Dynamically Reconfigurable FIR Filter Architectures with Fast Reconfiguration
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1 Dynamically Reconfigurable FIR Filter Architectures with Fast Reconfiguration Martin Kumm, Konrad Möller and Peter Zipf University of Kassel, Germany
2 FIR FILTER Fundamental component in digital signal processing Computationally complex due to numerous multiply/ accumulate operations 2
3 WHY RECONFIGURATION? Many applications require the change of coefficients......but only from time to time Possibility to reduce complexity 3
4 METHODS OF RECONFIGURATION 1. Integrating multiplexers into the design 2. Partial reconfiguration (e.g., using ICAP) 3. Reconfigurable LUTs 4
5 MULTIPLEXER BASED RECONFIGURATION Multiplexers are integrated in add/shift networks Extremly fast reconfiguration (single clock cycle) Only a limited set of coefficients possible! [Faust et al. 10] 5
6 PARTIAL RECONFIGURATION Partial regions of the FPGA are reconfigured via ICAP Least resources Arbitrary coefficients but synthesis needed for each coefficient set Slow reconfiguration ( μs/ms)! 6
7 RECONFIGURABLE LUTS Changing the LUT content only Routing has to be fixed First academic tool available (TLUT flow, [Bruneel et al. 11]) Fast reconfiguration (a few clock cycles, ns/μs) Arbitrary coefficients but (again) synthesis needed for each coefficient set Not, if a generic architecture is transformed to fixed routing 7
8 RECONFIGURABLE LUTS FPGA components to realize reconfigurable LUTs Older Xilinx FPGAs (Virtex 1-4): Shift-Register LUT (SRL16) Newer Xilinx FPGAs (Virtex 5/6, Spartan 6, 7-Series): CFGLUT5 (similar to SRLC32E but with two output functions) Other FPGA vendors: Distributed RAM or block RAM 8
9 METHODS OF RECONFIGURATION 1. Integrating multiplexers into the design Logic fixed, routing flexible 2. Partial reconfiguration (e.g., using ICAP) Logic flexible, routing flexible 3. Reconfigurable LUTs Logic flexible, routing fixed 9
10 LUT BASED FIR FILTER Two well-known methods that employ LUTs in a fixed structure, suitable for FIR filters: 1. Distributed Arithmetic [Crosisier et al. 73] [Zohar 73] [Kumm et al. 13] 2. LUT based multipliers [Chapman 96] [Wiatr et al. 01] 10
11 The main question is: "Which architecture performs best? 11
12 DISTRIBUTED ARITHMETIC Main idea is rearranging the underlying inner product Resulting function (realized as LUT) is identical for each bit b Less configuration memory y = c x = = = N 1 n=0 N 1 n=0 B x 1 b=0 c n x n B x 1 c n b=0 N 1 2 b n=0 2 b x n,b c n x n,b =f( x N b )(LUT) x N b =(x 0,b,x 1,b,...,x N 1,b ) T 12
13 DISTRIBUTED ARITHMETIC OVERALL ARCHITECTURE Pre-processing to exploit coefficient symmetry 13 Output adder tree Reconfigurable LUTs Reconfiguration circuit
14 DISTRIBUTED ARITHMETIC MAPPING TO CFGLUT5 14
15 LUT MULTIPLIER FIR FILTER Basic Idea: Split a multiplication into smaller chunks which fit into the FPGA LUT: c n x n B c B x mult. L 1 = c n b=0 2 b x n,b B c L mult. L 1 +2 L c n b=0 2 b x n,b+l B c L mult
16 LUT MULTIPLIER MAPPING TO CFGLUT5 16
17 LUT MULTIPLIER OVERALL ARCHITECTURE Replaced by reconfigurable multipliers 17
18 CONTROL ARCHITECTURE 18
19 RESOURCE COMPARISON Distributed Arithmetic LUT Multiplier FIR LUTs with inputs B x +1 M M LUTs with inputs B x CFGLUTs: (B x + 1) M/4B c / (B x + 1)M(B c /2 + 1) CFGLUTs: M B x /4B c / B xm(b c /2 + 2) M = N/2 : No. of unique taps B x /B c : input/coefficient bit width 19
