Procedural assignment

In a recent paper Ostrovsky has criticized my claiming that electrons cannot strictly have quantum numbers assigned to them in a many-electron system (Ostrovsky, 2001). His point is that the Hartree-Fock procedure assigns all the quantum numbers to all the electrons because of the permutation procedure. However this procedure still fails to overcome the basic fact that quantum numbers for individual electrons such as t in a many-electron system fail to commute with the Hamiltonian of the system. As aresult the assignment is approximate. In reality only the atom as a whole can be said to have associated quantum numbers, whereas individual electrons cannot. 

Uses may include the calibration of a measurement system, assessment of a measurement procedure, assigning values to other materials and quality control. 

There is no formal system to ensure that corrective and preventative measures resulting from OOS investigations are carried out. There is no written procedure assigning specific roles and responsibilities to designated personnel. There was no documented evidence that the CAPA (Corrective and Preventative Actions) was actually implemented. 

Here is an example of a blocking procedural assignment statement. 

The blocking procedural assignment statement describes an adder that takes Preset and the integer 1 as inputs and places the result in the variable Count. 

Procedural assignments can appear within an initial statement as well however an initial statement is not supported for synthesis. 

Figure 2-2 Combinational circuit from blocking procedural assignment.

Figure 2-3 Combinational logic from non-blocking procedural assignment.

Any kind of delay, delay control or intra-statement delay, specified in a procedural assignment (blocking or non-blocking) is ignored by a synthesis system. This can potentially lead to a functional mismatch between the design model and its synthesized netlist. 

An always statement is used to model the procedural behavior of a circuit. Here is an example of an always statement that contains procedural assignment statements. 

Let us now look at the same example when blocking procedural assignments are used. 

So we see that if a variable is assigned a value in one always statement and its value read external to that always statement, the assignment should be a non-blocking procedural assignment. 

Procedural Assignments Supported Time declaration is not supported. Timing controls as delays are ignored. Timing controls as events are not supported. 

Establish Site Validation Steering Committees to prepare an inventory of systems, set priorities, establish site validation master plans, approve validation procedures, assign resources, and monitor progress. 

---