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Intel
®
IXP42X Product Line of Network Processors and IXC1100 Control Plane Processor
September 2006 DM
Order Number: 252480-006US 377
Internal Bus Performance Monitoring Unit (IBPMU)—Intel
®
IXP42X product line and IXC1100
control plane processors
11.2.2 Monitored SDRAM Events
Selecting SDRAM mode enables the programmable event counters to monitor SDRAM
hits and misses. All programmable event counters are clocked at 133 MHz frequency.
11.2.3 Cycle Count
In all but halt mode, Programmable Event Counter 7 can be configured to count
133-MHz bus-clock cycles. The ability to count the 133-MHz bus-clock cycles is referred
to as “cycle count.”
The cycle count allows an accurate measurement of the duration of the test to be
made. The cycle count is reset and started each time a value is written to the ESR and
the mode is not halt. When HALT mode is selected the counter stops, preserving its last
value. If the count overflows the PEC7, the overflow interrupt is set.
MstrX_Grant
North:
•WAN/Voice NPE
•Ethernet NPE A
•Ethernet NPE B
South:
•Intel XScale
processor
• AHB/AHB Bridge
• PCI Bus
•AHB/APB Bridge
Occur
Monitors the number of times the master is granted the bus. It increments
the counter when the master is the bus initiator.
The counter is incremented once for every new transaction. For multi-cycle
transactions, the counter increments once on the first cycle.
MstrX_Xfer
North:
•WAN/Voice NPE
•Ethernet NPE A
•Ethernet NPE B
South:
•Intel XScale
processor
• AHB/AHB Bridge
• PCI Bus
•AHB/APB Bridge
Occur
Increments the counter every time that the master initiates a transaction
on the bus.
This event primitive can be used in conjunction with another event
primitive, MstrX_Retry, to calculate the effectiveness of transactions
initiated on the AHB Bus by the master (i.e., percentage transactions
initiated by the master that are not retried.).
MstrX_Retry
North:
•WAN/Voice NPE
•Ethernet NPE A
•Ethernet NPE B
South:
•Intel XScale
processor
• AHB/AHB Bridge
• PCI Bus
•AHB/APB Bridge
Occur
Increments the counter every time that a transaction initiated by the
master is responded to with a retry by the target.
SlaveX_Split
North:
• AHB/AHB Bridge
South:
• PCI Bus
• Expansion Bus
Occur Counts the number of times that SlaveX claims a Split Transaction.
Table 142. North and South Modes Event Descriptions (Sheet 2 of 2)
Event
Bus
Components
Type Description