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

ID 683665
Date 10/18/2023
Public
Document Table of Contents
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7.3.3. DQS Phase-Shift Circuitry

The Stratix® V phase-shift circuitry provides phase shift to the DQS/CQ and CQn pins on read transactions if the DQS/CQ and CQn pins are acting as input clocks or strobes to the FPGA. The DQS phase-shift circuitry consists of DLLs that are shared between multiple DQS pins and the phase-offset module to further fine-tune the DQS phase shift for different sides of the device.

The following figures show how the DQS phase-shift circuitry is connected to the DQS/CQ and CQn pins in the Stratix® V variants.

Figure 146. DQS/CQ and CQn Pins and DQS Phase-Shift Circuitry in Stratix® V E Devices


Figure 147. DQS/CQ and CQn Pins and DQS Phase-Shift Circuitry in Stratix® V GX, GS, and GT Devices


The DQS phase-shift circuitry is connected to the DQS logic blocks that control each DQS/CQ or CQn pin. DQS logic blocks allow the DQS delay settings to be updated concurrently at every DQS/CQ or CQn pin.