IPOTTcommunication is the silicon IP verificationproject the NESTOs: i2c and SPI. There is a 400KHz 2pin I2C interface and a20MHz 4pin SPI interface.
The I2C is protected by a software lock protocol and communicates to the REGISTERMAP array.
The SPI is also protected by a software lock protocol. There is an extra pin UNLOCK that can bypass the protocol. Set UNLOCK=1 to bypass. The SPI communicates to the SPIMAP array.