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Introduction
In Constant Coefficient mode, a single coefficient set can be programmed into field programmable gate
array (FPGA) fabric. In Multiple Constant Coefficient mode, the multiple constant coefficient sets can be
programmed, and the FPGA stores all of them. It is possible to switch between the pre-loaded sets at any
moment during runtime, thus changing the filter impulse response. In Reloadable Coefficient mode, the
coefficients can be reloaded at the runtime.
Internal filter processing takes place at full precision to reduce truncation or rounding noise and to avoid a
risk of overflow. The filtered results are presented in full precision as well.
Figure 2 shows an example of using a FIR filter. Digital samples to be filtered enter the filter input and
filtered samples appear at the filter output.
Data to Be Filtered
CoreFIR
Filtered Data
Figure 2 · CoreFIR Example Application
Key Features
CoreFIR supports various filter types: Fully Enumerated, folded, and polyphase interpolator. The key
features for each type are listed in Table 1 .
Table 1 Key Feature Support
Feature
Number of filter coefficients
Fully Enumerated
2 to 2N, where N is a number of
Folded
4 to 1024
Interpolation
2 – 1,024
physically available MAC’s
Input data bit width
Coefficient bit width
Signed and unsigned data coefficients
Full precision output
Coefficient symmetry optimization
Constant coefficients and constant coefficient sets
Run-time reloadable coefficients
RAM-based coefficient storage
RAM-based data storage
2 – 18
2 – 18
Yes
Yes
Yes
Yes
Yes
No
No
2 – 18
2 – 18
Yes
Yes
No
Yes
Yes
Yes
Yes
2 – 18
2 – 18
Yes
Yes
No
Yes
Yes
Yes
Yes
The core supports SmartFusion 2 and IGLOO 2 FPGA families.
Supported Families
? ?
Core Version
This handbook applies to CoreFIR v8.5.
6
CoreFIR v8.5 Handbook
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