PHY Only Mode - 1.0 English

AXI High Bandwidth Memory Controller v1.0 LogiCORE IP Product Guide (PG276)

Document ID
PG276
Release Date
2021-08-06
Version
1.0 English

The AXI HBM Controller IP can be configured in PHY only mode. In this mode the AXI Switch and Memory Controllers in the HBM stacks are bypassed. You can use your own HBM controller to connect with the HBM IP in PHY only mode. A standard DFI (DDR PHY) interface, rather than an AXI interface, is given in PHY only mode. The following figure shows how to configure the IP in PHY only mode.

Figure 1. Configuring the IP in PHY Only Mode

In the HBM IP configuration options in the Vivado IDE a Controller and Physical Layer option is available in the Controller/PHY Mode field, which is the standard way to access the HBM IP through AXI user interfaces. The default value of this option is Controller and Physical Layer. This default option is for the full HBM IP. To configure the HBM IP in PHY only mode, select the Physical Layer Only value for Controller/PHY Mode field. After selecting Physical Layer Only, the Vivado IDE is updated, as shown in the following figure.

Figure 2. PHY Only Mode Configuration Options

Instead of memory controllers you can enable/disable PHYs in a given stack. The AXI slave interface selection is grayed out. Depending on the number of PHYs enabled, the corresponding DFI interfaces are activated as shown in the following figure.

Figure 3. DFI Interfaces

In PHY only mode, the following configuration option tabs are hidden because these tabs are only used for complete Controller and Physical Layer designs: Address Map Options, Reorder, Refresh and Power Saving Options, and Reliability Options. Only Example Design Options along with the main HBM Configuration Selection Options are available in Physical Layer Only mode.