Visible to Intel only — GUID: sam1403478547980
Ixiasoft
Visible to Intel only — GUID: sam1403478547980
Ixiasoft
7.4.6.2. DQS Delay Chain
DQS delay chains consist of a set of variable delay elements to allow the input DQS/CQ /CQn/QK# signals to be shifted by the amount specified by the DQS phase-shift circuitry or the logic array.
There are two delay elements in the DQS delay chain that have the same characteristics:
- Delay elements in the DQS logic block
- Delay elements in the DLL
The DQS/CQ/CQn/QK# pin is shifted by the DQS delay settings.
The number of delay chains required is transparent because the UniPHY IP automatically sets it when you choose the operating frequency.
In Arria® V GX, GT, and GZ devices, if you do not use the DLL to control the DQS delay chains, you can input your own gray-coded 7 bit settings using the delayctrlin[6..0] signals available in the UniPHY IP.
In the Arria® V SX and ST devices, the DQS delay chain is controlled by the DQS phase-shift circuitry only.