External Memory Interface Handbook Volume 3: Reference Material

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

2.17.3.6. AFI Tracking Management Signals

When tracking management is enabled, the sequencer can take control over the AFI 4.0 interface at given intervals, and issue commands to the memory device to track the internal DQS Enable signal alignment to the DQS signal returning from the memory device. The tracking management portion of the AFI 4.0 interface provides a means for the sequencer and the controller to exchange handshake signals.
Table 36.  Tracking Management Signals 

Signal Name

Direction

Width

Description

afi_ctl_refresh_done

Input

4

Handshaking signal from controller to tracking manager, indicating that a refresh has occurred and waiting for a response.

afi_seq_busy

Output

4

Handshaking signal from sequencer to controller, indicating when DQS tracking is in progress.

afi_ctl_long_idle

Input

4

Handshaking signal from controller to tracking manager, indicating that it has exited low power state without a periodic refresh, and waiting for response.

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