Interrupt Generation: The network card generates an interrupt to notify the CPU that it has data to transfer. The CPU acknowledges the interrupt and starts the process of transferring the data.

Register Modifications: The CPU changes the values of certain control registers to allow the network card to transfer the data directly to DRAM.

Mode Shift: The CPU switches from the normal mode to the interrupt handling mode to handle the data transfer process.

DMA Transfer: The network card initiates the DMA transfer, where the data is transferred directly from the network card to the DRAM without the involvement of the CPU.

Interrupt Handling: The CPU handles the interrupt and takes the necessary steps to complete the data transfer process.

User Program Invocation: The user program, which requires the data, is invoked by the operating system.

Data Access: The user program accesses the data stored in the DRAM.

Mode Shift: The CPU switches back to the normal mode once the data transfer process is complete.