Daniel W. Dobberpuhl (the founder of PA Semi) was also the architect for StrongARM (when he was at Digital). Intel only got involved because DEC sued Intel for

Daniel W. Dobberpuhl (the founder of PA Semi) was also the architect for StrongARM (when he was at Digital). Intel only got involved because DEC sued Intel for patent infringement (over the Pentium processor), and lost. Intel grabbed a lot of DEC's technology in the settlement, including StrongARM (which became XScale).