Xilinx offers a comprehensive set of solutions and collateral to help customers interface to QDRII and QDR II+ SRAMs.
UG586 - 7 Series FPGAs Memory Interface Solutions User Guide
The 7 Series FPGAs Memory Interface Solutions User Guide provides information about using, customizing, and simulating LogiCORE™ IP memory interface cores for the 7 Series FPGAs
UG406 - Virtex®-6 FPGA Memory Interface Solutions User Guide (PDF)
The Virtex-6 FPGA Memory Interface Solutions User Guide provides information about using, customizing, and simulating LogiCORE IP memory interface cores for the Virtex-6 FPGA.
XAPP853 - QDRII SRAM Interface for Virtex-5 FPGAs (PDF)
XAPP703 - QDRII SRAM Interface for Virtex-4 FPGAs (PDF)
Memory Interface Generator (MIG) - Generate your Virtex-6, Spartan®-6, Virtex-5, Virtex-4, and Spartan-3 generation memory interface reference designs, including HDL code and pin placements, using this user friendly tool.
Cypress Semiconductor QDRII SRAM Data Sheets