(b) Direct memory access (DMA)

(b) Assume there is no forwarding in this pipelined processor. Indicate hazards and add NOP instructions to eliminate them.

(a) Consider a direct-mapped cache with 16KB of data and 16-byte blocks, assuming a 32-bit 300ps address. What is the length of the tag field? How many total bits are required, assuming a valid bit is used?

(b) Assume an instruction cache miss rate for gcc of 2% and a data cache miss rate of 4%. If a machine has a CPI of 2 without any memory stalls and the miss penalty is 40 cycles for all misses, determine how much faster a machine would run with a perfect cache that never missed. Assume 36% of instructions are loads/stores.

(a) Page fault

1. Use Laplace Transform to solve the differential equation y"+4y'+3y=e'；y(0)=0,y'(0)=2.

2.The points A(1,-21), B(0,1,6) and C(-3,4,-2) form the vertices of a triangle. Calculate the angle between the line AB and the line from A to the midpoint P of . You do not need to give the explicit value of the angle. Just express the angle using inverse trigonometric functions. Hint: use dot product for two vectors AB and AP which is a scalar equal to the multiplication of the lengths of the two vectors and the cosine of the angle between the two vectors.

3. Find the plane containing the points A(1,21), B(-1,13) and C(-2,-2,-2). Hint: the cross product of two vectors is another vector that is orthogonal to the two vectors. 

4.1 Find the eigenvalues and the corresponding eigenvectors of the matrix A.

4.2. Find matrix P that makes matrix A diagonal, that is, D= lAP where D is a diagonal matrix.

4.3 Find the n-th power of matrix A, that is, A". It is not necessary to explicitly compute . You can just express the result in terms of P and .