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

ID 683665
Date 10/18/2023
Public
Document Table of Contents

7.2.2. DQ/DQS Bus Mode Pins for Stratix® V Devices

The following table list the pin support per DQ/DQS bus mode, including the DQS/CQ and DQSn/CQn pins. The maximum number of data pins per group listed in the table may vary according to the following conditions:

  • Single-ended DQS signaling—the maximum number of DQ pins includes parity, data mask, and QVLD pins connected to the DQS bus network.
  • Differential or complementary DQS signaling—the maximum number of data pins per group decreases by one. This number may vary per DQ/DQS group in a particular device. Check the pin table for the exact number per group.
  • DDR3 and DDR2 interfaces—the maximum number of pins is further reduced for an interface larger than x8 because you require one DQS pin for each x8/x9 group to form the x16/x18 and x32/x36 groups.
Table 64.  DQ/DQS Bus Mode Pins for Stratix® V Devices
Mode DQSn Support CQn Support

Parity or Data Mask

(Optional)

QVLD 13

(Optional)

Data Pins per Group Notes
Typical Maximum

x4

Yes 4 5 If you do not use differential DQS and the group does not have additional signals, the data mask (DM) pin is supported.

x8/x9

Yes Yes Yes Yes 8 or 9 11 Two x4 DQ/DQS groups are stitched to create a x8/x9 group, so there are a total of 12 pins in this group.

x16/x18

Yes Yes Yes Yes 16 or 18 23 Four x4 DQ/DQS groups are stitched to create a x16/x18 group; so there are a total of 24 pins in this group.

x32/x36

Yes Yes Yes Yes 32 or 36 47 Eight x4 DQ/DQS groups are stitched to create a x32/x36 group, so there are a total of 48 pins in this group.
13 The QVLD pin is not used in the UniPHY IP core.