Accessory control device which transfers data from electronic de

Details Accessory control device which transfers data from electronic de Accessory control device which transfers data from electronic de

1992-07-08

1996-09-03

Bayerl, Raymond J.

395114, G06F 1500

Patent

active

055532020

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.

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