COP - DSP FUNCTIONS

DSP Functional Building Blocks
The goal of this section is to cover the history of long story DSP functional blocks. As its name implies, this type of block is opposed to DSP structural block such as (bit/byte/word  slice logic).  

BACKGROUND

Let us give a special mention to the CAFIR (a FIR filter from motorola 1986) and the C66xx FTT Engine (TI 2010) and to our friends of the Morphics Next Gen.

LIST OF FUNCTIONS

• Filters
• including equalizers
• FFTers
• bit reverse (!!)
• Convolvers
• Bit convolvers and Gallois field arithmetic
• Hats off to unsung heroes of 30 years of custom DSP (see for instance ISSCC 1980-now)

FILTERS

DSP56200 also known as CAFIR (Motorola 1987)  [ref. 1]
- Main function is adaptive filtering using LMS .
- 256 x 24-bit coef RAM
- 256 x16-bit data  RAM
Can be configured as single FIR, dual FIR or Single adaptive FIR
Programmable loop gain in adaptive Mode
Programmable coef. leakage term.

REFERENCES

 

1. Motorola " DSP56200  data sheet", 1988,also called ADI1257R1
2. Hossein Yassaie  "Digital filtering with the IMS A100" Inmos 1986
   
3. FUJITSU " MB86795 data sheet" ,  aug 1987
4. Atmel "ATC 76C001 programmable FIR filter", 1996
5. Amphion " Cascadable FIR", Quicklogic, 2001
6. ISS "Biquad IIR filter megafunction" Altera, 200
7. see Xilinx, Altera etc.. Catalogues
8. Jordan, mannock "Correlation-function, peak detector",  IEE Proc., March 1981
9. Tao Lin, Dahn Le ngoc" Implementation of digital filters using IDT7320, IDT7210, IDT7216, and IDT7383" IDT A.N  AN-32, 1990