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AR# 32697

11.1 EDK, PPC440MC_DDR2 - How many memory ranks does the PPC440MC_DDR2 controller support?

Description

How many memory ranks does the PPC440MC_DDR2 controller support?

It is unclear in the data sheet, as there is a C_NUM_RANKS_MEM parameter, and a section on allowing up to four external ranks of memory.

解决方案

The PPC440MC_DDR2 only supports a single rank. Using more than one rank will not assert the external CS_n signal correctly, and is not currently planned to be fixed.

The documentation will be updated to support only single rank memory layouts, starting in PPC440MC_DDR2 v2.00.b.

AR# 32697
创建日期 05/12/2009
Last Updated 12/15/2012
状态 Active
Type 综合文章