What possible bitrates do the Aardvark I2C/SPI Host Adapter support?

The Aardvark adapter I2C master can operate at a maximum bitrate of 663 kbps and supports many intermediate bitrates between 32 kHz and the maximum. For slave functionality, the Aardvark adapter can operate at any rate less than the maximum bitrate of 595 kbps.

The Aardvark adapter SPI master can operate at bitrates of 125 kHz, 250 Khz, 500 Khz, 1 Mhz, 2 MHz, 4 Mhz, and 8 Mhz. The Aardvark adapter SPI slave can operate at any bitrate up to 4 Mbps.

Please see the datasheet for more details and signaling constraints.