AN1356 STMicroelectronics, AN1356 Datasheet - Page 32

• Manufacturer Part Number: AN1356
• Description: PSDSOFT EXPRESS AND PSD4235G2 DESIGN GUIDE
• Manufacturer: STMicroelectronics

AN1356 - APPLICATION NOTE
Figure 34. User-defined Node Equations
Let’s establish all of the internal nodes used for this second design. They are:
Each internal node, either combinatorial or registered, will consume one Output MicroCell (OMC).
First we’ll define two registers to implement a 4-state state machine. Click on Def Node… Enter the name
“state_bit_0” and designate it as a register as shown here:
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Two register nodes for a 4-state state-machine — state_bit_0 and state_bit_1
One register node for a simple clock divider — half_clkin
Four register nodes for a down-counter — down_count0 to down_count3
Four register nodes to pre-load the down-counter — init_count0 to init_count3
One combinatorial node used as an intermediate node for down-counter — term_count