i need connect (16bit ram) and (16bit harddisk ide) to AVR or 8051
but avr or 8051 is 8bit
for the RAM, just connect D8-D15 to greoun and you have a nice 8 bit RAM.

For the IDE:
In a CPLD latch 8 bits for write, on !WR gate them to D8-D15 of the IDE. For read latch D8-D15 from the IDE in the CPLD on !RD and read them after D0-D7 which were read 'normal'

A dramatic suggestion : use a 16 bit processor instead.

Erik