Understanding Address Map

Question

Please refer to page 113 of http://www.xilinx.com/support/documentation/user_guides/ug585-Zynq-7000-TRM.pdf

I'm not understanding this table. From what I can tell, I have from 0010_0000 to 3FFF_FFF of DDR memory, which is 1 072 693 247 bytes and approximately 1 Gbyte of memory available to write into the DDR, correct? I thought the Zedboard had only 512 Mbytes of DDR memory...

Also, in that table, it says that I have approximately 2Gbytes (4000_0000 to BFFF_FFFF) of address available for PL. What does this space mean exactly? What can I save in here?

Thank you

Former Member · Accepted Answer

Hello,

4G is the maximum addressable area given that there are 32 address bits. The table referred to by jmales above maps how that 4G of address space is allocated for use in the Zynq device.

512M is the actual amount of DDR memory that is physically installed on the ZedBoard. Other Zynq based boards may have more, or less, DDR memory.

-Gary