## Assigning Pins, Logic Cells & Chips

You can assign a single logic function to a specific pin or logic cell (including I/O cells and embedded cells) within a chip, and assign one or more functions to a specific chip. A chip is a group of logic functions defined as a single, named unit, which can be assigned to a specific device.

You can assign a signal to a particular pin to ensure that the signal is always associated with that pin, regardless of future changes to the project. If you wish to set and maintain the performance of your project, assigning logic to a specific logic cell within a chip can minimize timing delays. In a project that is partitioned among multiple devices, you can assign logic functions that must be kept together in the same device to a chip. Chip assignments allow you to split a project so that only a minimum number of signals travel between devices, and to ensure that no unnecessary device-to-device delays exist on critical timing paths. You can assign a chip to a device in some EDA tools or in the MAX+PLUS® II software.

Use the following syntax for chip, pin, and logic cell assignments:

- To assign a logic function to a chip:

  `CHIP_PIN_LC=`<chip name>

  For example: `CHIP_PIN_LC=chip1`

- To assign a pin number within a chip:

  `CHIP_PIN_LC=`<chip name>`@`<pin number>

  For example: `CHIP_PIN_LC=chip1@K2`

- To assign a logic cell, I/O cell, or embedded cell number:

  `CHIP_PIN_LC=`<chip name>`@LC`<logic cell number>

  `CHIP_PIN_LC=`<chip name>`@IOC`<I/O cell number>

  `CHIP_PIN_LC=`<chip name>`@EC`<embedded cell number>

  For example: `CHIP_PIN_LC=chip1@LC44`

| Refer to the following sources for additional information:

- Go to "Devices & Adapters" and "Assigning a Device" in MAX+PLUS II Help for information on device pin-outs and assigning devices, respectively, in the MAX+PLUS II software.
- Go to Back-Annotating MAX+PLUS II Pin Assignments to Design Architect Symbols for information on back-annotating pin assignments in Mentor Graphics Design Architect schematics.

Last Updated: March 24, 2000 for MAX+PLUS II version 9.6 |
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