MCF5329 and 512 MB DDR DIMM

jacquesclaude — Mon, 17 Dec 2007 03:36:37 GMT

Hi there,

I am designing a board using the MCF5329 and would like to use a 200-pin DIMM DDR module with 512 Mbytes. I got the pin out for 200-pin connector. Can anybody tell me how to connect the 16-bit data bus from the MPU to the 64-bit datalines of the DIMM? Also I am not to sure about the DQS and the DM signals assignments. Are there any documentation or apnotes showing how to connect the MCF5329 to a DDR DIMM?

Jacques

Re: MCF5329 and 512 MB DDR DIMM

JWW — Sat, 29 Dec 2007 22:52:05 GMT

Jacques,

I don't think this will be good news for you. But the DDR industry has not be extremely easy on the embedded industry. On the old SDRAM DIMMs (SDR), you had two chipselects and could address the "high" or "low" 32 bits of the DIMM and therefore on an embedded processor you could connect/use two of your SDRAM controller's chipselects.

On DDR dimms, and I haven't double checked the 200pin version, I think you only have one chipselect. When you say 200 pin are you referring to the "laptop" style SODIMMS?

Anyway...the secret is in how the DIMM is split across one or multiple chipselects. Either way, the 16bit wide data bus on the 5329 is probably not going to hook to a normal over the counter DIMM without giving up some of the data bus width.

One piece of good news.

There is a 100 pin DDR DIMM standard that utilizes a 32 bit wide form factor. This will work with the 547x and 548x family.

There are also new standards for DDR2 DIMMs in both 16 bit wide and 32 bit wide form factors. This won't help you on your current DDR question, but could be of use in the future.

-JWW

topic Re: MCF5329 and 512 MB DDR DIMM in ColdFire/68K Microcontrollers and Processors

MCF5329 and 512 MB DDR DIMM

Re: MCF5329 and 512 MB DDR DIMM