| 摘要 |
A method and apparatus for determining the characteristics of a communications channel within a high speed memory system includes generating a first signal having a known and repeating pattern and generating a second signal having a pseudo-random pattern. The first and second signals are combined to produce a combined signal. The "combining" may be a type of encoding or scrambling, such as results from inputting the first and second signals into an exclusive OR gate. The combined signal is transmitted over a communications channel of a memory system. The combined signal is received by the memory devices of the memory system. Each memory device removes the second signal from the received combined signal to produce a received first signal. The "removing" may be a type of decoding or descrambling, such as results from inputting a third signal having the same pseudo-random pattern as the second signal (i.e., a copy of the second signal) and the received combined signal into an exclusive OR gate. Parameters associated with transmitting and receiving may be adjusted by examining the pattern of the received first signal to determine if it has the known pattern of the first signal. More specifically, timing and or voltage verniers may be adjusted to successfully detect the combined signal transmitted over the communication channel and to initialize the transmitting and receiving for maximum communications channel fidelity. Because of the rules governing abstracts, this abstract should not be used to construe the claims.
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