In HPS, I connect an Avalon-mm-bridge host to f2h-Axi-slave, and export the slave of Avalon-mm bridge from the machine. Can I read and write DDR3 on the HPS side directly？
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It is recommended that you do all interconnect and bring it inside Platform Designer than exporting it out. If you are trying to access the DDR3 of the HPS , you will need a EMIF IP for the HPS and set the settings a per spec of your DDR connect it to the HPS.