Detect Protocol on bus

[LittleRain]

Just got my first CPLD, the Altera Max II.
I was wondering if it would be possible to detect a protocol on a bus, not necessarily for the max II, just in general.

What I want to do, is add a micro USB port to my board, and use custom cables that plug into different devices with different protocols.

One device would be a regular PC, and use regular USB.
Then another device uses SPI, another using 1 wire, and possibly some other protocols, not at the same time of course.

What I want the CPLD to do, is to detect what protocol it is, and then forward the signal to the correct pins on a micro controller.
The device is hand held, and doesn't have the room to have separate ports for each protocol.

Is this possible, and how would I go about getting started on something like this?

Thanks

[rjp]

sounds like a digital logic analyzer ?

if you dont want to take on the hardware and the software, learning how to drive https://sigrok.org/  would probably be a start, you get lots of protocol decoders for free.
--

misread requirement, sorry.

[LittleRain]

Not quite, I already have a logic analyzer actually.
Sorry I should have been a little more specific, once it finds out which protocol, I need my device to start talking to the PC/device on said protocol.
I basically want to squish a few devices I have made, and am currently working on, into 1 device.

[senso]

Use a pin, or a couple to give an ID to each cable, now it just knows the protocol based on the cable that is plugged in.

Or just use a couple positions/connectors, and each position is one protocol.

[LittleRain]

I was thinking about doing that, but I'd have to use USB C to get enough pins for each ID, and unfortunately I'd have to do the same for the position based approach.
But if it is cost effective compared to a CPLD I may as well go that route. Big problem is, if the consumer uses a regular USB C cable, power could be sent to another buses pins.
I'll look into it further though, thanks.

[TomS_]

I was thinking about doing that, but I'd have to use USB C to get enough pins for each ID

What about a multi-way IDC header/connector?

Or perhaps a smaller connector, even USB type A, but hook various resistor values up to one pin and use an ADC or some opamps to detect various voltages created by a resistor divider, with each voltage corresponding to a different protocol?

[jhpadjustable]

I2C EEPROMs are available in SOT23-5 packages.