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LF2301JC55 Arkusz danych(PDF) 3 Page - LOGIC Devices Incorporated |
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LF2301JC55 Arkusz danych(HTML) 3 Page - LOGIC Devices Incorporated |
3 / 18 page 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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