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LF2301 Datenblatt(PDF) 4 Page - LOGIC Devices Incorporated |
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LF2301 Datenblatt(HTML) 4 Page - LOGIC Devices Incorporated |
4 / 18 page DEVICES INCORPORATED LF2301 Image Resampling Sequencer 2-4 08/16/2000–LDS.2301-H Video Imaging Products TABLE 3. FIELD OF VIEW F2 F1 F0 FOV 00 0 0 00 1 1 01 0 2 01 1 3 10 0 4 10 1 5 11 0 6 11 1 7 R/C — Row/Column Select When set to 0, the LF2301 functions as a row device. When set to 1, the LF2301 functions as a column device. M1-0 — Mode This 2-bit control word defines four modes as follows (see table 1): The 1st and 3rd modes are single- pass operations where the device walks through a (K + 1) x (K + 1) kernel for each output pixel. K is the kernel size determined by K3-0 in Parameter Register 7. In mode 00, the spiral walk is in the clockwise direc- tion. In mode 10, the spiral walk is in the counter clockwise direction. The 2nd and 4th modes are used together to perform a two-pass operation. The first pass (mode 01) performs a (K+1) kernel in the horizontal dimension. The second pass (mode 11) performs a (K+1) kernel in the vertical dimension. The result of pass 1 is stored in the destination image memory and is used as the source image data for the second pass. A system to switch source and destination memory banks could be designed, or utilization of a second LF2301 pair in a pipelined architecture could be used. In this case, the system would require a third image buffer for the final destination image. K3-0 — Kernel Kernel determines the length of the spiral walk when performing image transformations and the size of the filter when implementing static filters (see table 2). When performing image transformations, the longest spiral walk possible is 4 x 4 pixels (Kernel = 3). For static filters, kernels of up to 16 x 16 pixels (Kernel = 15) are possible. FOV — Field of View FOV determines the distance between pixels in a spiral walk. An FOV of 1 means each step in a spiral walk is one pixel. An FOV of 2 means each step is two pixels, and so on. FOV can be set as high as 7 (see Table 3). It is impor- tant to note when FOV is 0, the x and y addresses will not change during a spiral walk. They will remain fixed at the first pixel address of the spiral walk. ALR — Autoload When set HIGH and upon INIT being strobed, the LDR control is automatically asserted which causes the data currently stored in the Preload Registers to be loaded into the Transformation Parameter Registers. AIN — Autoinit A new transform automatically begins if the AIN bit is HIGH when the end of an image is reached. The DONE flag will go HIGH for one clock cycle. If AIN is LOW, UWRI and the DONE flag remain HIGH until the user strobes the INIT control to begin a new image transformation. PIPE — Pipe Control In order to compensate for buffered source image RAM, PIPE adjusts the timing of UWRI and ACC. If the PIPE bit is HIGH, UWRI and ACC will have a one clock cycle delay added relative to the generation of the target address. TM — Test Mode Calculations of the source image and coefficient addresses are made by an internal 28-bit accumulator. TM allows access to the sign bit and the seven bits below the four coefficient address bits in the accumulator. When TM is HIGH the sign bit and 11 bits below the source image address are fed to X11-0 (see Figure 2). When TM is LOW, the source image address is fed to X11-0. Two clock cycles are required to access both the MS and LS words of the internal accumulator. Functional Description The LF2301 is an address generator designed to be used in an image transformation system (ITS). When implementing an LF2301-based ITS, second-order image transformations can be performed like resampling, rotation, warping, panning, and rescaling, all at real-time video rates. 2D filtering operations, like pixel convolutions, can also be performed. In most applications two LF2301s are used, one to generate the row addresses and the other to generate the column TABLE 1. MODE SELECTION M1 M0 MODE 0 0 single-pass operation (CW) 0 1 pass 1 of two-pass operation 1 0 single-pass operation (CCW) 1 1 pass 2 of two-pass operation TABLE 2. KERNEL K3 K2 K1 K0 Kernel 00 00 1 x 1 00 01 2 x 2 00 10 3 x 3 00 11 4 x 4 01 00 5 x 5 01 01 6 x 6 01 10 7 x 7 01 11 8 x 8 10 00 9 x 9 10 01 10 x 10 10 10 11 x 11 10 11 12 x 12 11 00 13 x 13 11 01 14 x 14 11 10 15 x 15 11 11 16 x 16 |
Ähnliche Teilenummer - LF2301 |
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Ähnliche Beschreibung - LF2301 |
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