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Core-Slide12

Here is Internal Main Bus 2. Three bus masters can arbitrate for bus ownership; they are the Ethernet DMA controller, the general DMA controller, and the Data Transfer Controller. Each of these controllers offloads the CPU while moving data from peripheral to peripheral, peripheral to memory, and memory to memory. The Internal Main Bus 2 can also access the external bus pins through the BSC, as well as accessing peripherals through a bus bridge. RX has a very unique feature in the External DMA controller, or EXDMA. This DMA controller can take possession of the BSC and the external CPU bus pins to orchestrate the movement of data from one external device to another external device, with the data never entering the RX MCU. This is very efficient in that loading on the CPU is minimal even when high bandwidth data transfers are being conducted outside the chip. For example, EXDMA easily supports moving RGB image data from an external frame buffer in RAM to an external TFT-LCD panel, as in the Direct Drive solution.

PTM Published on: 2012-05-15