12.8 System Interface Cycle Time
The number of latency cycles is the number of unused cycles between the address cycle of the request and the first data cycle of the response. Intervention response latency and snoop response latency are a function of processor internal activity and secondary cache access time. Table 12-10 summarizes the minimum and maximum intervention response latency and snoop response latency. Note that the latency values are subject to change.
Table 12-10 Intervention Response and Snoop Response Latencies 
External read response latency is a function of processor internal activity. Minimum and maximum external read response latency is 4 PCycles.
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