6.4. User APB Interface Timing
Unlike the AXI4 interface which provides for high-bandwidth, main band operations and where each HBM pseudo-channel maps to its own dedicated AXI4 port, the APB interface provides for relatively low-bandwidth sideband operations. (For example, to provide an alternative means of controlling refreshes without colliding with the main traffic stream, and for issuing custom commands useful for debugging.) Another difference is that the APB bus interface commands can target one or both Pseudo Channels at the same time, as there is one APB interface per HBM2 channel or two HBM2 Pseudo Channels.
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