Apparatuses and methods for determining a phase relationship between an input clock signal and a multiphase clock signal
View Patent ↗Apparatuses and methods for determining a phase relationship between an input clock signal and a multiphase clock signal are disclosed. An example apparatus includes a clock path configured to receive a clock signal and provide internal clock signals and a command path configured to receive a command and propagate the command through the command path responsive to the internal clock signals and provide an internal command having a timing that reflects a timing of the clock signal. The example apparatus further includes a data clock path configured to receive a data clock signal and provide multiphase clock signals based on the data clock signal and provide a delayed multiphase clock signal, and further includes a clock synchronization circuit configured to receive the delayed multiphase clock signal and latch a logic level of the delayed multiphase clock signal responsive to the internal command.
1. An apparatus, comprising:
a clock path configured to receive a clock signal and provide internal clock signals;
a command path configured to receive a command and propagate the command through the command path responsive to the internal clock signals and provide an internal command having a timing that reflects a timing of the clock signal;
a data clock path configured to receive a data clock signal and provide multiphase clock signals based on the data clock signal, the data clock path further configured to provide a delayed multiphase clock signal; and
a clock synchronization circuit configured to receive the delayed multiphase clock signal and latch a logic level of the delayed multiphase clock signal responsive to the internal command.
2. The apparatus of claim 1 wherein the data clock path includes a clock divider circuit configured to receive the data clock signal, wherein the multiphase clock signals have phases relative to one another.
3. The apparatus of claim 2 wherein the multiphase clock signals having phases relative to one another comprise quadrature phase clock signals.
4. The apparatus of claim 2 wherein the clock divider circuit is configured to provide the multiphase clock signals having a first phase relationship with the data clock signal or a second phase relationship with the data clock signal.
5. The apparatus of claim 4 wherein the logic level of the delayed multiphase clock signal is a first logic level for the first phase relationship and the logic level of the delayed multiphase clock signal is a second logic level for the second phase relationship.
6. The apparatus of claim 2 wherein the data clock path further includes a delay circuit configured to receive one of the multiphase clock signals and delay the one multiphase clock signal to provide the delayed multiphase clock signal.
7. The apparatus of claim 1 wherein the clock synchronization circuit comprises a flip-flop circuit configured to be clocked by the internal command to latch the logic level of the delayed multiphase clock signal.
8. The apparatus of claim 1 wherein the command path comprises:
flip-flop circuits configured to latch command signals responsive to the internal clock signal and provide the same; and
a command decoder coupled to the flip-flop circuits and configured decode the latched command signals and provide a decoded command signal, wherein the internal command is based on the decoded command signal.
9. The apparatus of claim 8 wherein the command path further comprises a command latency circuit coupled to the command decoder and configured to add delay to the decoded command signal, wherein the delay is defined by latency information and the decoded command signal is shifted through the command latency circuit responsive to delayed internal clock signals provided by the clock path.