Spartan® Family FPGAs

[sagarcrystal]

Hello all,

I am using Spartan 6 MCB`s (memory part number MT41J128M16-125), I have a problem while using that, I have found that all my four DDR`s are operating fine at 320 MHZ,  but I have to make them run at 400MHZ, while doing so MCB5 and MCB4 are working fine but  MCB 1 and MCB 3 are falling at 400 MHZ

It would be great if some one could give me some suggestions to make them work at 400 MHZ, I have tried to increase CAS latency and done some memory parameters alternations which never helped

here are the port configurations details

MCB1 - 32 bit 

MCB3 - 128 bit

MCB4 - 32 bit

MCB5 - 128 bit

Thank  you

Sagar Vikkurthi

[bwiec]

You will probably need to elaborate on what you mean by 'failing'

[gszakacs]

Are you aware of the Vccint requirements for running the MCB at 400 MHz?  Spartan 6

parts require a slightly higher (and tighter) voltage on the Vccint supply to meed the

400 MHz spec.  You should also be running the latest version of ISE and MIG to make

sure that the proper operating conditions and timing specs are enforced.

See:

http://www.xilinx.com/support/documentation/customer_notices/xcn10024.pdf

-- Gabor

[eteam00]

Spartan 6 parts require a slightly higher (and tighter) voltage on the Vccint supply to meed the 400 MHz spec.

The "Extended Performance" spec applies only to DDR2 devices used with Spartan-6 family.

The MT41J128M16 is a DDR3 device.

-3 speed grade supports DDR3 at up to 800 MT/s (400MHz).

-2 speed grade supports DDR3 at up to 667 MT/s (333MHz).

-- Bob Elkind

[sagarcrystal]

Thank you... I will check this alternative

[sagarcrystal]

I have increased Vccint value, my results are quiet better but not the best.
after discussing with my senior, I have changed parameters like C_MEM_DDR3_RTT (On Die Termination) values to higher which really helped it improve...

Thank you eteam00 and gszakacs for taking time to read my post and giving your valuable suggestions.


Thank you for your answers ....