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U4164A Datasheet(PDF) 8 Page - Keysight Technologies |
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U4164A Datasheet(HTML) 8 Page - Keysight Technologies |
8 / 34 page 08 | Keysight | U4164A Logic Analyzer Module - Data Sheet State mode support for bursty clock inputs allows you to take measurements that include periods of in activity on the clock, such as power management transitions when the clock is inactive. In state mode, the U4164A allows one clock input into pod 1 of the clocking module. – Double module set - bottom module of set is clocking module – Three card set - middle module is clocking module There are five clock qualifiers available on the clocking module. The clock inputs to pods 2, 3, 4, and 5 can be used as “AND” or “OR” clock qualifiers. The “RESET” clock qualifier input on pod 7 is available as an “AND” input only when the other clock qualifiers are setup as “OR” inputs. The most common use mode for this clock qualifier is to capture “RESET” when the other clock qualifiers are looking for clock enable (CKE) signals on DDR and LPDDR buses. Clock hysteresis The U4164A module has a unique clock hysteresis feature that allows the user to define a range about the clock threshold. Using clock hysteresis enables the U4164A clock input in state mode to avoid false sampling on noisy clock inputs that may float to zero volts at the differential clock input to the U4164A when the clock is turned off. Clock hysteresis improves state mode captures from systems where a differential clock input turns off and floats to zero volts. Clock hysteresis control is inside the threshold dialog for the clock. The “hysteresis on” check box [x] is an on/off control. There is also an input for the amount of hysteresis setting in millivolts around threshold between 0 and 1 volts. State Mode Clock Inputs and Clock Qualifiers Figure 2. Clock hysteresis selection and setting in clock thresholds window. The settings shown were used to capture an LPDDR4 system initializing without the use of any clock qualifiers. |
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