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388 Hardware Reference Manual
Intel
®
IXP2800 Network Processor
Performance Monitor Unit
11.4.5 Threshold Events
These are the outputs of the threshold comparators. When the value in a data register is compared
to its corresponding counter value and the condition is true, a threshold event is generated.
This results in:
• A pulse on the signal lines that are routed to the event’s input port (one signal line from each
comparator).
• One piece of functionality this enables is to allow for CHAP commands to be completed only
when a Threshold Event occurs. In other words, a Threshold Event can be used as a Command
Trigger to control the execution of any CHAP command (start, stop, sample, etc.). See
Table 154.
Table 154. Chap Counter Threshold Events (Design Block # 0001)
Multiplexer # Event Name
Clock
Domain
Single
pulse/
Long
pulse
Burst
Description
000 Counter 0 Threshold P_CLK single separate
Threshold Condition True on
Event Counter 0
001 Counter 1 Threshold P_CLK single separate
Threshold Condition True on
Event Counter 1
010 Counter 2 Threshold P_CLK single separate
Threshold Condition True on
Event Counter 2
011 Counter 3 Threshold P_CLK single separate
Threshold Condition True on
Event Counter 3
100 Counter 4 Threshold P_CLK single separate
Threshold Condition True on
Event Counter 4
101 Counter 5 Threshold P_CLK single separate
Threshold Condition True on
Event Counter 5