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Reporting Clock Skew in ICC

  • strict warning: Non-static method view::load() should not be called statically in /var/www/drupal_module/views/views.module on line 906.
  • strict warning: Declaration of views_handler_filter::options_validate() should be compatible with views_handler::options_validate($form, &$form_state) in /var/www/drupal_module/views/handlers/views_handler_filter.inc on line 0.
  • strict warning: Declaration of views_handler_filter::options_submit() should be compatible with views_handler::options_submit($form, &$form_state) in /var/www/drupal_module/views/handlers/views_handler_filter.inc on line 0.
  • strict warning: Declaration of views_handler_filter_node_status::operator_form() should be compatible with views_handler_filter::operator_form(&$form, &$form_state) in /var/www/drupal_module/views/modules/node/views_handler_filter_node_status.inc on line 0.
  • strict warning: Declaration of views_plugin_row::options_validate() should be compatible with views_plugin::options_validate(&$form, &$form_state) in /var/www/drupal_module/views/plugins/views_plugin_row.inc on line 0.
  • strict warning: Declaration of views_plugin_row::options_submit() should be compatible with views_plugin::options_submit(&$form, &$form_state) in /var/www/drupal_module/views/plugins/views_plugin_row.inc on line 0.
  • strict warning: Non-static method view::load() should not be called statically in /var/www/drupal_module/views/views.module on line 906.
  • strict warning: Non-static method view::load() should not be called statically in /var/www/drupal_module/views/views.module on line 906.
  • strict warning: Non-static method view::load() should not be called statically in /var/www/drupal_module/views/views.module on line 906.
  • strict warning: Declaration of views_handler_field_comment::init() should be compatible with views_handler_field::init(&$view, $options) in /var/www/drupal_module/views/modules/comment/views_handler_field_comment.inc on line 0.
  • strict warning: Declaration of views_handler_filter_boolean_operator::value_validate() should be compatible with views_handler_filter::value_validate($form, &$form_state) in /var/www/drupal_module/views/handlers/views_handler_filter_boolean_operator.inc on line 0.

In ICC, we can report clock skew using following 3 commands: report_clock, report_clock_timing, report_clock_tree. Here is the differenc using those three command to report clock skew.

1. report_clock -skew

Reports the skew constraints for the clock set by the set_clock_uncertainty command.

2. report_clock_timing -type skew

Reports the actual local clock skew, that is, the skew between two flipflops of that clock, which has a timing path between the flipflops. This report is more useful to determine the real effect of the clock skew.

3. report_clock_tree -summary

Reports the actual global skew, which is the worst skew across the entire clock network. The report_clock_tree command is not OCV-aware and does not recognize set_timing_derate, whereas report_clock_timing -type skew is aware of both OCV and timing derating. Also, the report_clock_timing command does not consider float pin delays, whereas the report_clock_tree command considers float pin delays when reporting maximum global skew. 

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