Leaderboard

It's not quite clear to me what you want to do? You want to have one J89 SRIO chain and switch between several Cores? If that's right, it is trivial to make a Johnson counter/decade counter out of a 4017 chip. You could think to use the output enable pin(s) of the buffer (541 or 125) that is used to interface the buss to the core. Each Core gets one buffer with the datalines connected to the inputs (+DIN to an output), the outputs are common to the J89 chain (+ the serial in). Advance the counter to "turn on" one chip.