A Layered Formal Specification of Contactless IC Card "FeliCa"

1
A Layered Formal Specification of Contactless IC
Card "FeliCa"

• Kyushu University (JAPAN)
• Xiaojing ZHANG, Yoichi OMORI and Keijiro ARAKI

• Background
• Consumer embeddedsystems
• Product family development
• Short interval between releases
• Similar service with variable platform
• Software productline
• Extracts commonalities of a series of products
• Manage and improve core asset

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• Feedback process from product to core asset is
  complicate
• Product is complicatedly mixed
• Which part should we feedback to the core asset?
• Formal specifications help clarifying
  commonalities and differences
• Purpose
• Propose a layered architecture of specification
• To improve efficiency of the feedback process
• Approach
• Separate descriptions between logical and
  physical level by hardware dependency
• Apply to Contactless IC card "FeliCa

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SoftwareProduct
Core Asset
reuse
feedback
Logical Layer(common components)

separation
specification innatural language
Physical Layer(variable components)
Layered Architecture
Figure1 Concept Of Research
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• Method
• Layered architecture
• Logical layer
• preserved data with logical meaning
• Operations derived from design purpose
• Physical layer
• Physical structure of data
• Algorithms or procedure of operations
• Divide natural language specification into
  several modules
• separate each module into Logical Layer and
  Physical Layer by principles above
• Draw class diagrams in UML, and then materialize
  them to VDM
• Inheritance are used temporarily
• Gathering only physical descriptions cant make
  the layer complete
• To make up shortage To indicate correspondency

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• Case Study FeliCa Card
• Divide card into file system and commands
• File System data structure on card memory
• Data hold on the memory area
• Operations access the data
• Type of the data
• Operations about types
• Commands protocol between card and R/W
• Command/Response packet
• Command purpose
• Structure of packet
• Procedure of commands operation
• Future Works
• Improve and formalize the method
• How to express both independency and
  correspondency?

Logical Layer Class
Physical Layer Class
Logical Layer Class
Physical Layer Class
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Class ofLogical Layer
Class ofPhysical Layer
Module Command Polling
inheritance
File System
Figure2 Class Diagram Of Commands (partial)