摘要:
A scan test circuit is provided with a scan chain having n pieces of scan storage elements (n: integer, n>1); a scan clock generation circuit which is able to control a frequency of a first clock to be used for shifting data into the first to (n−1)th scan storage elements, and a frequency of a second clock to be used for shifting data into the n-th scan storage element and performing actual operation, independently from each other; and a scan selection internal signal generation circuit for generating a scan selection internal signal that is synchronized with the second clock.
摘要:
A semiconductor integrated circuit includes a functional block realizing at least part of a function of the semiconductor integrated circuit. The functional block includes a plurality of basic cells and a plurality of terminal cells. Each of the plurality of terminal cells has a connector for mediating a communication between another semiconductor integrated circuit and one of the plurality of basic cells.
摘要:
Two instruction execution units execute different types of instructions. Two instruction selection circuits are provided. Two instruction buses are coupled to an instruction standby unit having predecoders and an instruction queue. The instruction standby unit is connected by two wait instruction buses to the input sides of the instruction selection circuits. An instruction fetch control circuit detects an instruction that has not been executed by any of the instruction execution units. Such an unexecuted instruction waits in the instruction queue, thereafter being applied, together with its predecode result, to each instruction selection circuit to be selected at the next selection time. As a result of such arrangement, fast execution of different types of instructions in parallel is accomplished.
摘要:
A pair of recording heads are mounted on a rotary cylinder for recording a video signal in slanted tracks on magnetic tape. The recording heads are mounted in a common plane and each has a different azimuthal angle. A pair of reading heads are mounted on the same rotary cylinder for reading the video signal recorded on the magnetic tape. The reading heads are mounted in a plane offset from the plane of the recording heads and have azimuthal angles that match the azimuthal angles of the recording heads. A mixing circuit mixes a component of the video signal ready from the magnetic tape by one of the recording heads with a video signal from a video signal source to generate a mixed video signal. The mixed video signal is returned to one of the recording heads for recordation on the magnetic tape.
摘要:
The processing apparatus in the present invention is a processing apparatus which executes a program and performs processes of the program, and includes the following: an execution circuit having a plurality of operation modes, each of which has a different effect on the processing performance and the power consumption of the processing apparatus; a measurement unit operable to measure at least one of a process execution performance and an execution power consumption of the processor circuit; and a control unit operable to compare a target value and a measurement result from the measurement unit, and to switch the operation modes in accordance to a result of the comparison.
摘要:
A cache access transmission means outputs an access address, obtained from a CPU by way of a local cache access address input means, to a shared address bus via a remote cache access address output means. A cache access control means accesses a cache memory by using the access address obtained from the shared address bus by way of a remote cache access address input means. That is, an access address output from a CPU of a first processor is output from the cache access transmission means and received by the cache access control means so as to be used in accessing a cache memory in a second processor.
摘要:
A processor that accesses a plurality of regions allocated to memory includes: a judging unit for judging which region is accessed based on an access address; an assuming unit for assuming which region is accessed based on the access address, the assuming unit producing an assumption result faster than the judging unit produces a judgement result; an accessing unit for starting access based on the assumption result; a detecting unit for detecting a disagreement between the judgement result and the assumption result; and a control unit for stopping the access that has been started if the detecting unit has detected the disagreement, and controlling the accessing unit to perform another access based on the judgement result.
摘要:
A first instruction requiring that a data word should be read out from a data memory and be stored in a certain register in a register set, and then a second instruction requiring that two operands, respectively read out from the register and another register in the register set, should be added are pipeline-processed. In a high-speed mode in which an operation clock having a higher frequency is supplied, a data cache intervened between an instruction execution circuit and the data memory is controlled to supply a data word to a WB (write back) stage of the instruction execution circuit within two cycles with respect to an input address associated with the first instruction. In order to execute the second instruction, the data word is supplied from the WB stage to an EX (operation execution) stage of the instruction execution circuit. In a low-speed mode in which an operation clock having a lower frequency is supplied, the data cache is controlled to supply a data word to an MEM (memory access) stage of the instruction execution circuit within one cycle with respect to an input address associated with the first instruction. In order to execute the second instruction, the data word is bypassed from the MEM stage to the EX stage.
摘要:
In a control signal detection method, a calibration error value is obtained by obtaining the mean value of the received continuous (4.times.n) data, and the calibration error is compensated with respect to the received data by subtracting the obtained calibration error value from the received data, and the correlation value is obtained on the basis of the corrected received data, so that the control signal is detected. Therefore, it is able to compensate the calibration error with ease and to detect the control signal efficiently, with a simple construction.
摘要:
In a multichannel magnetic head including a plurality of head chips secured at fixed intervals to one head base mounted on a rotating drum. Each head chip is arranged so that a center of the curvature of each head tip is positioned substantially on a straight line or an extension of the straight line connecting each head gap to tis rear gap, and each of the head chips is arranged so that the distance L between a crossing point on said straight line connecting each head gap to its rear gap and the head gap, and the radius D of the rotating drum satisfy the following relationship: ##EQU1##