4.3   DESIGN PROCESS FLOW: THE PROGRAMMABLE LOGIC DEVICE ROUTE

A typical programmable logic device (PLD) design process flow is shown in Figure 4–6. The starting specification might be informal and hand drafted in anything from an HDL to a collection of Boolean equations. Design capture moves the design into the CAD environment and requires the engineer to restate the creation for machine consumption. This might be preparing a file in a preferred notation or marking entries in a table. Synthesis and optimization uses algorithms to manipulate the logic design to improve it by exploiting don’t care states to minimize the number of gates used. Function verification may be a unit-delay simulator to generate circuit outputs, or may amount to a manual inspection of truth table data. Device fitting matches logic/gate demand and input/output (I/O) demand to part family members. Finally, physical design produces manufacturing data, a binary stream, for programming specific devices. This must be achieved by generating a layout of the required circuit in the chosen FPGA cell and wire scheme. It may amount to running a simple logic block generator or it may be placing and routing random logic using manual and automatic software tools.

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Figure 4–6. PLD design process flow.

4.3.1   Conceptual Design of Display Driver

In the case of a CAL design the specification is given in Table 4–2. The minimization ...

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