How is the PREADY signal triggered low by the Slave in an APB?

Hi, I was trying to understand the state machine of an APB. I was curious on how the PREADY signal is triggered low so that it can exit from the ACCESS state? If anyone could help me with this...
AMBA APB

1)what is the maximum operating frequency of APB?
AMBA APB

1)what is the difference between with wait state and with no wait state(read/write)?what are the advantages of both in APB?
AMBA APB

1) the APB uses massive memory-I/O accesses.what is that massive memory-I/O accesses?
Working frequency on AMBA- APB,AHB, AXI

Hii, Greetings !! I would like to know the standard operating clock frequency and data rate of AMBA- apb, ahb, axi. Please someone help me out. Thanks in advance Regards Ujjwal