Description

This section of the MIG Design Assistant focuses on the JEDEC Specification as it applies to the MIG 7 Series DDR3/DDR3L/DDR2 FPGA designs. Below you will find information related to your specific question.

NOTE: This answer record is part of the Xilinx MIG Solution Center (Xilinx Answer 34243). The Xilinx MIG Solution Center is available to address all questions related to MIG. Whether you are starting a new design with MIG or troubleshooting a problem, use the MIG Solution Center to guide you to the right information.

Solution

The MIG 7 Series DDR2/DDR3/DDR3L controller, upon reset, completes a JEDEC standard compliant initialization sequence. The simulation testbench skips the initial 200 s delay to speed up simulation times. In hardware, this requirement is observed. After initialization, the PHY logic completes the calibration process while adhering to all timing parameters and sending all required commands as defined by the JEDEC standards. Upon successfull calibration, the memory controller then ensures full JEDEC compliance.

The following links provide additional details regarding the MIG controller and various requirements of the JEDEC standards:

• (Xilinx Answer 47924) - DDR3 ZQ Calibration
• (Xilinx Answer 46082) - Dynamic ODT Special Use Case
• (Xilinx Answer 35094) - DDR3 Write Leveling
• (Xilinx Answer 34359) - DDR3 Multi-Purpose Register
• (Xilinx Answer 34370) - DDR3 Reset
• (Xilinx Answer 34371) - Auto Refresh Counter
• (Xilinx Answer 34396) - Self-Refresh
• (Xilinx Answer 45264) - Additive Latency

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