Dear Vivek,
Many thanks for your help.
Looks like, to create a simple and complete system, Spartan 3 (oldest version, not 3A, 3E etc.) was too good. But Digilent seems to close this series. :-(
Also, the book, "FPGA prototyping by verilog examples", by Pong P Chu uses this version.
Came to knew from Others that, the 1MB SRAM that comes with this board provides a very simple way of interfacing to memory.
Is there any chance, such a simpler design shall be available from any other sources in future?
Any boards available with similar SRAM?
Sincerely,
Srinivas Nayak