1. Reconfigurable Computing University of Arkansas
Dr. Christophe Bobda
CSCE Department
University of Arkansas

2. Chapter 05
Applications (cont)

3. 4. Mechanical Control – Basics
Controller task is to influence the dynamic behavior of a plant
Inputs values for the plant depends on plant's outputs (Feedbacks)
A Plant is modeled as linear time invariant (LTI)-System
Controller is modeled as LTI-System
Time discretization
Scaling to fix-point
k, k+1, k+2 …sample points
T… sample period
tc… calculation time of controller
Plant
DAC
ADC
Controller
reference
value T k
k+1
k+2 t tc

4. 4. Basics U: Controller input, x: State, y: Output
A, B, C, D: Constant coefficient matrices
combine A,B,C,D to M,
represent computation as set of scalar products of
each row of M with v
combine A,B,C,D to M,
represent computation as set of scalar products of
each row of M with v

5. 4. DA-Implementation Scalar product: const. vec. a and var. vec. x
xi as w-bit fix-point
(here x just unsigned in [0,2[ ) 20
2-1
2-2
2-3 …
2-(w-1)
replace (2) in (1),
swap the sums
since xij is in {0,1}
right sum can have just 2n values
pre-compute it and store it in a 2n x w ROM as LUT

6. 4. Multi controller system
Many controller modules optimized for different operating regimes
Controllers have different structures not only different coefficients
Supervisor observes plant and determines best controller module
Multiplexer switches controller outputs

7. 4. Multi controller system – Use of reconfiguration
One slot solution

8. 4. Multi controller system – Use of reconfiguration
One slot implementation
Two-slot implementation

9. 4. Multi controller system – Use of reconfiguration
Reconfigurable
Module Slot
(Controller Module)
Fix Module Slot
(Supervisor)
Bus Macros

10. 5. Adaptive Cryptosystems
Sensitive data exchange is always coupled with the security issue
Cryptography provides a means to allow a secure data exchange
large variety of standards and protocols
Triple-DES, Advanced Encryption Standard(AES),
Data Encryption Standard (DES), RSA,
OpenPGP, CipherSaber,
IPsec, Blowfish, and RC6
Large variety of algorithm within standard
Key length
Operation basis
Multiplication algorithms

11. 5. Adaptive Cryptosystems
Benefit of reconfiguration
Flexibility: possibility to used to switch from one algorithm to the next one at run-time according to
The degree of security,
The computational speed
the power consumption
Performance
Ecplout the inherent parallelism within applications
Efficient computation of Boolean functions
Large throughput and a cost efficiency
Adaptivity:
Remove brocken algorithms
Insert new standards

12. 5. Adaptive Cryptosystems
System architecture

13. 6. Software Defined Radio
Term coined by Mitola in 1992
A radio communication system that use software to modulate and demodulate radio signals
Military: Project SPEAKeasy involving the DARPA, AIR FORCE/AFRL, ARMY/CECOM, NAVY/NRaD/SPAWAR, NSA
Goal:
move the analog-digital signal conversion as closer as possible to antenna process the digital signal in software rather than using a set of dedicated hardware components
Advantages
Flexibility: efficient shift of technology and resources
Adaptability: faster migration towards new standards and technologies through programmability and reconfiguration
Sustainability: increase resource utilization through generic hardware platforms
Reduced Ownership Costs: reduce infrastructure, lower maintenance cost, easier deployment

14. 6. Software Defined Radio
Architecture
Reconfigurable devices provide the best prerequisites for realizing SDR-Systems