i.MX Processorsのトピックimx535 LPDDR2 Connection, any help?

imx535 LPDDR2 Connection, any help?

danix — Wed, 14 Dec 2011 13:32:53 GMT

Hey all,

I know I'm posting this for the third time, but I need to make sure connecting micron 4Gb LPDDR2

with imx535(529-BGA). I'm stuck here...

The DDR has multiplexed command/address line CA[9:0]... how am I going to connect this to the DDR controler in mx53?

Re: imx535 LPDDR2 Connection, any help?

aven_tsao — Wed, 04 Jan 2012 02:57:36 GMT

Dear Sir:

Since the DRAM Address bus are used for Address and Command transfer.

So, please connect CA[9:0] to MX53 DRAM[9:0]

Aven Tsao

Re: imx535 LPDDR2 Connection, any help?

aven_tsao — Wed, 04 Jan 2012 05:20:42 GMT

Sorry for my mistake, please connect CA[9:0] to MX53 DRAM_A[9:0]

Aven

Re: imx535 LPDDR2 Connection, any help?

danix — Wed, 04 Jan 2012 06:03:58 GMT

Aven,

Thank you for your reply. The address and data connection is is not a concern; It's a little obvious, don you think?

I was rather concerned about the power supply. The LPDDR2 needs two different levels, 1.2V and 1.8V and the datasheet suggested the 1.8V be ramped first. Using the MC34708 PMIC, how I'm I going to do that and which source should be used for the 1.8V?

PS: I'm using the Micron MT42L128M32D2: 4Gb, LPDDR2 PoP