Scratch DDR SDRAM Controller

I saw another post mentioning that to use this controller, it requires an external 100mhz clock. Is this true?

It synthesized, etc etc and programmed on my Spartan3E 500 board like a charm! One of the few projects that does that direct-from-download w/ no tweaking.

I'm getting L->R on the LEDS ON ON ON ON OFF ON OFF ON.

In order to use this code, where does a hobbyist get a 100mhz clock? I mean for use with the xilinx starter kit? I suppose I need some type of function generator?

Appreciate any help!

Keith

100Mhz clock already generated by the DCM clock2x right? if clock in put is 50Mhz.

By default it should read on on on on on off off on.

• 11111001

Didn't work on my microblaze S1600e board correctly.

Compiled using webpack 9.1.03 and webpack 10.1.

I ran the webpack 9.1.03 version bit file first - no led lit up. Then I ran webpack 10.1 version bit file immediately. The leds lit up as per the written data (from 9.1.03 not 10.1). (I changed the data written for the 10.1 version.)

The problem is that the 9.1.03 version writes correctly but reads back wrong data (blank leds). Next ,the 10.1 bit file downloaded to the board fails the write process but reads back the data written into the ddr by the 9.1.03 bit file....The leds lit up.

Tried with a couple of data...similar results.

Will try with Webpack 11.1... hopefully works as intended.

Has anyone been sucessfully with ISE 11.5?

I tried it, but with Spartan-3E Starterkit, but no LED is flashing!