# Consider two raster systems with the resolutions of 640 x 480 and 1280 x 1024.

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### Consider two raster systems with the resolutions of 640 x 480 and 1280 x 1024.

a) How many pixels could be accessed per second in each of these systems by a display controller that refreshes the screen at a rate of 60 frames per second?

Solution:

Since 60 frames are refreshed per second and each frame consists of 640 x 480 pixels,

the access rate of such a system is (640 x 480) * 60 = 1.8432 x 107 pixels/second.

Likewise,

for the 1280 x 1024 system, the access rate is (1280 x 1024) * 60 = 7.86432 x

107 pixels/second.

b)  What is the access time per pixel in each system?

Solution:

According to the definition of access rate, we know that the access time per pixel should be 1/(access rate).

Therefore, the access time is around 54 nanoseconds/pixel for the 640 x 480 system,

and the access time is around 12.7 nanoseconds/pixel for the 1280×1024 system.

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