22.214.171.124. HPS SDRAM Controller Subsystem
The HPS SDRAM controller subsystem contains a multiport SDRAM controller and DDR PHY that are shared between the FPGA fabric (through the FPGA-to-HPS SDRAM interface), the level 2 (L2) cache, and the level 3 (L3) system interconnect. The FPGA-to-HPS SDRAM interface supports AMBA AXI and Avalon® Memory-Mapped ( Avalon® -MM) interface standards, and provides up to six individual ports for access by masters implemented in the FPGA fabric.
To maximize memory performance, the SDRAM controller subsystem supports command and data reordering, deficit round-robin arbitration with aging, and high-priority bypass features. The SDRAM controller subsystem supports DDR2, DDR3, or LPDDR2 devices up to 4 Gb in density operating at up to 533 MHz ( 1066 Mbps data rate).
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