Abstract: At present,the communications speed on PCI is limited by PCI bus,the number of the computer’s memory slots is increasing,and the management of memory becomes advanced.So,in this paper,the direct memory communication method,abbreviated as DMC,was put forward.The NIC(the network interface card) based on DMC is inserted into a memory slot,and the memory on DMC-NIC is reserved as communication precinct.When user sends data,he uses the method of writing memory to place the data into communication space,and when user receives data,he uses the method of reading memory to get the data from communication space.So,the user can accomplished the direct point-to-point communications between the computers through accessing memory.The communications speed is not limited by I/O bus,and the copy between memory and NIC is omitted.We also applied DMC into the high-speed fibre channel switch network,and designed the FIFO-DMC NIC to prove that DMC is right.

Key words: Communication I/O,Direct memory communication,Communication precinct,Memory reserved,FIFO