External Memory Interface Handbook Volume 3: Reference Material

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

6.5.2. Single-Port Controller

The single-port logic is responsible for following actions:
  • Queuing the pending SDRAM bursts
  • Choosing the most efficient burst to send next
  • Keeping the SDRAM pipeline full
  • Ensuring all SDRAM timing parameters are met

Transactions passed to the single‑port logic for a single page in SDRAM are guaranteed to be executed in order, but transactions can be reordered between pages. Each SDRAM burst read or write is converted to the appropriate Altera PHY interface (AFI) command to open a bank on the correct row for the transaction (if required), execute the read or write command, and precharge the bank (if required).

The single‑port logic implements command reordering (looking ahead at the command sequence to see which banks can be put into the correct state to allow a read or write command to be executed) and data reordering (allowing data transactions to be dispatched even if the data transactions are executed in an order different than they were received from the multi-port logic).

The single-port controller consists of eight sub-modules.

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