A method and system for eliminating null I/O operations that transfer null data during processing of FORMAT and INITIAL-COPY I/O device commands and READ and WRITE I/O requests by an I/O device. Indications of whether or not a particular logical unit is sparsely populated with data are stored in the I/O device, along with bit maps indicating null tracks for sparse logical units. By referencing the stored indications and bit maps, the I/O device controller can recognize null operations that may be safely eliminated, saving processing and data transfer resources and eliminating time delays.

Method and system for efficient format, read, write, and initial copy processing involving sparse logical units

A print control device allows image data to be generated from intermediate data and printed by a printing unit. The print control device comprises generating means for generating image data from intermediate data memorized in an intermediate buffer, a band raster buffer for memorizing said image data generated by said generating means, a cache buffer for allowing cache of said image data generated by said generating means, and control means for reserving said intermediate buffer for memorizing said intermediate data by extending said band raster buffer to a full-raster buffer of one page or deleting said cache buffer, when the capacity of said intermediate buffer is insufficient.

Apparatus and method for print control

A system includes a generator component that determines a plurality of portions that comprise an entirety of error-indicating acknowledgement information. The system includes a generator component that cycles through the plurality of portions that comprise the entirety of the error-indicating acknowledgement information to send the error-indicating acknowledgement information.

Cycling through entirety of error-indicating acknowledgment information

A print-direct printer for receiving and printing JPEG data from a DSC divides the area of a memory into a plurality of blocks, stores the received JPEG data in the memory on a block-by-block basis and decompresses the compressed JPEG data that has been stored in the memory, thereby expanding the JPEG data into image data. If it is determined that JPEG data to be expanded next has not been stored in the memory, then the DSC is requested for JPEG data corresponding to at least one block, in an amount that is less than the maximum amount of data transferable from the DSC, in addition to the JPEG data to be expanded.

Image printing apparatus and image printing control method

An output interface allows a user circuit to access data for multiple objects in an interleaved fashion. Status information is provided to guarantee data availability before each transfer sequence is started. An identifier is provided for each object. Each identifier, after data transfer has ended, may be subsequently reused to identify a different object. The interface provides the ability to retrieve all data in an object or to cancel the object before reaching the end and discarding the unretrieved data. The objects are provided to the appropriate processing mechanisms within the printer to implement a printing task. These objects correspond to images and text to be printed on a page. Object data is temporarily stored in limited data memory of the memory system and object headers are stored in header memory before transfer via the output interface. Each object to be printed has an object header and may, or may not, have associated object data.

Output interface for a raster object memory in a method, system and program

An improved printer is provided that receives a print job from a host computer and divides the bitmap image of a page to be printed into a series of image blocks or tiles. Each image block containing non-null data will be stored in the printer's memory system, typically placed in a non-contiguous memory location with respect to other blocks. The null image data blocks will not be stored in the printer's memory system, but instead only their locations on the physical printed page will be stored in a "block list table." Each entry in the block list table contains the beginning address of the physical RAM area that contains one of the image data blocks, and also contains other variables or attributes concerning the particular image data block, such as whether or not this block is a regular non-null data block, or a "no-op" (or "NOP") block containing null data. Null data blocks require no physical memory address to be listed in their entry on the block list table, since no physical RAM areas are needed for storing null bitmap image data. Rather than building a band buffer in contiguous memory before shipping rasterized data to the laser printhead, the present invention builds in a cache a series of rasterized line segments of bitmap data in real time and sends them to the laser printhead "on the fly," by retrieving a single rasterized line segment of data, block-by-block, as needed to complete a single entire line.

Method and apparatus for building rasterized lines of bitmap data to be printed using a piecewise-linear direct memory access addressing mode of retrieving bitmap data line segments

An improved printer (10) is provided that receives
a print job from a host computer and divides the bitmap
image of a page to be printed into a series of image
blocks or tiles. Each image block containing non-null
data will be stored in the printer's memory system. The
null image data blocks will not be stored in the
printer's memory system, but instead only their
locations on the physical printed page will be stored in
a "block list table." Each entry in the block list
table contains the beginning address of the physical RAM
area that contains one of the image data blocks, and
also contains other variables or attributes concerning
the particular image data block, such as whether or not
this block is a regular non-null data block, or a "no-op"
(or "NOP") block containing null data. Null data
blocks require no physical memory address to be listed
in their entry on the block list table, since no
physical RAM areas are needed for storing null bitmap
image data. The invention builds in a cache a series of
rasterized line segments of bitmap data in real time and
sends them to the laser printhead "on the fly," by
retrieving a single rasterized line segment of data,
block-by-block, as needed to complete a single entire
line required to define a "scan line" to be created on a
photoconductive drum. While a particular block list
entry resides in the cache, the block address is
inspected to direct a read operation from the
corresponding area of RAM that is holding the bitmap
"real data" for this particular block. By use of
pointers, the appropriate rasterized line segment of 
bitmap data will be retrieved from the corresponding
memory locations in RAM, and transferred into a first
in, first out (FIFO) memory in the ASIC. As the laser
printhead requires data for this particular line
segment, the FIFO memory will provide serialized data at
the appropriate data transmission rate. If the
particular block of data is a null block, then when its
corresponding block list entry is inspected while
residing in the cache, its "NOP" attribute will indicate
that the printer's image system should not look to the
RAM to find the "real data" for this particular block's
rasterized line segment, but instead should pull a line
segment of null data from a special NOP register
residing within the ASIC. This NOP register will feed a
line segment of either all zeros or ones (depending upon
whether regular image data or reverse image data is
desired for the printed page) to the FIFO memory in the
ASIC. This null data then will be sent to the laser
printhead at the appropriate data transmission rate from
the bottom of the FIFO memory.

Method and apparatus for building bitmap data in a printer

Method and apparatus for prints

Printing apparatus and method

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Method and apparatus for building rasterized lines of bitmap data to be printed using a piecewise-linear direct memory access addressing mode of retrieving bitmap data line segments

Method and apparatus for building bitmap data in a printer

Method and apparatus for prints

Printing apparatus and method