The board EL501 is a rear transmission module (RTM) used as a carrier for the following custom mezzanines:
It is possible to plug up to 4 different mezzanines boards on it, in order to offer a maximum of I/Os for the user application. This board is the link between Mezzanine and FPGA through VME P2 connector. The combination - FPGA board (the SVEC board has been used currently) + EL501 + mezzanines - offers a lot of possibilities.
By choosing a combination of mezzanines, it is possible to have up to 64 programmable I/Os with multiple standards (NIM - TTL - OC ...).