中英文资料-模拟单片机外设的高级共仿真和综合

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浙江工业大学浙西分校信电系系毕业论文(中英文资料)

Modeling micro-controller peripherals

for high-level co-simulation and synthesis

Mapping a behavior on an embedded system involves hardware-software

partitioning and assignment of software and hardware tasks to different components.

In particular, software tasks in embedded controllers are mostly assigned to a micro-

controller. However, some micro-controller peripherals are implemented with partly

programmable components that can be regarded as very simple co-processors with

limited instruction sets and capabilities. Embedded system designers are used to

mapping some simple software tasks onto these simple co-processors, obtaining

overall performances that can be orders of magnitude superior to the ones obtained

mapping all software tasks to the micro-controller itself. In this paper, we propose a

methodology to specify, simulate, and partition tasks that can be implemented on

programmable micro-controller peripherals such as Timing Processing Units P U S ) .

Following our general philosophy, we let the designer propose a partition, and we

provide an environment 0 to efficiently simulate and evaluate a particular

implementation choice 0 to automate downstream synthesis for software, hardware, as

well as peripheral programming routines.

1 Implementation and Case Study

We have implemented such a library for the 68hcll family of micro-controllers

from Motorola . It includes: 0 The timer unit, implementing input capture and output

compare functions, that measure time between input and 0 The ALII convert output

events using a 16 bit free running counter. 0 The PWM generators present on a

specific family member targeted for automotive applications.

Each function of the timer unit and of the PWM generator is described both at

the behavioral level, using the simulator timing functions to implement time, and at

the Register Transfer level, using a cycle-accurate model of the hardware. The latter is

also used for hardware and software synthesis, if the peripheral is not used. C routines

are used to interface to the peripheral. The precision of the RTL model can be scaled,

by dividing the clock. A single simulation parameter controls this scaling without

affecting the overall behavior (apart from the loss of precision).

We have specified the functionality of a complete dashboard controller, that uses

the 68hcl1 peripherals. Note, with the standard co-design methods, using only fully

programmable processors or hardware, all the tasks implemented by the peripherals

could be implemented only as software tasks, thus yielding a less performing solution,

or as hardware tasks, thus yielding a higher cost and less flexible solution. Hence the

method presented here is required in order to obtain a solution quality comparable

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摘要：

浙江工业大学浙西分校信电系系毕业论文(中英文资料)Modelingmicro-controllerperipheralsforhigh-levelco-simulationandsynthesisMappingabehavioronanembeddedsysteminvolveshardware-softwarepartitioningandassignmentofsoftwareandhardwaretaskstodifferentcomponents.Inparticular,softwaretasksinembeddedcontrollersaremostlyassignedtoamic...

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