External Memory Interfaces Intel® Cyclone® 10 GX FPGA IP User Guide

ID 683663
Date 3/29/2021

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3.1.5. I/O Lane

An I/O bank contains 48 I/O pins, organized into four I/O lanes of 12 pins each.

Each I/O lane can implement one x8/x9 read capture group (DQS group), with two pins functioning as the read capture clock/strobe pair (DQS/DQS#), and up to 10 pins functioning as data pins (DQ and DM pins). To implement x18 and x36 groups, you can use multiple lanes within the same bank.

It is also possible to implement a pair of x4 groups in a lane. In this case, four pins function as clock/strobe pair, and 8 pins function as data pins. DM is not available for x4 groups. There must be an even number of x4 groups for each interface.

For x4 groups, DQS0 and DQS1 must be placed in the same I/O lane as a pair. Similarly, DQS2 and DQS3 must be paired. In general, DQS(x) and DQS(x+1) must be paired in the same I/O lane.

Table 3.  Lanes Used Per Group
Group Size Number of Lanes Used Maximum Number of Data Pins per Group
x8 / x9 1 10
x18 2 22
x36 4 46
pair of x4 1 4 per group, 8 per lane
Figure 6. x4 Group

Figure 7. x8 Group

Figure 8. x18 Group

Figure 9. x36 Group