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?
Since 60 frames are refreshed per second.
Each frame consists of 640 x 480 pixels,
- The access rate of such a system = (640 x 480) * 60 = 1.8432 x 107 pixels/second.
For the 1280 x 1024 system,
- The access rate is (1280 x 1024) * 60 = 86432 x 107 pixels/second.
b. What is the access time per pixel in each system?
The access time per pixel = 1/ access rate.
The access time is around 54 nanoseconds/pixel for the 640 x 480 system,
The access time is around 12.7 nanoseconds/pixel for the 1280×1024 system.