Editing the synthesis parameters

The synthesis parameters can be divided into:

• general optimization parameters (for combinatorial and sequential circuits);

• parameters specific for the sequential circuits;

• parameters specific for the DGD files;
  (not yet available for modifying into the grafic version dgc_gui, they are available only with the not graphical version of the program: dgc).

To modify the synthesis parameters:

• Choose from the main menu Edit->Synthesis Parameters;
• Select the required ones from the "Synthesis Parameters..." dialog box;
  

• Click the OK button.

In the picture of the "Synthesis Parameters..." dialog box are shown the default values for these parameters.

The following synthesis parameter are avilable:

2 level minimization

Minimizes the boolean expression before creating the generic netlist.

Multi level optimization

Tries to find common subexpressions before creating the generic netlist.

Net cache optimization

Collects common subexpressions while creating the generic netlist.

Generic cell optimization

Applies several algorithms to reduce the generic netlist.

Technology optimization

Applies several algorithms after technology mapping.

State machine type

DGC can create synchronous or asynchronous (burst-mode) state machines.

Reset type

Selects how to reset the state machine. This option is valid for synchronous and asynchronous state machines.

Delay correction

Only for asynchronous state machines: Disable the delay correction of the feedback lines. This will probably create an invalid digital circuit.

Use output as feedback lines

Only for asynchronous state machines: Use output lines for state encoding of asynchronous state machines.

Delay path construction

Create additional delay chain with a delay that is larger than the longest path of the design.