From: couturie Date: Wed, 19 Oct 2011 18:33:18 +0000 (+0200) Subject: qlq modifs X-Git-Url: https://bilbo.iut-bm.univ-fcomte.fr/and/gitweb/dmems12.git/commitdiff_plain/d343834383c4f75427f0864fa81669d0968e6aaf?ds=inline qlq modifs --- diff --git a/dmems12.tex b/dmems12.tex index 93d7fbc..c3d00f4 100644 --- a/dmems12.tex +++ b/dmems12.tex @@ -278,15 +278,13 @@ some hardware constraints specific to FPGAs. \section{Proposed solution} \label{sec:solus} -Project Oscar aims to provide an hardware and software architecture to -estimate and control the deflection of cantilevers. The hardware part -consists in a high-speed camera, linked on an embedded board hosting -FPGAs. By the way, the camera output stream can be pushed directly -into the FPGA. The software part is mostly the VHDL code that -deserializes the camera stream, extracts profile and computes the -deflection. Before focusing on our work to implement the phase -computation, we give some general informations about FPGAs and the -board we use. +Project Oscar aims to provide a hardware and software architecture to estimate +and control the deflection of cantilevers. The hardware part consists in a +high-speed camera, linked on an embedded board hosting FPGAs. By the way, the +camera output stream can be pushed directly into the FPGA. The software part is +mostly the VHDL code that deserializes the camera stream, extracts profile and +computes the deflection. Before focusing on our work to implement the phase +computation, we give some general information about FPGAs and the board we use. \subsection{FPGAs} @@ -295,23 +293,23 @@ configured by the customer. A hardware description language (HDL) is used to configure a FPGA. FGPAs are composed of programmable logic components, called logic blocks. These blocks can be configured to perform simple (AND, XOR, ...) or complex combinational functions. Logic blocks are interconnected by -reconfigurable links. Modern FPGAs contains memory elements and multipliers -which enables to simplify the design and increase the speed. As the most complex -operation operation on FGPAs is the multiplier, design of FGPAs should not used -complex operations. For example, a divider is not an available operation and it -should be programmed using simple components. +reconfigurable links. Modern FPGAs contain memory elements and multipliers which +enable to simplify the design and to increase the speed. As the most complex +operation on FGPAs is the multiplier, design of FGPAs should use simple +operations. For example, a divider is not an operation available and it should +be programmed using simplest operations. FGPAs programming is very different from classic processors programming. When -logic block are programmed and linked to performed an operation, they cannot be -reused anymore. FPGA are cadenced more slowly than classic processors but they can -performed pipelined as well as parallel operations. A pipeline provides a way -manipulate data quickly since at each clock top to handle a new data. However, -using a pipeline consomes more logics and components since they are not -reusable, nevertheless it is probably the most efficient technique on FPGA. -Parallel operations can be used in order to manipulate several data +logic blocks are programmed and linked to perform an operation, they cannot be +reused anymore. FPGAs are cadenced more slowly than classic processors but they +can perform pipeline as well as parallel operations. A pipeline provides a way +to manipulate data quickly since at each clock top it handles a new +data. However, using a pipeline consumes more logics and components since they +are not reusable. Nevertheless it is probably the most efficient technique on +FPGA. Parallel operations can be used in order to manipulate several data simultaneously. When it is possible, using a pipeline is a good solution to manipulate new data at each clock top and using parallelism to handle -simultaneously several data streams. +simultaneously several pipelines in order to handle multiple data streams. %% parler du VHDL, synthèse et bitstream \subsection{The board}