External Memory Interface Handbook Volume 3: Reference Material

ID 683841
Date 7/24/2019
Document Table of Contents AFI Address and Command Timing Diagrams

Depending on the ratio between the memory clock and the PHY clock, different numbers of bits must be provided per PHY clock on the AFI interface. The following figures illustrate the AFI address/command waveforms in full, half and quarter rate respectively.

The waveforms show how the AFI command phase corresponds to the memory command output. AFI command 0 corresponds to the first memory command slot, AFI command 1 corresponds to the second memory command slot, and so on.

Figure 63. AFI Address and Command Full-Rate

Figure 64. AFI Address and Command Half-Rate

Figure 65. AFI Address and Command Quarter-Rate

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