Abstract: A semiconductor integrated circuit device is provided having a low-amplitude input/output interface for inputting or outputting an input/output signal synchronously with a clock signal and transferring the input/output signal with an amplitude corresponding to a power supply voltage to or from an external command unit. A first differential circuit to be practically continuously operated is used as an input circuit for receiving a clock signal supplied from an external clock unit. In addition, a second differential circuit is provided which is intermittently operated in accordance with the clock signal to sample an input signal in accordance with an internal clock signal generated by the first differential circuit while the second differential circuit is operated and holds the sampled signal while the second differential circuit is not operated. This second differential circuit is used as an input circuit for receiving a low-amplitude input signal inputted synchronously with the clock signal.

Abstract: A semiconductor memory incorporating an operation circuit for carrying out logical operations on data and arithmetic operations on address signals. The memory is arranged functionally so that the data representing the result of each of such operations is written to a memory array while also being output through an external terminal in the same memory cycle.

Abstract: A multiport memory is provided which permits both random access and serial access. In order to reduce parasitic capacitance and improve operating speed, the serial input/output lines are each divided into two parts at their middle points. Sense amplifiers for the serial input/output lines are provided at upper and lower ends of the serial access memory elements to respectively amplify signals from the divided lines. Additional features are provided for improving both the serial and random operation. For example, during the serial read mode, the column selector for random access is simultaneously operated, and read data passing through the random access column selector is used as head data for the serial output operation to be delivered through the serial output circuit. Also, a serial selector can be controlled by a select signal formed by a Gray Code counter to improve operating speed.

Abstract: A multiport memory is provided which permits both random access and serial access. In order to reduce parasitic capacitance and improve operating speed, the serial input/output lines are each divided into two parts at their middle points. Sense amplifiers for the serial input/output lines are provided at upper and lower ends of the serial access memory elements to respectively amplify signals from the divided lines. Additional features are provided for improving both the serial and random operation. For example, during the serial read mode, the column selector for random access is simultaneously operated, and read data passing through the random access column selector is used as head data for the serial output operation to be delivered through the serial output circuit. Also, a serial selector can be controlled by a select signal formed by a Gray Code counter to improve operating speed.

Abstract: The present invention disposes a redundancy logic device and a redundancy line which are used selectively in place of a logic device or a line, which becomes unusable, in a logic portion of a semiconductor integrated circuit device such as a gate array integrated circuit.

Abstract: A multi-port memory is provided which is capable of being backed up by a battery to provide a resume function for a digital processor. In a preferred embodiment, a resume function can be provided for a VRAM without restricting the bit rate of image data or the function of the frame memory. Preferably, the memory includes a memory array MARY of memory cells of stereoscopic structure. A high voltage VCH for word line selection can be generated by a voltage-doubling word boost circuit which has its boosting ratio switched stepwise in accordance with the potential of an internal supply voltage. Moreover, a substrate potential generator is provided which has a first substrate potential generator having a relatively low current supplying capacity, which is steadily brought into an operative state, and a second substrate potential generator having a relatively high current supplying capacity which is selectively brought into an operative state.

Abstract: A multiport memory is provided which permits both random access and serial access. In order to reduce parasitic capacitance and improve operating speed, the serial input/output lines are each divided into two parts at their middle points. Sense amplifiers for the serial input/output lines are provided at upper and lower ends of the serial access memory elements to respectively amplify signals from the divided lines. Additional features are provided for improving both the serial and random operation. For example, during the serial read mode, the column selector for random access is simultaneously operated, and read data passing through the random access column selector is used as head data for the serial output operation to be delivered through the serial output circuit. Also, a serial selector can be controlled by a select signal formed by a Gray Code counter to improve operating speed.

Abstract: A multiport memory is provided which permits both random access and serial access. In order to reduce parasitic capacitance and improve operating speed, the serial input/output lines are each divided into two parts at their middle points. Sense amplifiers for the serial input/output lines are provided at upper and lower ends of the serial access memory elements to respectively amplify signals from the divided lines. Additional features are provided for improving both the serial and random operation. For example, during the serial read mode, the column selector for random access is simultaneously operated, and read data passing through the random access column selector is used as head data for the serial output operation to be delivered through the serial output circuit. Also, a serial selector can be controlled by a select signal formed by a Gray Code counter to improve operating speed.

Abstract: A semiconductor integrated circuit which has the function of self-checking defective bits, and which informs the exterior of its status when it has reached the status incapable of self-repair due to the limitation of the storage capacity of hardware for repairing the defective bits.

Abstract: A multiport memory is provided which permits both random access and serial access. In order to reduce parasitic capacitance and improve operating speed, the serial input/output lines are each divided into two parts at their middle points. Sense amplifiers for the serial input/output lines are provided at upper and lower ends of the serial access memory elements to respectively amplify signals from the divided lines. Additional features are provided for improving both the serial and random operation. For example, during the serial read mode, the column selector for random access is simultaneously operated, and read data passing through the random access column selector is used as head data for the serial output operation to be delivered through the serial output circuit. Also, a serial selector can be controlled by a select signal formed by a Gray Code counter to improve operating speed.