External Memory Interface Handbook Volume 3: Reference Material

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

1.7.1.3. Nios II-based Sequencer SCC Manager

The scan chain control (SCC) manager allows the sequencer to set various delays and phases on the I/Os that make up the memory interface. The latest Intel® device families provide dynamic delay chains on input, output, and output enable paths which can be reconfigured at runtime. The SCC manager provides the calibration routines access to these chains to add delay on incoming and outgoing signals. A master on the Avalon-MM interface may require the maximum allowed delay setting on input and output paths, and may set a particular delay value in this range to apply to the paths.

The SCC manager implements the Avalon-MM interface and the storage mechanism for all input, output, and phase settings. It contains circuitry that configures a DQ- or DQS-configuration block. The Nios II processor may set delay, phases, or register settings; the sequencer scans the settings serially to the appropriate DQ or DQS configuration block.

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