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rootlinger 发表于 2005-12-21 09:18

4510能否接2片各16M,总共32M的sdram?

各位大侠,有没有人在4510上接32M内存,具体怎么接的,和dramcon怎么配置的,是否简单介绍一下?希望能跟大家交流4510的16M内存外扩为32m内存的问题,多谢!

lumit-support-1 发表于 2005-12-21 23:57

S3C4510B can support below SDRAM configuration for 1 bank.
· 2MBytes to 1 bank   1 x  (2Mx32 with 4banks)
· 4MBytes to 1 bank   2 x  (1Mx16 with 2banks)
· 8MBytes to 1 bank   4 x  (2Mx8 with 2banks)
· 16MBytes to 1bank  2 x  (4Mx16 with 2/4banks)
· 32MBytes to 1bank  4 x  (8Mx8 with 2/4banks)

按照上面的说法,接两片各16M,共32M的SDRAM应该不行吧

用4片8Mx8的sdram,扩展数据宽度为32位
地址线并联就可以了吧

rootlinger 发表于 2005-12-22 10:19

多谢lumit-support-1的热情回答,但在手册上,又有一下一些注释,这些又能说明什么了?请教一下您了!呵。。
You can select any combination among them.
SDRAM components that are available are as follow.
x4 SDRAM whose capacity is larger than 16M SDRAM is not supported at S3C4510B.
16M bit SDRAM
— 4Mx4 with 2banks (Supported) RA0–RA10, CA0–CA9
— 2Mx8 with 2banks (Supported) RA0–RA10, CA0–CA8
— 1Mx16 with 2banks (Supported) RA0–RA10, CA0–CA7
64M bit 2Banks SDRAM
— 16Mx4 with 2banks (not supported) RA0–RA12, CA0–CA9
— 8Mx8 with 2banks (supported) RA0–RA12, CA0–CA8
— 4Mx16 with 2banks (supported) RA0–RA12, CA0–CA7
64M bit 4Banks SDRAM
— 16Mx4 with 4banks (not supported) RA0–RA11, CA0–CA9
— 8Mx8 with 4banks (supported) RA0–RA11, CA0–CA8
— 4Mx16 with 4banks (supported) RA0–RA11, CA0–CA7
2Mx32 (64M bit) SDRAM
— 2Mx32 with 4banks (supported) RA0–RA10, CA0–CA7
100 Pin DIMM Module SDRAM
KMM330S104CT
— 1Mx32 based on 2 1Mx16 2banks components RA0–RA10, CA0–CA7

rootlinger 发表于 2005-12-22 10:28

并且,我们在lumit的板子上,把原有的两个4M,共16Mbyte的片子,换成两个8M16bit,共32M的内存片子,经过设置后,在sdram里面可以运行程序。但有个现象,就是当把sdram bank0设置为16bit即半字方式工作时,在sdram中可以稳定的运行小程序。但把sdram bank0设置为32bit即全字方式工作时,在sdram中也可以运行小程序.但不是很稳定,就是说,有时候可以运行,有时候则不行.不知道啥原因,呵...
  还有就是有没有好的方法,通过std测试程序,能测试内存的大小了? :-D  :-D  :-D 请高手们指点!

lumit-support-1 发表于 2005-12-24 15:51

“换成两个8M16bit,共32M的内存片子”
8M×16bit的SDRAM4510并不支持啊,也许能用,会不会有4510寻址不到的内存空间啊??

rootlinger 发表于 2005-12-25 11:17

作了一个memtest的程序,可以访问到25M的大小,以上好像访问不到,因这个与配置有关,所以我怀疑自己的配置是不是有问题.
并且,网上有人好像做了两个8M16bit,共32M的内存片子,在4510上,并且在卖

lumit-support-1 发表于 2005-12-25 14:20

是嘛?那你查到相关的SDRAM的配置了嘛?一块研究啊!!

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