On Sep 10, 2010, at 12:56 AM, hacklu wrote: > I didn't understand the address mask. > it's said that: BR[BA] is the base address,the OR[AM] is the address mask, > "Provides masking for corresponding BRx bits. By masking address > bits independently, SDRAM devices of different size address ranges can be > used. Clearing > bits masks the corresponding address bit. Setting bits causes the > corresponding address > bit to be compared with the address pins. Address mask bits can be set or > cleared in any > order, allowing a resource to reside in more than one area of the address > map. SDAM can > be read or written at any time." > > how to understand it? > for instance, if my BR0[BA]=0111_0000_0000_0000_0, OR0[AM]=1111_1111_1111 > if I want to access the 0x70000000 or the 0x71000001.what address calculate > will be taken?
Can you let us know which chip you are looking at using? There is a bit of variation so its useful to know. - k _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@lists.ozlabs.org https://lists.ozlabs.org/listinfo/linuxppc-dev
