| 摘要 |
Each symbol in a sequence of codewords is expressed as a voltage level representative of a one or zero, and each codeword includes both levels. Sense amplifiers at the receiver compare all pairs of symbols in each codeword. Comparisons based upon like symbol values provide mid-range sensed voltages, and comparisons based upon disparate symbols values provide relatively higher or lower sensed voltages. Sampling the high and low voltages produces determinate sample values, whereas sampling the midrange voltage produces indeterminate sample values. Sampling the sensed voltages thus produces a mix of indeterminate and determinate values for each codeword. Codewords are selected such that the number and placement of the determinate sample values identify each codeword, and subsequent codewords are selected so the nodes supporting the high and low sensed voltages sampled to obtain the determinate sample values transitioned to their current voltage from either the intermediate voltage or did not transition.
|
