Consider a microprocessor that has a memory read timing as shown in Figure 3.19. After some analysis, a designer determines that the memory falls short of providing read data on time by about 180 ns.
a. How many wait states (clock cycles) need to be inserted for proper system operation if the bus clocking rate is 8 MHz?
b. To enforce the wait states, a Ready status line is employed. Once the processor has issued a Read command, it must wait until the Ready line is asserted before attempting to read data. At what time interval must we keep the Ready line low in order to force the processor to insert the required number of wait states?
Figure 3.19
Timing of Synchronous Bus Operations

Transcribed Image Text:

Clock Status lines Status signals Address lines Stable address Address enable Data lines Valid data in Read cycle Read Data Write l lines Valid data out cycle Write