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Here it can be seen that during one clock cycle, the CPU can fetch instructions from Flash memory while at the same time the CPU can be writing data to a USB or serial channel to send data to another device. At the same time, the Ethernet DMA controller is moving data packets out on the Ethernet bus from SRAM while the EXDMA is moving data on the external data bus from one external device to another. This could be a graphic frame buffer DRAM and a color TFT-LCD panel. Notice that all four of these transfers are happening simultaneously, each one on separate physical busses with no interference with each other. However, it is still possible to move even more data while this is occurring.
PTM Published on: 2012-05-15
