Browse Prior Art Database

Data Bus Direct Access for Image Data

IP.com Disclosure Number: IPCOM000121917D
Original Publication Date: 1991-Oct-01
Included in the Prior Art Database: 2005-Apr-04
Document File: 1 page(s) / 29K

Publishing Venue

IBM

Related People

Yamamoto, H: AUTHOR

Abstract

Disclosed is a new image data process method for a Parallel Interface Printer to get high performance by skipping the Receive Buffer.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 100% of the total text.

Data Bus Direct Access for Image Data

      Disclosed is a new image data process method for a
Parallel Interface Printer to get high performance by skipping the
Receive Buffer.

      This structure will be best understood with reference to the
figure.  The focal point is that as the image command is recognized
by the Command Decoder, the Image Generator processes the image data
from Data-Bus to Print-Buffer.

      The sequence of DATA BUS DIRECT ACCESS is as follows:
-    The Command Decoder recognizes the image command by parsing the
Receive Buffer.
-    The Image Generator masks the Data Interrupt.
-    The Image Generator recognizes the Strobe Pulse by reading the
Interrupt Request I/O Port.
-    The Image Generator reads the Host Data on the Data-Bus and
writes it to the Print Buffer directly.

      This new method has the advantage to write the Host Data on the
Data Bus to the Print Buffer directly by skipping the Receive Buffer.
By this method, the Image Data process time can be reduced sharply.