Avalon Memory Map bus interfaces (slave, master dma read, master dma write)
AVALON_SLAVE: AVALON MM Slave interface
FIFO: Simple fifo - 8x32
FIFO_INTER: Enable to connect two synchronous fifos in serial.
CDCFIFO8: Clock domain crossing fifo - 8x32
AVALON_WRITE_MASTER: AVALON MM Master Interface (write DMA)
AVALON_READ_MASTER: AVALON MM Master Interface (read DMA)