Reference no: EM131658187
1- You have a PC with a 2 GHz processor, a system bus clocked at 400 MHz, and a 3 Mbps internal cable modern attached to the system bus. No parity or other error-checking mechanisms are used.
The modern has a 64-byte buffer. After it receives 64 64 bytes, it stops accepting data from the network and sends a data ready interrupt to the CPU. When this interrupt is received, the CPU and OS perform the following actions:
a. The supervisor is called.
b. The supervisor calls the modern's data ready interrupt handler.
c. The interrupt handler sends a command to modern, instructing it to copy its buffer content to main memory.
d. The modern interrupt handler immediately returns control to the supervisor' without waiting for the copy operation to be completed.
e. The supervisor returns control to the process that was originally interrupted.
When the modern finishes the data transfer, it sends a transfer completed interrupt to the CPU and resumes accepting data from the network. In response to the interrupt, the CPU and OS perform the following actions:
a. The supervisor is called.
b. The supervisor calls the transfer completed interrupt handler.
c. The interrupt handler determines whether a complete packet is present in memory. If so, it copies the packet to a memory region of the corresponding application program.
d. The modern interrupt handler returns control to the supervisor.
e. The supervisor returns control to the process that was originally interrupted.
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