[ixp1200] communication between SA and ME

Hi, Does anyone know how the Microengine pass the exceptional packets to the StrongARM? If we use Resource Manager in MicroACE, there is a ring buffer between them and the Microengine puts data into it. How does the Resource manager know there is a packet in the buffer? by polling or interrupt? Thanks. -- Li Zhao Dept. of Computer Science Univ. of California, Riverside Tel:1-909-787-2001