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1. XPS_I2C_SLAVE: forwards commands coming from the USB bus towards the MicroBlaze;
2. XPS_NPI_DMA: custom DMA between DDR SDRAM and other multiple sources;
3. XPS_FX2: used for high speed bidirectional communication between the FPGA and a host PC.

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title Reference architecture block diagram.
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XPS_I2C_SLAVE

It is a logic block for low speed bidirectional communication between the FPGA and a host PC. It is usually used for command, settings and status communication. It contains 6 × 32-bit memory mapped registers:

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