UPGRADE YOUR BROWSER

We have detected your current browser version is not the latest one. Xilinx.com uses the latest web technologies to bring you the best online experience possible. Please upgrade to a Xilinx.com supported browser:Chrome, Firefox, Internet Explorer 11, Safari. Thank you!

AR# 54561

Vivado Timing Analysis - How does Vivado timing analysis calculate worst-case timing values if I do not know the temperature grade?

Description

How does Vivado timing analysis calculate worst-case timing values if I do not know the temperature grade for a part?

Solution

If a military-grade part and a commercial-grade part are run at the same temperature, the military-grade part (which has the same speed grade as the commercial-grade part) is faster.

A part with a higher temperature grade (i.e., the military-grade part) will run up to the same speed at the maximum military temperature limit as a part with a lower temperature grade (i.e., the commercial-grade part) will run at its lower maximum temperature limit. If the military-grade part is run at the commercial temperature limit, it will be faster than the commercial-grade part at that same temperature.

When a Xilinx temperature-grade part is operated at its upper temperature limit, it is guaranteed to perform according to the worst-case delays indicated in its speeds file.

The Xilinx timing and simulation models are guaranteed under the following worst-case conditions:

  • Minimum Voltage (VCCINT or VCCO) - Ordering Information in the data sheet for each device family
  • Maximum Junction Temperature is in the Ordering Information in the data sheet for each device family

Output Loading:

50 pF (or capacitive loading for the default I/O Standard)

For additional information, see (Xilinx Answer 4235).
AR# 54561
Date Created 02/25/2013
Last Updated 08/07/2013
Status Active
Type General Article
Devices
  • Artix-7
  • Virtex-7
  • Kintex-7
Tools
  • Vivado Design Suite - 2012.1
  • Vivado Design Suite - 2012.2
  • Vivado Design Suite - 2012.3
  • More
  • Vivado Design Suite - 2012.4
  • Vivado Design Suite - 2013.1
  • Vivado Design Suite - 2013.2
  • Less