AN2333 Freescale Semiconductor / Motorola, AN2333 Datasheet - Page 17

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

4. Directly watch the results or save them into a text file.
The assumptions underlying the 2FCCs project settings are as follows:
• CPM bus access schemes:
• CPM FCC configuration:
Table 7 shows the results of simulations for two scenarios.
— System bus memory wait states = 5, 1, 1, 1
— Local bus memory wait states = 5, 1, 1, 1
— Data is placed on the local bus (internal SRAM)
— Buffer descriptors are placed on the local bus (internal SRAM)
— Receiver baud rate = 100 Mbps (Fast Ethernet)
— Transmitter baud rate = 100 Mbps (Fast Ethernet)
— Buffer length = 1500 bytes (no frame fragmentation)
— Unaligned buffers = YES (optimum)
Frame Size (Bytes)
Configuration
Freescale Semiconductor, Inc.
Speed
138
218
64
98
For More Information On This Product,
Figure 9. CPM Performance Tool, Screen 4
Go to: www.freescale.com
CPM Busy (%)
CPM/Buses Clock = 98/39 MHz
Table 7. CPM Performance Tool Results
150.22
122.26
96.10
71.56
FCC Busy (%)
75.11
61.13
48.05
35.78
CPM Busy (%)
CPM/Buses Clock = 150/100 MHz
98.15
79.87
62.79
46.75
CPM Performance Tool
FCC Busy (%)
49.07
39.94
31.39
23.38
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