Section 5: Computer Structure Flashcards
What is address propagation delay (t_pA)?
The time for the address to propagate from the bus master to all of the potential slaves.
What is Data Propagation Delay (t_pD)?
The time for the data to propagate from the data source to all of the potential data receivers
What is the bus propagation delay (t_p)?
The maximum of the separate (Data and Address) propagation delays. T_p = max(t_pA, t_pD)
What is the setup time?
The minimum time that a signal has to be available at the input to the buffer before the active clock signal (edge) arrives. (At the slave for a write and at the master for a read).
What is hold time?
The minimum time that data has to be held stable after the clock edge that triggers the transfer. (At the salve during a write an the master during a read).
What is select time (t_s or t_select)?
The time required for a device (or interface) attached to a shared communication media (a bus) to detect that the current transfer involves the device (or interface). This time does not include any of the time required by the device (or interface) to perform any internal address decoding.
What is access time (t_access)?
The time required for the interface to access the information for the bus after the device or interface has been selected and the address is correct.
What is store time (t_store)?
The time required for the interface to enable the correct location and to write the appropriate value into that location after the device (or interface) has been selected and the address is correct.
What is skew time (t_skew)?
Skew time is the difference (largest or worst case) in signal propagation times. It’s the magnitude of the difference between two events that would ideally occur at the same time.
What is margin time?
This is a time where there may be some design flexibility. The margin time is the over design that a designer includes for safety to ensure a successful operation.
