| 摘要 |
The high speed greater than or equal to compare circuit comprises an equal to compare circuit having M number of exclusive-OR gates input into a NOR gate, each exclusive-OR gate N of the M number of exclusive-OR gates receiving as inputs a Nth bit of a first digital number having M bits and a corresponding Nth bit of a second digital number having M bits, wherein 1<N<M. Each exclusive-OR gate outputs a Nth not-equal signal indicating when the Nth bit of the first digital number is not equal to the corresponding Nth bit of the second digital number, whereby the output signal of the NOR gate indicates that the first digital number is equal to the second digital number. The circuit further comprises a greater than compare circuit including M number of NOR gates, each NOR gate N of the M NOR gates receives as inputs the complement of the Nth bit of the first digital number, a corresponding Nth bit of the second digital number, and each not-equal signal output from each exclusive-OR gate P, wherein N<P<M. The M NOR gates output a greater than signal indicating when the first digital number is greater than the second digital number. An output OR gate receives the NOR gate output signal from the equal to compare circuit and every greater than signal from the greater than compare circuit as inputs, and outputs a greater than or equal to signal indicating the first digital number is greater than or equal to the second digital number.
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