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LF2301 Arkusz danych(PDF) 3 Page - LOGIC Devices Incorporated

Numer części LF2301
Szczegółowy opis  Image Resampling Sequencer
Download  18 Pages
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Producent  LODEV [LOGIC Devices Incorporated]
Strona internetowa  http://www.logicdevices.com
Logo LODEV - LOGIC Devices Incorporated

LF2301 Arkusz danych(HTML) 3 Page - LOGIC Devices Incorporated

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DEVICES INCORPORATED
Video Imaging Products
2-3
LF2301
Image Resampling Sequencer
08/16/2000–LDS.2301-H
impedance state. Users may then
access external memory. Normal
operation resumes on the next clock
cycle after NOOP goes HIGH. NOOP
is latched on the rising edge of CLK.
OETA — Target Memory Output Enable
When OETA is HIGH, UWRI and U11-0
are forced to the high-impedance
state. When OETA is LOW, UWRI
and U11-0 are enabled on the next
clock cycle. OETA is latched on the
rising edge of CLK.
Flags
CZERO — Coefficient Zero
If in a row device x<0,
XMIN
≤x≤XMAX, or x≥4096, the
registered CZERO flag goes HIGH . If
0
≤x<XMIN or XMAX<x<4096, CZERO
goes LOW. In an ITS, when the source
address falls outside a rectangle with
vertices (XMIN, YMIN), (XMAX,
YMIN), (XMIN, YMAX), and (XMAX,
YMAX), the logical AND of the
CZERO flags from the row and
column of the LF2301s will go LOW
representing an invalid address.
END — End of Row/Frame
When two LF2301s are used to form
an ITS, the END flag on each device
is connected to INTER on the other
device. The END flag from the row
device indicates an “end of line” to the
column device. The END flag from
the column device indicates a “bottom
of frame” to the row device, forcing a
reset of the address counter.
When Mode is set to “00” or “10”
END goes HIGH on the row device
for (K+1) x (K+1) clock cycles
starting[2 x (K+1) x (K+1)] + 1 clock
cycles before the last X address of a
row. END goes HIGH on the column
device for (K+1)3 x (UMAX-UMIN)
clock cycles starting at (K+1)3 x
(UMAX-UMIN) + 1 clock cycles before
the last X address of a frame.
When Mode is set to “01” or “11”
END goes HIGH on the row device
for K+1 clock cycles starting at (K+1) +
2 clock cycles before the last X address
of a row. END goes HIGH on the
column device for (K+1) x (K+1)
clock cycles starting at [(K+1) x (K+1)] +
1 clock cycles before the last X address
of a frame.
DONE — End of Transform
In a two LF2301 system, after the last
walk of the last row of an image, the
registered DONE flag goes HIGH
indicating the end of the transform.
DONE goes HIGH one clock cycle
before the last X address of a frame. If
AIN is HIGH, DONE will remain
HIGH for one clock cycle. If AIN is
LOW, DONE will remain HIGH until
a new transform begins.
Transformation Control Parameters
XMIN, XMAX, YMIN, YMAX
XMIN, XMAX, YMIN, YMAX define
the valid area in the source image
from which pixels may be read. The
CZERO flags will denote a valid
memory read whenever the LF2301s
generate an (x,y) address within this
boundary.
UMIN, UMAX, VMIN, VMAX
UMIN, UMAX, VMIN, VMAX define
the area in the destination image into
which pixels will be written.
(UMIN, VMIN) is the top left corner
and (UMAX + 1, VMAX) is the bottom
right corner. The following conditions
must be met: UMAX>UMIN and
VMAX>VMIN.
x0, y0
x0, y0 determine what the first pixel read
out of the source image will be at the
beginning of an image transformation.
x0, y0 will be the upper left corner of the
original image in non-inverting, non-
reversing applications.
dx/du
dx/du is the displacement along the
x axis corresponding to a one-pixel
movement along the u axis.
dx/dv
dx/dv is the displacement along the
x axis corresponding to each one-pixel
movement along the v axis.
dy/du
dy/du is the displacement along the
y axis corresponding to each one-pixel
movement along the u axis.
dy/dv
dy/dv is the displacement along the
y axis corresponding to each one-pixel
movement along the v axis.
d2x/du2
d2x/du2 determines the rate of change
of dx/du with each step along a line
in the output image.
d2x/dv2
d2x/dv2 determines the rate of change
of dx/dv with each step down a
column in the output image.
d2y/du2
d2y/du2 determines the rate of change
of dy/du with each step along a line
in the output image.
d2y/dv2
d2y/dv2 determines the rate of change
of dy/dv with each step down a
column in the output image.
d2x/dudv
d2x/dudv determines the rate of
change of dx/du while moving
vertically through the output image.
d2x/dudv also determines the rate of
change of dx/dv while moving
horizontally through the output
image.
d2y/dudv
d2y/dudv determines the rate of
change of dy/dv while moving
horizontally through the output
image. d2y/dudv also determines the
rate of change of dy/du while
moving vertically through the output
image.


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