參數(shù)資料
型號： MC68MH360ZQ33L
廠商： Freescale Semiconductor
文件頁數(shù)： 37/158頁
文件大?。?/td> 0K
描述： IC MPU QUICC 33MHZ 357-PBGA
標準包裝： 44
系列： M683xx
處理器類型： M683xx 32-位
速度： 33MHz
電壓： 5V
安裝類型： 表面貼裝
封裝/外殼： 357-BBGA
供應商設備封裝： 357-PBGA（25x25）
包裝： 托盤
Appendix B. Frequently-Asked Questions
Appendix B
Frequently-Asked Questions
B0
This appendix provides a list of frequently-asked questions and solutions for the MH360
and 860MH.
B.1 Questions Common to MH360 and 860MH
Q: What are the performance differences between the 68MH360 and 860MH?
A: Since the 860 and 360 have the same CPM, performance scales linearly with
frequency as shown in Table B-1.
Q: Comparing the MH360 and 860MH, what is the best way to support two T1 TDM
channels?
A: There are two bottlenecks in running the QMC protocol on the 360 and 860. One is
CPM performance, and the other is parameter RAM space.
Running the QMC protocol consumes nearly all of the CPM bandwidth at 25 MHz.
As the CPM is the same for the 360 and 860, the same limitation applies to both
when running at 25 MHz.
In addition, the QMC protocol consumes nearly all of the dual-ported RAM of a 360
preventing more than one QMC from running at the same time (even if the 360’s
speed could be increased).
However, since the 860 has twice as much dual-ported RAM as the 360, it does have
enough space to run two QMCs. Also, the CPM bandwidth is doubled at 50 MHz.
Table B-1. CPU Performance
Device
Frequency
Performance
MH360
25 MHz
6.3 Dhrystone MIPS
33 MHz
8.4 Dhrystone MIPS
PowerQUICC
25 MHz
33 Dhrystone MIPS
40 MHz
52 Dhrystone MIPS
50 MHz
66 Dhrystone MIPS
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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