rootlinger 发表于 2005-11-8 14:12:01

4510b外接SDRAM的内存大小？

版主，我在4510的RAMbank0 上外接了两片4M16bit的hy57v641620HG芯片,设置DRAMcon0 为0x20000380, 启动uClinux后,怎么显示8M内存? 应该是16M word才是啊?
还有,我现在想在RAMbank0上外接32MSDRAM,怎么接?能不能接?给各建议?多谢!

lumit-support-1 发表于 2005-11-9 00:08:19

数据总线的宽度修改了吗？
32M我想应该可以的

whuhu 发表于 2005-11-22 01:29:21

看4510的说明书，好象最大只能支持单片64Mbit

lumit-support-1 发表于 2005-11-22 23:14:18

4510的寻址范围没有那么小吧，寻址范围是64M吧

whuhu 发表于 2005-11-22 23:58:06

请看4-54页
S3C4510B can support below SDRAM configuration for 1 bank.
· 2MBytes to 1 bank ® 1 ´ (2Mx32 with 4banks)
· 4MBytes to 1 bank ® 2 ´ (1Mx16 with 2banks)
· 8MBytes to 1 bank ® 4 ´ (2Mx8 with 2banks)
· 16MBytes to 1bank ® 2 ´ (4Mx16 with 2/4banks)
· 32MBytes to 1bank ® 4 ´ (8Mx8 with 2/4banks)
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
页: [1]
查看完整版本: 4510b外接SDRAM的内存大小？