Hitachi, Ltd.

Hitachi Engineering Co., Ltd.

Other

Masahisa Narita

Shigeru Matsuo

Hidehito Takewa

Koyo Katsura

Yasuhiro Nakatsuka

Keisuke Nakashima

Tomoaki Aoki

Mitsuru Watabe

Shigeki Morinaga

Norio Nakagawa

Yugo Kashiwagi

Hiroyuki Kida

Tetsuaki Nakamikawa

Junichi Tatezaki

Hisashi Kaziwara

Takeshi Asai

Shunpei Kawasaki

Shinji Fujiwara

Tadashi Fukushima

Tooru Komagawa

In a device and system which perform processing (displaying and outputting) of image data, the amount of data transferred between a memory holding the image data and a processor processing the image data is limited, thereby a great amount of data can be processed at high speed.

Graphics drawing device and method

Image processing device and system using the same

A compact and small compensating-electric-power data processor is realized by dividing a plurality of calculations to be carried out by a complex instruction into a number of executing units to be processed, instead of executing the calculations in parallel as in the past. For this purpose there is provided a decoder having a detecting part for decoding an instruction and for detecting whether the instruction is an instruction for executing a plurality of calculations, a field rearranging part for rearranging a part of the fields of said instruction based on a predetermined number of calculations to be processed if it is judged by said detecting part that the instruction is an instruction for executing a plurality of calculations, and a calculation control part for performing control to execute the calculations in plural cycles in synchronism with the order of said rearranged fields. A calculation part operates to execute the calculations called for by dividing the instruction into plural cycles based on control from the calculation control part.

Data processor for processing a complex instruction by dividing it into

Graphics drawing device with hidden surface processing

A multiplication, division and square root extraction apparatus which calculates the solutions to addition, division and square root extraction functions by approximation using iteration has a multiplier, an adder-subtracter and a shifter of prescribed bit width connected to a bus. Iteration is conducted by inputting the output of the multiplier to the adder-subtracter or the shifter and returning the result to the input of the multiplier via the bus. A shifter and an arithmetic and logic unit connected to a second bus connected to the aforesaid bus via a switch have a greater bit width than the prescribed bit width and are used for large scale calculations, thus preventing a reduction in processing speed.

Multiplication, division and square root extraction apparatus

In a device and system which perform processing, (displaying and outputting) of image data, the amount of data transferred between a memory holding the image data and a processor processing the image data is limited, thereby a great amount of data can be processed at high speed.

Image data processor for processing pixel data in block buffer

System for obtaining strict solution in accordance with accuracy of

A cursor display control in a graphic display system is provided in which a storage range is provided for exclusive use for a cursor pattern and a desired shape is defined in the storage range to thereby perform a high-speed cursor movement. A display control apparatus in the graphic display system includes a memory for storing a cursor pattern, shift register for performing a shift processing in a non-display period of the cursor for positioning in the display screen, and parallel-serial converter for performing parallel to serial conversion at the display timing of the cursor, whereby the apparatus is suitable to be integrated in the form of an LSI and the cursor can be moved at a high speed on the screen.

Cursor display control method and apparatus in a graphic display system

Growing community of inventors

Hitachi, Japan

Masahisa Narita