About C6678 DDR3 DDRSLRATE[1:0]

g.f.

Hi,

I have a question about C6678 DDR3 DDRSLRATE[1:0] pin.

I'm looking at Hardware Design Guide page.95 Table24 Slew Rate Control.
There are 4 combination for DDRSLRATE[1:0] but I can't decide which
combination is the best for customer board.

From Hardware Design Guide and DDR3 Design Guide,
I can't decide which combination of DDRSLRATE[1:0] to select.

Is there any information which I could refer to
for deciding the combination?

best regards,
g.f.

over 12 years ago

0 Bill Taboada over 12 years ago

TI__Mastermind 42545 points

The only accurate method for determining the necessary slew rate is to simulate your layout. Most designs use the default "fast" setting without any problems.

0 g.f. over 12 years ago in reply to Bill Taboada

Guru 15510 points

Hi Bill, Thank you for answering my question.

So, if I need to determine slew rate,

is it possible to use C667x IBIS simulation?

best regards,

g.f.

0 Bill Taboada over 12 years ago in reply to g.f.

TI__Mastermind 42545 points

Yes, you can choose the model for each of the slew rates in your IBIS simulation to see which works best for your layout.

0 g.f. over 12 years ago in reply to Bill Taboada

Guru 15510 points

Hi Bill,

Thank you so much.

best regards,

g.f.

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About C6678 DDR3 DDRSLRATE[1:0]