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Development System Reference Guide www.xilinx.com 239
OFFSET Constraints
R
Data Sheet report:
-----------------
All values displayed in nanoseconds (ns)
Setup/Hold to clock clk
---------------+------------+------------+
| Setup to | Hold to |
Source Pad | clk (edge) | clk (edge) |
---------------+------------+------------+
ad0 | -0.013(R)| 0.325(R)|
ad1 | -0.013(R)| 0.325(R)|
ad10 | -0.013(R)| 0.325(R)|
ad11 | -0.013(R)| 0.325(R)|
.
.
.
---------------+------------+------------+
Clock clk to Pad
---------------+------------+
| clk (edge) |
Destination Pad| to PAD |
---------------+------------+
d0 | 9.563(R)|
---------------+------------+
Timing summary:
---------------
Timing errors: 1 Score: 587
Constraints cover 19 paths, 0 nets, and 21 connections (100.0% coverage)
Design statistics:
Maximum path delay from/to any node: 8.587ns
Maximum input arrival time after clock: 9.224ns
Analysis completed Mon Jun 03 17:57:24 2005
-----------------------------------------------------------------
OFFSET Constraints
OFFSET constraints define Input and Output timing constraints with respect to an initial
time of 0ns.
The associated PERIOD constraint defines the initial clock edge. If the PERIOD constraint
is defined with the attribute HIGH, the initial clock edge is the rising clock edge. If the
attribute is LOW, the initial clock edge is the falling clock edge. This can be changed by
using the HIGH/LOW keyword in the OFFSET constraint. The OFFSET constraint checks
the setup time and hold time. For additional information on timing constraints, please
refer to the Constraints Guide at http://www.xilinx.com/support
under Documentation,
Software Manuals.