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发表于 2008-11-5 10:14:14
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ARM7 不是没有MMU吗?
参考答案:
第1题,答中一个得5分,答出其它正确答案的,也得5分。
a)都基于TCP/IP协议,都提供了面向连接的TCP SOCK和无连接的UDP SOCK。
b)都是一个sock结构体。
c)都是使用sock文件句柄进行访问。
d)都具有缓冲机制。
小弟一时也没有答上来,不过一直知道a,b,c。d没有仔细研究过。
以前一直有个误区,ARM7都没有MMU,今天特地找了一下。有的是有的,有的是没有。
http://www.arm.com/products/CPUs/families/ARM7Family.html
The ARM7 family is a range of low-power 32-bit RISC microprocessor cores optimized for cost and power-sensitive consumer applications. Offering up to 130MIPs (Dhrystone2.1), the ARM7 family incorporates the Thumb 16-bit instruction set - enabling 32-bit performance at 8/16-bit system cost. The family consists of the ARM7TDMI, ARM7TDMI-S and ARM7EJ-S processor cores and the ARM720T cached processor macrocell, each of which has been developed to address different market requirements:
* Integer processor
* Synthesizable version of the ARM7TDMI processor
* Synthesizable core with DSP and Jazelle TM technology enhancements for Java acceleration
* Cached core with Memory Management Unit (MMU) supporting operating systems including Windows CE, Palm OS, Symbian OS and Linux
受教了。谢谢。 |
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