The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 28, 1995
Filed:
Dec. 08, 1993
Keiko Kawasaki, Tokyo, JP;
Kazuo Sumitani, Kawasaki, JP;
Yoso Igi, Kawasaki, JP;
Fumiaki Tahira, Sagamihara, JP;
Kenji Fujisono, Yokohama, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
A communication control device includes a transmission speed converting unit having a dual port video RAM containing a RAM and a SAM, and a control unit having a register for storing a data store leading address of the RAM, a register for setting the number of words stored in the SAM, and a CPU. When data are transmitted, a user issues a data transmission request to the CPU in the control unit. According to the request, the CPU reads data from one system at its data transmission speed to the RAM or the SAM of the dual port video RAM, internally transmits the data between the RAM and the SAM, and finally transmits the internally transmitted data to the other system at its data transmission speed. The dual port video RAM absorbs the difference between the data transmission speeds of these two systems, and permits the data transmission at a lower cost than when using a FIFO memory and at a higher speed than when using a buffer memory.