SUNY Poly CS 521 - Reconfigurable Computers (28 pages)

Previewing pages 1, 2, 3, 26, 27, 28 of 28 page document View the full content.
View Full Document

Reconfigurable Computers



Previewing pages 1, 2, 3, 26, 27, 28 of actual document.

View the full content.
View Full Document
View Full Document

Reconfigurable Computers

54 views


Pages:
28
School:
SUNY Polytechnic Institute
Course:
Cs 521 - Operating Systems
Unformatted text preview:

Reconfigurable Adaptable Systems OS Charles Huntington Michelle Grieco Reconfigurable Adaptable Systems OS reconfigures its resource management policies based on application needs System adjust components change and OS must Reconfigurable OS in Dynamically Reconfigurable Operating Systems include Trends Plug Hot and Play Swappable Devices PCMCIA and USB devices Object Oriented Operating Systems Legacy Devices Prior to 1995 traditional computer cards had to be manually configured This type of hardware is categorized as legacy devices The hardware came with dip switches and or jumpers to configure their settings The problem A user had to understand extensively how their computer s resources were allocated to setup new hardware Another problem A legacy device s default settings caused conflicts in resource allocation ex sound cards network adapters IRQ 5 Plug and Play Devices now work out of the box Plug and Play Microsoft Intel and a few other hardware manufacturers developed the Plug and Play PnP standard to combat the problems with Legacy Devices A PnP OS stores the device drivers for many peripheral devices PnP works with the BIOS to determine the necessary resources for new hardware How PnP works The BIOS first searches the PCI and ISA busses to determine if the current hardware matches the existing configuration If the configuration has changed then the BIOS will assign resources to the legacy devices first The PnP devices are update with the leftover resources The ESCD Extended System Configuration Data is updated with the new configuration settings PnP Problems After Windows 95 was out problems with PnP became apparent Stubborn IRQ assignments PnP could Plug not handle the complicated jobs and Pray Hot Swapping Hot Swapping is the act of connecting disconnecting a device without stopping the host operations Hot Swapping requires specially designed hardware and software Hot Swapping requires that both the OS and the connecting peripheral support it USB Universal USB Serial Bus is truly a PnP connector is very fast with a maximum bandwidth of 12 Mbps USB is Hot Swappable Reconfigurable OS Dynamic Reconfiguration of OS using Objects Traditional systems use fixed management policies They can not expand or contract in order to run under new hardware environments They can not implement a new feature just because the hardware made it available Dynamic reconfiguration welcomes new implementations of hardware where traditional OS ignore it Reconfiguration of OS using Objects One example of an OO Reconfigurable OS is Choices Choices can run on many different hardware platforms Choices uses three main abstract classes MemoryObject Process and Domain These classes define the rest of the OS Choices steps to a new OS The automatic development of a subframework like a file system is handled in the following manner The abstract properties of the subsystem are collected file permissions containing data structure and compression techniques A subframework is developed that is consistent with the absract properties and the lower level requirements Finally a subsystem is created with concrete classes that exemplifies the subframework Choices three abstract classes Choices constraints Choices subframework Reconfigurable System Components Wearable Reconfigurable Computers Quantum3D Requirements Occasionally execute bursts of computation intensive tasks that carry real time constraints reading sensor position cryptography and communication high energy efficiency and performance Fixed base performance for running tasks that have neither high computation demands nor stringent timing constraints Low power consumption force components into powerdown modes Highly flexible components of systems are dynamically added put on or removed from the body system Adapt to emerging changing communication standards protocols High Performance Reconfigurable Computer Systems Example Wearable Configurable Systems Embedded into mobile environment that interacts with to events occurring in the area Composed of a set of distributed nodes and a communication network surrounded by a general purpose main module Performance intensive parts are implemented in FPGAs reconfigurable but the system also contains low power CPUs Wireless is the predominant technology of communication with outside networks FPGAs Field Programmable Gate Arrays Programmable logic blocks which are interconnected by programmable routing channels SRAM based cells control the functionality of the logic blocks and routing Reprogrammed in circuit arbitrarily by downloading configuration data to the device Components of Reconfigurable Systems Sensors Interface Reconfigurable Hardware Memory CPU Wireless Link Integration of CPU and FPGAs allows for low latency and low power communication Energy savings of moving kernels to FPGA instead of CPU Computation intensive functions are loaded into reconfigurable hardware as needed It can also run communication function protocol functions to relieve the CPU The reconfigurable hardware is known as ASIC on demand Application Specific Integrated Circuit a chip designed for a particular application as opposed to the integrated circuits that control functions such as RAM in a PC ASICs are built by connecting existing circuit building blocks in new ways Since the building blocks already exist in a library it is much easier to produce a new ASIC than to design a new chip from scratch Reconfigurable System Software Architecture Application Tasks System Tasks Operating System CPU Reconfigurable Hardware Memory I O Pros Cons of High Performance Reconfigurable Computing Pros Cons Exponential Programming improvement of capabilities and performance using FPGAs Flexibility Modest Cost HP computers is time consuming Must be expert in parallel computing architecture programming tools and target application Reconfigurable Systems Demand paged hardware similar to virtual memory used for software Each computation task can be supported by the notion of virtual hardware Different hw tasks could share portions of the FPGA physically or temporally and operate like a hardware cache By using the reconfigurable components as virtual hardware fewer resources are needed for an application since the RC units can be dynamically reconfigured and reused to implement multiple functions References Supporting Dynamic Reconfiguration of Operating System using Object and Meta Objects Yoo Kwanghun and Choo Yookun Department of Computer Engineering


View Full Document

Access the best Study Guides, Lecture Notes and Practice Exams

Loading Unlocking...
Login

Join to view Reconfigurable Computers and access 3M+ class-specific study document.

or
We will never post anything without your permission.
Don't have an account?
Sign Up

Join to view Reconfigurable Computers and access 3M+ class-specific study document.

or

By creating an account you agree to our Privacy Policy and Terms Of Use

Already a member?