FILE: Delay.mesa
Last edited by Ousterhout, July 5, 1983 12:01 pm
Christian LeCocq April 11, 1986 4:42:49 pm PST
This file defines the routines used by Crystal to do delay analysis.
Delay: CEDAR DEFINITIONS =
BEGIN
Propagate:
PROC[prevStage: Globals.Stage, globalVars: Globals.GlobalVars];
PrevStage gives information about a node that has changed value. This procedure looks for transistor gates and chip outputs whose values might change because of the change in the node. For each of these, new stages are created and analyzed recursively.
DelayCmd: Globals.CmdProc;
This command procedure invokes the delay calculations. There are three arguments. The first is the name of a node. The second is the time at which the node rises (-1 means that the node never rises) and the third is the time at which the node falls (-1 means that the node never falls).
Stats:
PROC[];
This routine prints out various statistics gathered during delay analysis.
Print:
BOOLEAN;
TRUE means print out the names of nodes when their delay times are updated. Only nodes whose first letters are alphabetic are printed.
PrintAll:
BOOLEAN;
TRUE means print out all nodes when their delay times change, regardless of whether the first letters are alphabetic.
BusThreshold:
REAL;
Threshold capacitance (in pfs) at which a node is considered to be a bus.
DelayLimit:
INT;
Limit of how many stages to examine before giving up delay analysis.
END.