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【应用手册】External Memory Interfaces in Stratix & Stratix GX Devices
Stratix® and Stratix GX devices support a broad range of external
memory interfaces such as double data rate (DDR) SDRAM, RLDRAM II,
quad data rate (QDR) SRAM, QDRII SRAM, zero bus turnaround (ZBT)
SRAM, and single data rate (SDR) SDRAM. The dedicated phase-shift
circuitry allows the Stratix and Stratix GX devices to interface at twice the
system clock speed with an external memory (up to 200 MHz/400 Mbps).
ch_8_vol_2(Replaces AN 212).pdf