Kabushiki Kaisha Toshiba

Mikio Takasugi

Atsushi Kunimatsu

Shigeaki Iwasa

Toshiyuki Yaguchi

Hiroyuki Takai

Seiji Koino

Hiroki Fujimura

The present invention is to provide an emulator and a method of emulation for using testing a system having complex interfaces capable of stable testing can be realize under the system regulation frequency or less frequency without using the high-performance and expensive tester. The emulator comprises a content addressable memory (CAM) configured to store addresses accessed by a system to be tested, a memory unit having storage area corresponding to the entry of the CAM, configured to store data corresponding to the address stored in the CAM, and test information for emulation, a shift register configured to store data and test information from a tester and transfer the data and the test information to the CAM and the memory unit, and a state machine configured to receive a request from a system or a tester and control transferring between a system and a tester.

Emulator, a data processing system including an emulator, and method of emulation for testing a system

An instruction code is received by an instruction input section 103 and then decoded by the instruction decode section 105 to generate an operand and control signals. The instruction division control section 109 generates a division control signal based on the control signals and an operand selection section 107 generates an operand having a desired bit width by using the operand from the instruction decode section 105 based on the division control signal. An arithmetic section 111 divides the operand into a desired bit width parts based on the division control signal and performs arithmetic operation. A memory access control section 115 receives calculated address and transfers this calculated address and the division control signal to a memory. The memory access control section 115 receives data from the memory and transfers the data into the arithmetic result store section 113.

Processor architecture with divisional signal in instruction decode for

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Kanagawa-ken, Japan

Mikio Takasugi