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Cypress Semiconductor Corporation

R Samuel Lee

Roger Guy Markham

James G Eldredge

Peer-to-peer Direct Memory Access (DMA) permits the efficient transfer of data from one DMA capable Application Specific Integrated Circuit (ASIC) block to another without accessing memory. The peer-to-peer transfer can be done over a standard AMBA AHB bus architecture without side band signals and without violating the AHB specification.

Efficient peer-to-peer DMA

An independent hardware pixel counter counts bits of print data in regions of interest. The independent pixel counter can be an application specific integrated circuit (ASIC), and is separate from a control processor. The independent hardware pixel counter selectively monitors a data bus carrying image data to or from a memory. Once the pixels of the image data have been counted, the count data can be sent to the control processor in order to implement a print strategy. The pixel counter counts the print data at a point when image data is being sent to the memory, since at that point the image data is both uncompressed and in a raster format, and thus can be easily analyzed. Additionally, because the image data is stored in the memory until enough print data has accumulated for printing, the processor is provided with sufficient time to gather and use print information before the counted image data is printed.

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Meridian, ID, United States of America

R Samuel Lee