r description and register below, answer the following questions: (20) ys. Using

Question

r description and register below, answer the following questions: (20) ys. Using the deseripto 63 0 Buffer address Reserved Length Command Error Status 63 56 55 40 39 24 23 . 8 7 0 Status flags 0000b: No activity 0011b: Descriptor Done 1100b: End of Packet 0-3 4-7 Reserved Command flags 0000b: No activity 0011b: Load Descriptor 1100b: Clear Interrupt 0011: Start transmit 1100: Compute checksum 0-3 4-7 8-15 Reserved a. Construct the struct in C that would define the descriptor. Assume the device is little- endian. b. Write the code to fill out the descriptor with the following settings: a 1Kbyte buffer of pinned memory, set the length field, clear the status field, and start transmit along with computing the checksum.

Explanation / Answer

strucyt BufferAddress {

struct Status {

activity:4;

Reserved:4;

}st;

int Error:16;

struct command

{

int Activity:4;

int transmit:4:

int Reserved:8

} com;

int Length:16;

int Reserverd:8;

}

BufferAddress b;

b.Length= 1024;

b.st.activity = 0;

b.st.Reserved= 0;

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