Xilinx V2.1 manual Block Parameters Dialog Box, Xilinx System Generator v2.1 Reference Guide

Xilinx System Generator v2.1 Reference Guide

Block Parameters Dialog Box

The block parameters dialog box can be invoked by double-clicking the icon in your Simulink model.

Figure 3-53: FIR block parameters dialog box

Parameters specific to the block are:

∙Coefficients: vector of filter coefficients; note that these can be evaluated from a MATLAB workspace variable and may in turn be computed by MATLAB. You can also refer to examples in the System Generator Tutorial.

∙Coefficient Structure: Xilinx Smart-IP core preferred implementation depends on the structure of the sequence of filter taps. You can choose one of these: inferred from coefficients, none, symmetric, negative symmetric, half band, and interpolate fir.

∙ Number of bits per coefficient: Xilinx fixed point parameter.

∙Binary point for coefficients: Xilinx fixed point parameter.

∙Coefficient arithmetic type: Xilinx fixed point parameter.

∙Number of Channels: One to eight, inclusive. For multi-channel filters, polyphase behavior is not supported, i.e. the filter must be single rate. The core, which processes the channels serially, will be overclocked by the System Generator by a factor equaling the number of channels so as to provide the necessary throughput. To reduce control logic overhead, the block requires that the valid bits match on all inputs.

80 Xilinx Development System