Abstract:
A skew measure circuit (108), an exclusion circuit, and an up/down counter (116) are connected to form a skew detection circuit. The skew measure circuit (108) asserts a first output signal if a first input clock leads a second input clock, and asserts a second output signal if the second clock leads the first clock. The exclusion circuit (112) provides first and second digital pulse signals that represent the outputs of the skew measure circuit. The exclusion circuit also prevents the states of these pulse signals from changing, so long as the skew measure cicuit is experiencing metastability. The up/down counter's count is incremented in response to the first pulse signal and decremented in response to the other pulse signal.
Abstract:
On-die voltage and/or frequency detectors. For one aspect, an adaptive frequency clock generation circuit includes a droop detector to detect a supply voltage level and to cause the frequency of an on-die clock signal to be adjusted accordingly.
Abstract:
A skew measure circuit, an exclusion circuit, and an up/down counter are connected to form a skew detection circuit. The skew measure circuit asserts a first output signal if a first input clock leads a second input clock, and asserts a second output signal if the second clock leads the first clock. The exclusion circuit provides first and second digital pulse signals that represent the outputs of the skew measure circuit. The exclusion circuit also prevents the states of these pulse signals from changing, so long as the skew measure circuit is experiencing metastability. The up/down counter's count is incremented in response to the first pulse signal and decremented in response to the other pulse signal.