DESCRIPTION
Input data is 8 bits and coefficient data is 12 bits and both are in two’s complement format. The filter is an 8-tap FIR filter with all required line buffers contained onchip. The line buffers can store video lines with lengths from 4 to 3076 pixels. Multiple LF3338s can be cascaded together to create larger vertical filters. Due to the length of the line buffers, interleaved data can be fed directly into the device and filtered without separating the data into individual data streams. The number of interleaved data sets that the device can handle is limited only by the length of the on-chip line buffers. If the interleaved video line has 3076 data values or less, the filter can handle it. The LF3338 contains enough on-board memory to store 256 coefficient sets. The LF InterfaceTM allows all 256 coefficient sets to be updated within vertical blanking. Selectable 16-bit data output with user-defined rounding and limiting minimizes the constraints put on coefficient sets for various filter implementations.
LOGIC Devices Incorporated
