The Memory Interface Configuration wizard allows you to create the IPs for the I/Os involved in the interface between a Xilinx® device and external memory. It provides a simplified method of filling in the memory interface I/Os in the XPE spreadsheet. When you configure a memory interface using the wizard, rows are added to the IP Manager sheet, and to the I/O sheet for each output line (for example, Data, Address, and Clock) from the Xilinx device that is applied to the external memory. The wizard also places rows on the Clock sheet, and on the Logic sheet. Resources are added representing typical usage to implement the physical controller and user interface layer.
The following fields are available in the XPE Memory Interface Configuration dialog box:
- The Memory Interface Configuration wizard supports the following I/O Memory
- Soft Memory Controllers
- DDR3, DDR3L, and LPDDR3
- QDRII+ and QDRIV
- Bank Type
- The appropriate bank type, where the choice exists between XP or HD I/O bank.
- Mem Config
- The appropriate memory configuration.
- Input Termination (DQ/S)
- Refers to the DQ (data) and DQS (data strobe) pins. For memory interfaces using the HD or XP banks, select RTT_40, RTT_48, RTT_60 or external termination (no entry).
- Data Rate
- The target data rate for your memory device.
- Address Width
- The total number of address lines used in the interface, which includes Row, Column, Bank, and, if used, Rank and CS lines.
- Data Width
- Select appropriate Data width for the selected memory interface.
- Read/Write (%)
- The percentage of the time the memory interface is used for reading from and writing to the external memory. The total must be less than or equal to 100% and the interface is assumed to be idle for 100% - (Read% + Write%) of the time. This is reflected in the Output Enable, Term Disable and IBUF Disable percentages.
- Number of Interfaces
- The number of memory interfaces that will use the settings that you are currently entering in the dialog box. When the I/O sheet is populated with the outputs to external memory, the number of pins for each type of line (for example, Address, Data, and Clock lines) will reflect the number of Interfaces you specify.
- Add typical link layer logic
- This option allows you to automatically generate the resources of the link layer logic for a specific memory interface. This is not applicable for Hard Memory Controllers.
- Module Name
- Allows you to assign a name to the generated configuration. This helps distinguish multiple configurations on the I/O sheet.
Once configured and created, new rows in the I/O sheet are populated with the information you entered in the dialog box.