Matsushita Electric Industrial Co., Ltd.

Yoshito Nishimichi

Hiroaki Yamamoto

Shinji Ozaki

Masaru Uya

Akira Miyoshi

Katsuyuki Kaneko

Nobuo Higaki

Masato Suzuki

Shinya Miyaji

Nobuki Tominaga

Yoshiaki Kasuga

Seiji Tokunoh

Satoshi Ogura

Adder circuit and associated layout structure

Two flip-flops and decode circuits are provided. Whereas the one flip-flop receives 1-bit bit-shift-amount data B(1), the other flip-flop receives 1-bit bit-shift-amount data B(0). The decode circuits decode the bit-shift-amount data from the flip-flops. The flip-flops and the decode circuits are laterally laid out in a line. The flip-flops and the decode circuits are symmetrically laid out in bits, together with four flip-flops that receive respective 1-bit data to be bit-shifted (data A(3) to A(0)) and a bit shifter that bit-shifts the data A(3) to A(0) for a bit shift amount from said decode circuits, to form a bit slice structure and to be arranged within a data path. Accordingly, it is possible to achieve an effective reduction of the length of signal wiring over which bit-shift-amount data propagate. The reduction of wire load can be accomplished. The speed-up of data bit shift processing can be realized.

Layout structure for barrel shifter with decode circuit

The present data processing apparatus effects the pipeline operation for each of the machine cycle time with a plurality of pipeline stages processed in parallel. With respect to a load & extension instruction for instructing with the single instruction a first processing portion for reading the data shorter than the register length from RAM 19 and a second processing portion for zero-extending or the sign-extending the data into the register length, a zero-extension or a sign-extension operation in the second processing operation is executed, in a pipeline stream different from the pipeline stream where a first processing operation is executed or in a pipeline stage different from the pipeline stage where the reading from the storage portion of the first processing operation is executed.

Data processing apparatus for performing a pipeline operation on a load

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.

Semiconductor integrated circuit and system incorporating the same

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.

System for controlling operating timing of a cache memory

Data processor

A phase locked loop (PLL) is disclosed, which produces a source clock signal which has a frequency twice that of a reference clock signal fed from the outside and is in synchronism with a reference clock signal. A timer counts pulses of a reference clock signal in order to measure time corresponding to the lock-in time of the PLL and delivers a count completion signal when the value of counting reaches a predetermined value. A start controller is in control of a clock buffer so that, after a count completion signal is delivered, the clock buffer starts feeding a source clock signal to a load circuit as an internal clock signal, in synchronism with a reference clock signal. A stop controller is also in control of the clock buffer so that, when a clock stop request signal becomes asserted, the clock buffer stops feeding an internal clock signal, in synchronism with a reference clock signal.

Phase locked loop clock generator

A timing control circuit to be used for a phase locked loop (PLL) wherein, a plurality of delay circuit elements capable of controlling the delay connected in series are used as a signal delay circuit, delay values of all the delay circuit elements can be changed at the same time with the delay control signals of the respective delay circuit elements being commonly connected, and the delay control signal is controlled so as to select the desired delay with the combination of a selecting circuit, a bi-directional shift register circuit, a phase detecting circuit, a shift control circuit, a delay control circuit so as to realize the wide range of timing control, thereby to provide a function of adjusting the delay of a signal delay circuit for effecting a timing control operation.

Timing control circuit

A FIFO memory using one of the ports of a RAM having two or more ports for writing and another port for reading is disclosed. Writing into the FIFO memory is done instantly, while reading from the FIFO memory is effected by holding the output of the preliminarily accessed RAM until the end of a reading operation. The output of the RAM is updated by a request from outside and according to the state of the FIFO memory, and this operation is done simultaneously with reading or writing.

First-in-first-out memory capable of simultaneous readings and writing

An integrated circuit having a latch circuit with a selection function includes a selection circuit having a plurality of logic circuits each capable of presenting three output states depending on a selection signal supplied thereto, a latch circuit having a bistable circuit composed of first and second logic inverting circuits, and a connection system for supplying an output of the selection circuit to an input of the latch circuit. An output resistance of the second logic inverting circuit is set to be at least ten times as high as an output resistance of any one of the logic circuits which make up the selection circuit.

Growing community of inventors

Osaka, Japan

Yoshito Nishimichi