Timing Analysis

[shyking]

the quartus provides the function to analyze the removal & recovery timing,

is there this function in the ise ?

thanks

[eteam00]

What is being removed and recovered?

-- Bob Elkind

[rcingham]

From:
http://www.altera.com/support/software/timequest/clock/tq-clock.html

"Recovery time is the minimum length of time an asynchronous control signal, for example, and preset, must be stable before the next active clock edge. The recovery slack time calculation is similar to the clock setup slack time calculation, but it applies asynchronous control signals. If the asynchronous control is registered, the TimeQuest analyzer uses Equation 7 to calculate the recovery slack time."

"Removal time is the minimum length of time an asynchronous control signal must be stable after the active clock edge. The TimeQuest analyzer removal time slack calculation is similar to the clock hold slack calculation, but it applies asynchronous control signals. If the asynchronous control is registered, the TimeQuest analyzer uses the equations shown in Equation 9 to calculate the removal slack time."

[ajmirg]

 The recovery slack time calculation is similar to the clock setup slack time calculation, but it applies asynchronous control signals.

Enabling Path Tracing Controls turns on analysis of latches/asynchronous signals in PERIOD and OFFSET or unconstrained path analysis.

 

Use ENABLE and DISABLE constraints in the UCF. Check the Constraints Guide.

 

reg_sr_o - Combinatorial asynchronous output path - combinatorial path through Flop

reg_sr_r - Reset Recovery Timelat_d_q - combinatorial latch through D pin to Q output

lat_ce_q - combinatorial latch through GE pin to Q output

Some PTC are enabled by default but others should be enabled using the ENABLE constraint (See Constraints Guide). For disabling a particular PTC, please use DISABLE constraint.

Timing Analyzer can also enable and disable individual PTC when doing Post Route analysis.