SIMPLY INTERFACED SEMICONDUCTOR INTEGRATED CIRCUIT DEVICE INCLUDING LOGIC CIRCUITRY AND EMBEDDED MEMORY CIRCUITRY

摘要

An interface circuit performs supply/reception of data with a register instead of supply/reception of data with DRAM when an area specified by an address signal is a logic control area. Data signals in the case are a control command for a logic circuit held in a register and input data to be processed. The logic circuit takes charge of a critical path in processing time such as cryptographic processing and image processing. A processing result is held in the register. The register circuit switches between storage data stored in DRAM and data given from a terminal group to select data to be processed according to a control signal.