reg.37/d6-d5
code for
d
'00':
d
=32.
'01':
d
=30.
'10':
d
=25.
The
n
parameter ranges from 0 to
d
-1. The value
n
=
d
-1 instructs the ZR36506 to transfer to the
host computer the full frame-rate that is delivered from the video source. Any value
n
that is less
than
d
-1 results in dropped frames from time to time, so that the effective frame rate is only
(
n
+1)/
d
of the full frame-rate.
V ideo S caling
The ZR36506 has two independent down scalers: one for frame width and one for frame height.
It is the responsibility of the software application to select scale factors that result in a reasonable
aspect ratio.
In order to set the scaling factor, the host computer must simply specify the desired size of the
output frame (assuming XSIZE_IN and YSIZE_IN are initially set). Scaling is performed
automatically by the ZR36506, regarding the output frame size versus the input frame size.
The following table specifies the parameters that are used to set the output frame size:
Parameter
Register
Address
Usage
XSIZE_O [9..0]
Regs.38-39
LXSIZE_O
MXSIZE_O
Number of pixels in line of scaled output
video frame.
YSIZE_O [9..0]
Regs.40-41
LYSIZE_O
MYSIZE_O
Number of lines in scaled output video
frame/field.
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