AN2333 Freescale Semiconductor / Motorola, AN2333 Datasheet - Page 15

• Manufacturer Part Number: AN2333
• Description: Maximizing the Performance of Two Fast Ethernet Links on MSC8101 FCCs
• Manufacturer: Freescale Semiconductor / Motorola

Freescale Semiconductor, Inc.
CPM Performance Tool
interrupt, itself due to the basic buffer management. As expected, the interrupt frequency increases when
frame size decreases. This demonstrates the need for care in both the interrupt controller and FCC
interrupt handler design.
The results obtained show the high performance of the MSC8101 CPM. They prove that the MSC8101 is
suitable for most applications requiring high throughput. There are technical ways to increase the
Ethernet throughput. For example, several IP packets can be concatenated into one Ethernet frame, with
additional software mechanisms to control the packet latency. Another way would be to implement CPM
microcode for IP and, even upper layers, encapsulation/desencapsulation in the CPM RISC processor.
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CPM Performance Tool
This section describes how to test PowerQUICC II product-based systems such as the MSC8101and
MPC8260. In four steps, it is possible to know the loads on the CPM RISC processor and the two internal
buses (local and 60x-compatible system bus):
1. Launch the CPM_Perf application, read the first screen, and then acknowledge.
Figure 6. CPM Performance Tool, Opening Screen
2. On the main screen, set CPM speed, bus speed, and the access scheme. Then, specify the location of
the buffer and BDs on the local bus (SRAM) or not (SDRAM, DPRAM).
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