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:
Sep. 03, 1996
Filed:
Jul. 08, 1992
Seiko Epson Corporation, Tokyo, JP;
Abstract
An accessory control device, also called a cartridge, is coupled to an electronic device, such as a printer, and a large amount of data is transferred from the electronic device to the accessory control device. An electronic control device within the electronic device reflects the data it is transferring to cartridge 3 installed in a slot of a printer in the lower 8 bits of the address signal line (CAB) and outputs the data. Data corresponding to this address are read from ROM 671 according to this address specification and held in latch 657. The cartridge is internally equipped with a FIFO memory 621, and when register FIFOREQ of the FIFO write registers is accessed, the data being held in latch 657 is written to FIFO memory 621 and the address counter for writing is incremented. The transfer of multiple bytes of data from the electronic device is completed by repeating this process. By means of a configuration that utilizes signal/FIFOWR, which is output by accessing register FIFOWR that specifies the setting of data in latch 657 as the signal/FIFOREQ, data can be transferred in a single access.