Hi I am working in project that need 64 kbyte sram. Can I connect Lpc1343 to external Ram?
Well it doesn't claim to have an external bus, now does it? www.nxp.com/.../LPC1311_13_42_43.pdf
You might be able to interface one using all the available IO, but I'm not sure that's practical, and your project probably has other requirements for those.
Perhaps you can find a CPU better suited to your needs, external memory tends to be bandwidth limiting.
Reading technical documentation is a very important engineering skill.