MMDC chip select in DDR3 with i.MX6DL

[ko-hey]

Hi all

My customer plan to use DDR3 and want to divide DDR memory by function.

For example, one is for boot and the other is for image buffering.

SABRE-SDP is following connection. (Figure 1)

My customer wanto to use following connection. (Figure 2)

However, according to the Table 45-13 of  IMX6SDLRM Rev. 2, 04/2015, MMDC support 2 channels only when user use LPDDR2.

Q1

Can we use like Figure 2 ?

Q2

If Q1 is yes, can we divide DDR memory by function ?

For example, one is for boot and the other is for image buffering.

Ko-hey

[gusarambula · Accepted solution]

Hello Ko-Hey,

You may use one Chip Select for both DDR chips, or one Chip Select for each DDR chip. Both figures presented are valid configurations. However, when using two Chip Selects the memories are mapped as a bigger combined memory, not as two separated memories.

I’m not familiar with implementations that use the configuration you mention, using a DDR chip for booting and system memory and another DDR chip dedicated to image buffering. You may use a dedicated memory location on your implementation though, which would be the closest to using each chip for a dedicated purpose.

I hope this information helps!

Regards,