Question about the HandBook

[Altera_Forum]

Hi, all: 

 In "quartus II, HB 10.1, Vol 3, quartus II, HB 10.1, Vol 3, Chap 6 The Quartus II TimeQuest Timing Analyzer", there's Equation 7-1: input delayMAX = ( cd_extMIN – cd_altrMAX) + tco_extMAX + ddMAX input delayMIN = (cd_extMAX – cd_altrMIN) + tco_extMIN + ddMIN  I think it should be like this: input delayMAX = (cd_extMAX – cd_altrMIN) + tco_extMAX + ddMAX input delayMIN = (cd_extMIN – cd_altrMAX) + tco_extMIN + ddMIN  The attachment is the figure.https://www.alteraforum.com/forum/attachment.php?attachmentid=4413

[Altera_Forum]

Wow. The output delay looks incorrect too. I believe it should be: 

output delayMAX = ddMAX + tsu_ext + cd_altrMAX – cd_extMIN output delayMIN = ddMIN – th_ext + cd_altrMin – cd_extMAX

[Altera_Forum]

Hi, Rysc: 

 Thank you for your confirmation.

[Altera_Forum]

I don't think so. I believe the equations are correct. 

 input delayMAX (IMD) = tCO_extMAX + ddMAX - tCS_MIN input delayMIN (ImD) = tCO_extMIN + ddMIN - tCS_MAX  where tCS_MIN (minimum clock skew) = MAX tCLK (destination) - MIN tCLK (source)  = cd_altrMAX - cd_extMIN (for inputs) and tCS_MAX (maximum clock skew) = MIN tCLK (destination) - MAX tCLK (source)  = cd_altrMIN - cd_extMAX  therefore,  input_delayMAX = tCO_extMAX + ddMAX - tCS_MIN  = tCO_extMAX + ddMAX - (cd_altrMAX - cd_extMIN)  = tCO_extMAX + ddMAX + cd_extMIN - cd_altrMAX and  input_delayMIN = tCO_extMIN + ddMIN - tCS_MAX  = tCO_extMIN + ddMIN - (cd_altrMIN - cd_extMAX)  = tCO_extMIN + ddMIN + cd_extMAX - cd_altrMIN  Similar equations apply to the output delays.

[Altera_Forum]

@nju044, 

 Rysc and I have discussed this at length offline, and I now agree with him. The equations in the Handbook (and also on my "cheat sheet" which was copied from the Handbook many years ago) appear to be incorrect.