10.1.12.1.1 Axcelerator DDR Register
The following image describes an axcelerator DDR register.

The following table describes the ports of an Input Buffer plus DDR Register for Axcelerator.
| Port Name | Size | Type | Required/Optional | Function |
|---|---|---|---|---|
| PAD | WIDTH | Input | Required | Input Data |
| QR | WIDTH | Output | Required | Output Data |
| QF | WIDTH | Output | Required | Output Data |
| E | 1 | Input | Required | Enable |
| CLK | 1 | Input | Required | Clock |
| CLR | 1 | Input | Required | Clear |
| PRE | 1 | Input | Required | Preset |
