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- OUTPUT_ENABLE
- Overview
- This reserved word selects the output-enable function of the
- preset/enable pin.
-
-
- Syntax──────────────────────────────────────────────────────────────
-
- OUTPUT_ENABLE
- ────────────────────────────────────────────────────────────────────
-
- Device Support: PLS105 PLS167 PLS168
- ·
- Syntax
- Use this reserved word in the state segment of state-machine designs.
-
- Syntax──────────────────────────────────────────────────────────────
-
- OUTPUT_ENABLE
- Example─────────────────────────────────────────────────────────────
-
- STATE
- ;State Setup and Defaults
- ...
- MEALY_MACHINE
- OUTPUT_ENABLE
- OUTPUT_HOLD
- ;State Bit Assignment
- ...
- ────────────────────────────────────────────────────────────────────
- ·
- Definitions
-
- OUTPUT_ENABLE This sets the preset/enable pin to output enable.
- You can place OUTPUT_ENABLE anywhere in the setup and
- default section. It must precede the state assignment
- and transition equations.
- ·
- Use
- When you use OUTPUT_ENABLE, the software dedicates the preset/enable
- pin to active-low output enable. Conversly, when you use
- MASTER_RESET, the software dedicates the preset/enable pin to
- active-high preset. You cannot use both OUTPUT_ENABLE and
- MASTER_RESET in the same design file. Follow the guidelines
- outlined next.
-
- ■ If you do not use MASTER_RESET or OUTPUT_ENABLE, the software
- selects preset as the default.
-
- ■ If you write a .SETF equation and do not use MASTER_RESET or
- OUTPUT_ENABLE, the software selects preset.
-
- ■ If you write a .TRST equation, the software selects output
- enable.
- ·
- Related Topics
- MASTER_RESET
- STATE
- ·
-