Please Answer This...
Say i have a uC and i want to interface an external memory... if the uC has a port or GPIF or GPIOs through which i can interface directly to the external memory then it is a glueless interface... Say i've to use a CPLD or programmable logic circuit of some kind between the uC and external memory then it is not a glueless interface...
Practically for design people look for glueless interface because it reduces the IC count, PCB size etc etc