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"I have a design with an SPI interface using a 4 MHz SCLK. Theoretically, it should take 4 us to transmit a 16 bit word, but using the USB-8451 module in SPI mode, it sends one word about every 20 us. Is there any way to reduce the 16 us overhead? It appears to be due to the parameter t3 shown on page 7-2 of the user guide, but this applies to the Basic API - is there some means to reduce t3 using the Advanced API or by some other means?"