Freescale Semiconductor,inc.

Nxp Usa, Inc.

John D Mitchell

Joseph Charles Circello

John J Vaglica

Peter Jeremy Wilson

Daniel M McCarthy

Osvaldo Israel Romero Cortez

Viktor Fellinger

Sheilah C Phan

A conditional direct memory access (DMA) channel activation system for executing a complex data transfer in a system-on-chip, comprising: a look-up table constructed and arranged to store elements of an activation profile; and a trigger circuit that controls a DMA transaction according to the activation profile of the look-up table.

Conditional direct memory access channel activation

A storage location of a device that can be configured to act as a master in a particular security mode, such as a Direct Memory Access (DMA) having one or more channels, can be programmed to indicate a security indicator to be provided when configured to operate as a master device.

Programmable direct memory access channels

In a data processing system having a processor, a DMA controller, a peripheral, and a memory, a method includes initiating a DMA transfer between the peripheral and the memory, wherein the DMA transfer comprises N subsets of data to be transferred between the peripheral and the memory, N having a value of two or more; asserting, by the peripheral, an event status indicator each time an event is completed by the peripheral; in response to each assertion of the event status indicator, the peripheral, based on a data request enable signal from the DMA controller, performing one of asserting a data request signal provided to the DMA controller or providing an interrupt request to the processor; and in response to each assertion of the data request signal, the DMA controller initiating transfer of a next subset of data of the N subsets of data between the memory and the peripheral.

Data processing system having peripheral-paced DMA transfer and method therefor

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Round Rock, TX, United States of America

John D Mitchell