Patent ID: 6571303
Filing Date: 2003-05-27
Classification: G06F,H04L

Abstract:
A communication control system comprising:a system processor which processes communication data according to a higher level communication protocol; a system memory which stores programs executed by said system processor and a data processed by said system processor; a communication controller, coupled to a transmission line and to said system memory, which transmits and receives a frame including said communication data on said transmission line while controlling said transmission line and processing said frame according to a lower level communication protocol; a data buffer which stores said communication data, said data buffer being shared by said system processor and said communication controller; a first buffer descriptor for managing said data buffer, said first buffer descriptor including a virtual address of said data buffer and being used by said system processor; and a second buffer descriptor for managing said data buffer, said second buffer descriptor including a real address of said data buffer and being used by said communication controller, wherein said system processor converts said virtual address in said first buffer descriptor into said real address and stores said real address into said second buffer descriptor.