External Memory Interface Handbook Volume 3: Reference Material

ID 683841
Date 7/24/2019
Public
Document Table of Contents

5.5.1. Interconnections

The hard PHY resides on the device between the hard controller and the I/O register blocks. The hard PHY is instantiated or bypassed entirely, depending on the parameterization that you specify.

The hard PHY connects to the hard memory controller and the core, enabling the use of either the hard memory controller or a software-based controller. (You can have the hard controller and hard PHY, or the soft controller and soft PHY; however, the combination of soft controller with hard PHY is not supported.) The hard PHY also connects to the I/O register blocks and the DQS logic. The path between the hard PHY and the I/O register blocks can be bypassed, but not reconfigured—in other words, if you use the hard PHY datapath, the pins to which it connects are predefined and specified by the device pin table.

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