Common concepts of time series analysis

1,Clock setup time (TSU ):The so-called clock establishment time refers to the minimum time interval between data and the ready time before the clock arrives.

Altera'sTsuDefinition: Tsu = data delay-clock delay + micro Tsu

Micro Tsu:It refers to the internal creation time of a trigger, which is an inherent attribute of the trigger. Generally, the typical value is less than 1 ~ 2ns. The micro Tsu in Altera is the setup time, which is represented by tsetup. please differentiate it.

 

2,Clock hold time (th ):The clock holding time only ensures the minimum stable time of the valid clock along the correct data and enabling signal. The formula defined is: Th = clock delay-data delay + micro th

 

3,Clock-to-output delay (TCO ):This time refers to the minimum interval at which data is pushed to the output end of the synchronization time series path when the clock is effective along the change. TCO = clock delay + micro TCO + Data Delay

 

4,PIN to pin delay (TPD ):TPD refers to the delay when the input pin reaches the path of the output pin through the pure combination logic. It must be noted that only the combination logic is required between the input and output, which is the TPD delay.

 

5,Slack:It is a title that indicates whether the design meets the time sequence. A positive slack indicates that the time sequence is satisfied (the margin of the time sequence), and a negative slack indicates that the time sequence is not satisfied (the lack of time series ).
Slack = required clock period-actual clock period
Slack = slack clock period-(micro TCO + Data delay + micro TSU)

 

6,Clock skew:It refers to the time offset when a same-source clock reaches two different register clock ends.