Cyclone® V Device Handbook: Volume 1: Device Interfaces and Integration

ID 683375
Date 10/18/2023
Document Table of Contents

5.12.2. Serializer Bypass for DDR and SDR Operations

You can bypass the serializer to support DDR (x2) and SDR (x1) operations to achieve a serialization factor of 2 and 1, respectively. The I/O element (IOE) contains two data output registers that can each operate in either DDR or SDR mode.

Figure 108. Serializer BypassThis figure shows the serializer bypass path. In DDR mode, tx_inclock clocks the IOE register. In SDR mode, data is passed directly through the IOE. In SDR and DDR modes, the data width to the IOE is 1 and 2 bits, respectively.