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amir.massah
Adventurer
Adventurer
392 Views
Registered: ‎10-12-2018

Spartan 6 - IDELAY Maximum Tap Number

Hi to all,

I am working with Spartan-6 IDELAY to deserialize a 200MHz DDR input stream (400Mbps). 

Based on the Spartan-6 data sheet (DS162) Table 39, I calculated the maximum number of taps for 400Mpbs (2.5ns period) as 62 taps. I am using the equation stated in the note. 2 of the table based on the speed grade -3. However, when I am playing with the IDELAYs by incrementing/decrementing the taps, I have found the number of taps is around 104.

Am I right in taps number calculation? If yes, then why the real number of taps is different?

Thank you.

Amir

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2 Replies
drjohnsmith
Teacher
Teacher
379 Views
Registered: ‎07-09-2009

have look here
https://www.xilinx.com/support/documentation/user_guides/ug381.pdf
page 71 / 72

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amir.massah
Adventurer
Adventurer
332 Views
Registered: ‎10-12-2018

Hi @drjohnsmith 

Thank you for your reply. 

I had read them before, but I am looking for the number of taps.

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