HSP45256_883

The Intersil HSP45256/HSP45256_883 is a high-speed, 256 tap binary correlator. It can be configured to perform one-dimensional or two-dimensional correlations of selectable data precision and length. Multiple HSP45256's can be cascaded for increased correlation length. Unused taps can be masked out for reduced correlation length.

The correlation array consists of eight 32-tap stages. These may be cascaded internally to compare 1, 2, 4 or 8-bit input  data with a 1-bit reference. Depending on the number of bits in the input data, the length of the correlation can be up to 256, 128, 64, or 32 taps. The HSP45256_883 can also be configured as two separate correlators with window sizes from 4 by 32 to 1 by 128 each. The Mask Register can be used to prevent any subset of the 256 bits from contributing to the correlation score.

The 9- output of the correlation array (correlation score) feeds the weight and sum logic, which gives added flexibility to the data format. In addition, an offset register is provided by HSP45256_883 so that a preprogrammed value can be added to the correlation score. This result is then passed through a user programmable delay stage to the cascade summer. The delay stage simplifies the cascading of multiple correlators by compensating for the latency of previous correlators.

The Binary Correlator is configured by writing a set of control registers via a standard microprocessor interface. To simplify operation, both the Control and Reference Registers are double buffered. This allows the user of HSP45256_883 to load new mask and reference data while the current correlation is in progress.