---
page_id: wsd-constant-inputs-in-sdc-77f572d4
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title: "Thread: Constant inputs in SDC"
slug: wsd-constant-inputs-in-sdc-77f572d4
route: /evidence/i-information/questions/threads/constant-inputs-in-sdc
section: reference
access: public
summary: 2 Discord messages from ℹ️ - Information/⁉️-questions/threads/constant-inputs-in-sdc.md.
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tags: [discord, wafer-space, archive]
last_updated: 2026-08-19
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---

# Thread: Constant inputs in SDC

Category: **ℹ️ - Information**
Parent channel: **#⁉️-questions**
Thread ID: `1436125469295513752`

Messages: **2**

## message-1436125469295513752

**2025-11-06T22:49:53.801+00:00 — Tholin (@tholin)**

- Message ID: `1436125469295513752`
- Author ID: `220639106915368960`
- Nickname: Tholin
- User name: tholin
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1436125469295513752/1436125469295513752
- Archive source: https://discord.wafer.space/wafer-space/%E2%84%B9%EF%B8%8F%20-%20Information/%E2%81%89%EF%B8%8F-questions/constant-inputs-in-sdc/2025-11/2025-11.json
- Archive source: https://discord.wafer.space/wafer-space/Information/questions/constant-inputs-in-sdc/2025-11/2025-11.json

**Content**

```text
So, this would be more of a "nice to have" for my project to make the results of top-level timing analysis look a bit neater, but my die is a multi-project die, with 5 input-only pins providing project selection through a multiplexer. However, during top-level timing analysis, STA considers changes on the project select inputs in-between clock ticks. As the chip is designed to have those pads permanently bonded/wired to power or ground according to the desired selection, they should be considered constants for the purpose of timing analysis. But how do I codify this in my .sdc file?
```

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## message-1436229763269263403

**2025-11-07T05:44:19.422+00:00 — Leo Moser (mole99) (@mole99)**

- Message ID: `1436229763269263403`
- Author ID: `323371864074485771`
- Nickname: Leo Moser (mole99)
- User name: mole99
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1436125469295513752/1436229763269263403
- Archive source: https://discord.wafer.space/wafer-space/%E2%84%B9%EF%B8%8F%20-%20Information/%E2%81%89%EF%B8%8F-questions/constant-inputs-in-sdc/2025-11/2025-11.json
- Archive source: https://discord.wafer.space/wafer-space/Information/questions/constant-inputs-in-sdc/2025-11/2025-11.json

**Content**

```text
You can ignore a timing path using `set_false_path`.
```

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