AR# 38871

Virtex-5 - IDELAY - Why is the RST grounded in the .ncd when fixed tap-delay mode is used?

Description

Why is the RST grounded in the .ncd when fixed tap-delay mode is used?

Solution

The IDELAY's RST is used to reset the delay chain to a pre-programmed value. When fixed mode is used the delay value is set to a number specified by the IOBDELAY_VALUE and cannot be reset.
AR# 38871
Date 12/15/2012
Status Active
Type General Article
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