I'm trying to reverse engineer the SPI communications between two chips. But, it's not clear who's master and who's slave.
I've found the chip select. Without lifting any pins or cutting traces is there a way to detect which end is asserting it?
The chips are: CC1110 (SoC radio) and CY7C63803 (USB MCU). The chip select comes off of the SSEL (slave select) line on the CY7C63803 and into a GPIO pin on the CC1110.
The CY7C63803 is an SOIC, so I could lift a leg, but I don't want to break it.