20 RESOURCE COMPARISON Distributed Arithmetic LUT Multiplier FIR LUTs with inputs B x +1 M M LUTs with inputs B x CFGLUTs: (B x + 1) M/4B c / (B x + 1)M(B c /2 + 1) CFGLUTs: M B x /4B c / B xm(b c /2 + 2) Surprisingly, CFGLUT requirements are very similar! 20
21 RESOURCE COMPARISON Distributed Arithmetic LUT Multiplier FIR Adders: Adders: M + B x +(B x + 1) M/4 2M 1+M B x /4 So, LUT multiplier based FIR filters are better when... 2M 1+MB x /4 <M+ B x +(B x + 1)M/ M 1 <B x...,i.e., the input word size B x is greater than approximately half the number of coefficients 21 M = N/2
22 RESULTS: 1ST EXPERIMENT Synthesis experiment for Virtex 6 Nine benchmark filters with length N= Input word size B x {8, 16, 24, 32} Very fast reconfiguration times: ns High clock frequencies: 472 MHz/494 MHz (DA/LUT mult.) 22
23 RESULTS: 1ST EXPERIMENT LUT Multiplier improvement compared to DA: Slice improvement [%] Slice improvement [%] Filter length N Filter length N (a) Input word size B x =8bit (b) Input word size B x =16bit Slice improvement [%] Slice improvement [%] Filter length N Filter length N (c) Input word size B x =24bit (d) Input word size B x =32bit As expected, the LUT multiplier architecture is best for low N 23
24 RESULTS: 1ST EXPERIMENT LUT Multiplier improvement compared to DA: Slice improvement [%] Slice improvement [%] Filter length N Filter length N (a) Input word size B x =8bit (b) Input word size B x =16bit Slice improvement [%] Slice improvement [%] Filter length N Filter length N (c) Input word size B x =24bit (d) Input word size B x =32bit Choosing the right architecture can save up to 40% slices 24
25 RESULTS: 2ND EXPERIMENT Comparison with partial reconfiguration via ICAP Ten different filters with N=41 were highly optimized using PMCM optimization RPAG [Kumm et al. 12] Method S [bit] Slices f clk [MHz] T rec [ns] RPAG with ICAP Reconf. FIR DA Reconf. FIR LUT Configuration memory is reduced by a factor of 1/388 (DA) and 1/50 (LUT Mult.) 25
26 RESULTS: 2ND EXPERIMENT Comparison with partial reconfiguration via ICAP Ten different filters with N=41 were highly optimized using PMCM optimization RPAG [Kumm et al. 12] Method S [bit] Slices f clk [MHz] T rec [ns] RPAG with ICAP Reconf. FIR DA Reconf. FIR LUT Slice requirements are roughtly doubled 26
27 RESULTS: 2ND EXPERIMENT Comparison with partial reconfiguration via ICAP Ten different filters with N=41 were highly optimized using PMCM optimization RPAG [Kumm et al. 12] Method S [bit] Slices f clk [MHz] T rec [ns] RPAG with ICAP Reconf. FIR DA Reconf. FIR LUT Perfomance is similar 27
28 RESULTS: 2ND EXPERIMENT Comparison with partial reconfiguration via ICAP Ten different filters with N=41 were highly optimized using PMCM optimization RPAG [Kumm et al. 12] Method S [bit] Slices f clk [MHz] T rec [ns] RPAG with ICAP Reconf. FIR DA Reconf. FIR LUT Reconfiguration time is drastically reduced by a factor of 1/3556! 28
29 CONCLUSION Two different reconfigurable FIR filter architectures for arbitrary coefficient sets were analyzed Both are implemented using reconfigurable LUTs (CFGLUTs) The LUT multiplier architecture typically needs less slices when input word size is greater than approx. half the number of coefficients (and vice versa) Both architectures offer reconfiguration times of about 3500 times faster than partial reconfiguration using ICAP This is paid by twice the number of slice resources 29
30 RECOSOC CONCLUSION If you have a reconfigurable FPGA circuit which allows a fixed routing: Use reconfigurable LUTs! 30
31 THANK YOU!
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