[sv-bc] RE: iff timing

The LRM says that en is evaluated when clk changes. There is no implied sampling of en, so you would get a race if en changes at the same timepoint. Of course if you use a construct that provides a guaranteed ordering within the same timestep, like a clocking block, then there would be no race.

From: owner-sv-bc@eda.org [mailto:owner-sv-bc@eda.org] On Behalf Of Bresticker, Shalom
Sent: Monday, August 11, 2014 4:05 AM
To: sv-bc@eda.org
Subject: [sv-bc] iff timing

In the expression '@(exp1 iff exp2)', is there a required timing relation of the sampling of exp2 relative to exp1?

For example, in '@(clk iff en)', what happens if en changes in the same timepoint as clk?

Thanks,
Shalom

Shalom Bresticker
Communications & Storage Infrastructure Group Design Automation
Intel Jerusalem, Israel
+972  2 589 6582 (office)
+972 54 721 1033 (cell)
http://www.linkedin.com/in/shalombresticker
The devil is in the details.


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