18.2.1 Naming Conventions for Flip-Flops

The names for the flip-flop cells are composed of the following four parts:

• A base name identifying the cell as a D-type flip-flop (DFF)
• An optional 1-character code describing the clock pin. L indicates negative edge trig-gered. No code indicates positive edge triggered
• Asynchronous input type and polarity; an optional 1-character code designating the control pins as follows:

  • B = Active high, both set and clear

  • C = Active high clear

  • S = Active high set

  When omitted, the cell has neither SET nor CLEAR input.

• An optional 1-character code describing the output. I indicates output is inverted. No code indicates output is not inverted.