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AR# 13201

12.1 Speed File - What does the Twos timing parameter/symbol stand for? (Tshcko16, Tshcko32)

Description

Keyword: TWR, Timing Analyzer, TRCE, Tshcko, RAM, report  

 

Below is a snippet of a timing report (.twr/.twx) file: 

 Timing Report Example
Timing Report Example
 

 

What does the "Twos" symbol mean?

Solution

The Twos symbol is the same as Tshcko16, Tshcko32, or Treg in the data sheet. See the Virtex-E data sheet: http://www.xilinx.com/support/documentation/virtex-e_data_sheets.htm.
 

"Tshcko16/32" denotes clock-to-out of Distributed RAM during a WRITE command. "Treg" denotes clock-to-out of a shift register (SRL16). 

 

The Twos value can vary depending on the output path of the RAM or SRL. 

 

For example, the delay of the RAM output going directly to the X/Y output pin of the slice is different from the delay of the same RAM going to MUXF5 before being output to the slice's X/Y pin.

AR# 13201
Date Created 08/29/2007
Last Updated 05/14/2014
Status Archive
Type General Article