Implementing High-Performance Memory Interfaces with Virtex-4 FPGAs
As designers of high-performance systems labor to achieve higher bandwidth while meeting critical timing margins, one consistently vexing performance bottleneck is the memory interface. Whether you are designing for an ASIC, ASSP, or FPGA, capturing source-synchronous read data at transfer rates exceeding 500 Mbps may well be the toughest challenge.
Double-data rate (DDR) SDRAM and quad-data-rate (QDR) SRAM memories utilize source-synchronous interfaces through which the data and clock (or strobe) are sent from the transmitter to the receiver. The clock is used within the receiver interface to latch the data. This eliminates interface control issues such as the time of signal flight between the memory and the FPGA, but raises new challenges that you must address.
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