External Memory Interfaces Intel® Agilex™ FPGA IP User Guide

ID 683216
Date 3/28/2022

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Document Table of Contents Command and Address Signals

Command and address signals in SDRAM devices are clocked into the memory device using the CK or CK# signal. These pins operate at single data rate (SDR) using only one clock edge. The number of address pins depends on the SDRAM device capacity. The address pins are multiplexed, so two clock cycles are required to send the row, column, and bank address.

Although DDR4 operates in fundamentally the same way as other SDRAM, there are no dedicated pins for RAS#, CAS#, and WE#, as those are shared with higher-order address pins. DDR4 has CS#, CKE, ODT, and RESET# pins, similar to DDR3. DDR4 also has some additional pins, including the ACT# (activate) pin and BG (bank group) pins.

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