LF2250

The LF2250 is a high-speed matrix multiplier consisting of an array of nine 12 x 10-bit multipliers.  Internal  summing adders are also included to provide the configurations needed to implement matrix multiplications, cascadable FIR filters, and pixel convolvers.

The 3 x 3 matrix multiplier (triple dot product) configuration of the LF2250 allows users to easily perform three- dimensional perspective translations or video format conversions at real-time video rates.  By using the LF2250 in this configuration, conversions can be made from the RGB (color component) format to the YIQ (quadrature encoded chrominance) or YUV (color differ- ence) formats and vice versa (YIQ or YUV to RGB).

In addition to color space conversions, the LF2250 offers a range of selectable configurations designed for filtering applications.  When configured as a 9-tap FIR filter, the LF2250 automatically selects the necessary internal bus structure and inserts the appropriate data path delay elements.  In addition, a 16-bit cascade input port allows for the creation of larger filters without a reduction in throughput.

Real-time video image filtering using the convolver modes of the LF2250 can provide edge detection, texture enhancement, and detail smoothing. Both pixel convolver configurations, 3 x 3 and 4 x 2, deliver high-speed data manipulation in a single chip solution.By using the 16-bit cascade input port to cascade two devices, cubic convolu-tions (4 x 4-pixel) can be easily accom-modated with no decrease in through-put rates.

All inputs and outputs, as well as all control lines, are registered on the rising edge of clock.  The LF2250 operates at clock rates up to 50 MHz over the full commercial temperature and supply voltage ranges.