Invention Grant
US07660187B2 Method and apparatus for initialization of read latency tracking circuit in high-speed DRAM 有权
用于在高速DRAM中初始化读延迟跟踪电路的方法和装置

Method and apparatus for initialization of read latency tracking circuit in high-speed DRAM
Abstract:
A method of controlling the output of data from a memory device includes deriving from an external clock signal a read clock and a control clock for operating an array of storage cells, both the read clock and the control clock each being comprised of clock pulses. A value is preloaded into one or both of a first counter located in the read clock domain and a second counter located in the control clock domain such that the difference in starting counts between the two counters is equal to a column address strobe latency (L) minus a synchronization (SP) overhead. A start signal is generated for initiating production of a running count of the read clock pulses in the first counter. The input of the start signal to the second counter is delayed so as to delay the initiation of a running count of the control clock pulses. A value of the second counter is held in response to a read command. The held value of the second counter is compared to a running count of the first counter; and data is output from the memory device with the read clock signal in response to the comparing.
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