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    • 22. 发明申请
    • Double Data Rate Chaining for Synchronous DDR Interfaces
    • 双数据速率链接同步DDR接口
    • US20070300095A1
    • 2007-12-27
    • US11426651
    • 2006-06-27
    • Michael FeePatrick J. MeaneyChristopher J. BerryJonathan Y. ChenAlan P. Wagstaff
    • Michael FeePatrick J. MeaneyChristopher J. BerryJonathan Y. ChenAlan P. Wagstaff
    • G06F1/12
    • G06F13/4217
    • A system and method in which the receiving chip separately latches each half of the data received from the double data rate bus. Each half is launched as soon as it is available; one on the normal chip cycle time and the other is launched from a Master (L1) latch a half cycle into the normal chip cycle time. The first launched half of the data proceeds through the chip along its standard design chip path to be captured by the chips driving interface latch and launched again after one cycle of latency on the chip. The second half of the data proceeds through the chip one half cycle behind the first half, and is latched a half clock cycle later part way through the path into a Slave (L2) latch. On the next edge of the local clock, the data then continues from the L2 latch to the driving double data rate interface. This allows a half cycle set up time for the second half of the data so that it can be launched again, maintaining a one-cycle time on the chip.
    • 一种系统和方法,其中接收芯片分别锁存从双数据速率总线接收​​的数据的每一半。 每一半都可以立即启动; 一个在正常的芯片周期时间,另一个从主(L1)锁存器半个周期启动到正常的芯片周期时间。 首先推出的一半数据通过芯片沿其标准设计芯片路径进行,由芯片驱动接口锁存器捕获,并在芯片上的一个延迟周期后再次启动。 数据的后半部分通过芯片在上半部分后半个周期进行,并且稍后通过进入从(L2)锁存器的路径被锁存半个时钟周期。 在本地时钟的下一个边缘,数据然后从L2锁存器继续到驱动双数据速率接口。 这允许半周期的半周期设置时间,以便可以再次启动,在芯片上保持一个周期的时间。