• Proceedings of the KIEE Conference
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• 2003.11c
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• pp.608-611
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• 2003

A large part of the embedded system, compared with the PC, have low performance CPU and small memory. So the embedded operating system fits the condition of that hardware system. A Single Address Space (SAS) OS has the operating system and all applications in the single address space. The SAS architecture enhances sharing and co-operation, because addresses have a unique interpretation. Thus, pointer-based date structures can be directly communicated and shared between programs at any time, and can be stored directly on storage. The key point of the SAS OS on the embedded system is the low overhead inter-action between programs in process and usage. So SAS OS can be ported on the low performance CPU. In this paper, we design the SAS OS (named emNOS, Embedded Network Operating System) on the ARMTTDMI processor. Finally we show the benefits of the SAS OS on the embedded system.

• Proceedings of the IEEK Conference
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• 2002.06b
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• pp.349-352
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• 2002

In this Paper, we introduced 32 bit SOC implementation for multi-application Smart Card and described the methodology for reducing power consumption. It consists of ARMTTDMI micro-processor, 192 KBytes EEPROM, 16 KB SRAM, crypto processors and card reader interface based on AMBA bus system. We used Synopsys Power Compiler to estimate and optimize power consumption. Experimental results show that we can reduce Power consumption up to 62 % without increasing the chip area.

• Proceedings of the IEEK Conference
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• 2002.06b
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• pp.325-328
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• 2002

In this paper, we present a SystemC model of a 32-Bit RISC core wi)ich is based on the ARMTTDMI architecture. The RISC core model was first modeled in C for architecture verification and then refined down to a level that allows concurrent behavior lot hardware timing using the SystcmC class library. It was driven in timed functional level that uses handshake protocol. It was compiled using standard C++ compiler. The functional simulation result was verified by comparing the contents of memory, the result of execution with the result from the ARMulator of ADS(Arm Developer Suite).

• Proceedings of the IEEK Conference
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• 2001.06e
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• pp.47-50
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• 2001

Nowadays ARM7 core is used in many fields such as PDA systems because of the low power and low cost. It is a general-purpose processor, designed for both efficient digital signal processing and controller operations. But the advent of the wireless communication creates a need for high computational performance for signal processing. And then This paper has been designed a floating-point multiplier compatible to IEEE-754 single precision format for ARMTTDMI performance improvement.

• Proceedings of the IEEK Conference
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• 2002.06a
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• pp.375-378
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• 2002

This paper describes tile design and implementation of contact and contactless If card OS(Operating System) for Java Card, namely JCOS(Java Card 05). The JCOS complies with ISO/IEC 7816 and IS0/1EC 14443 standards. The JCOS conforms to Java Card 2.1.2 specifications. The JCOS is running on 32-bit ARMTTDMI with public key crypto-coprocssor. This paper describes only the dual-interface protocol of the JCOS which supports contact and contactless applications in a single chip. The JCOS has been completed with our sample banking service and access control service in ETRI up to now.