External Memory Interfaces Intel® Agilex™ FPGA IP User Guide

ID 683216
Date 1/31/2022
Public

A newer version of this document is available. Customers should click here to go to the newest version.

Document Table of Contents

11.9.5.2.1. Address Generator Modes

Each of the six address generators can be configured to one of four modes.
  • Fixed: The address generator holds a constant value that is specified in the field’s corresponding TG_SEQ_START_ADDR_WR and TG_SEQ_START_ADDR_RD registers.
  • Random: The address generator starts at the value of the corresponding field’s TG_SEQ_START_ADDR_WR and TG_SEQ_START_ADDR_RD registers and generates a pseudorandom address for each instruction. (The pseudorandom address is generated by a Linear Feedback Shift Register (LFSR) and is guaranteed to not repeat for the entirety of the address generator width.)
  • Sequential: The address generator starts at the value of the corresponding field's TG_SEQ_START_ADDR_WR and TG_SEQ_START_ADDR_RD registers and increments by the value specified in the corresponding field’s TG_SEQ_ADDR_INCR register each instruction.
  • Unused: The address generator is deactivated and does not generate addresses. The address generator output is tied off to zero. Setting a field to this mode allows fewer than 6 address generators to be used.
Note: If a field is set to Random mode, the Start Address cannot be set to all 1s.