Eye-width detector, memory storage device and eye-width detection method of data signal

Patent metadata

Field	Value
Publication number	US-9836121-B2
Application number	US-201514856563-A
Country	US
Kind code	B2
Filing date	Sep 17, 2015
Priority date	Jul 28, 2015
Publication date	Dec 5, 2017
Grant date	Dec 5, 2017

Abstract

An eye-width detector, a memory storage device and an eye-width detection method of data signal are provided. The eye-width detector includes a phase interpolator, a calibration circuit and an eye-width detection circuit. The phase interpolator receives a first clock signal and a phase control signal and output a second clock signal. The calibration circuit receives the first clock signal and the second clock signal and output a first control signal. The eye-width detection circuit receive the data signal, the first clock signal and the second clock signal and generate a first sampling value and a second sampling value. If the first sampling value and the second sampling value do not match a first condition, the eye-width detection circuit outputs a second control signal; otherwise, outputs eye-width information of the data signal. Accordingly, the efficiency of the eye-width detection may be improved.

First claim

What is claimed is:

1. An eye-width detector, comprising:
a phase interpolator, configured to receive a first clock signal and a phase control signal and output a second clock signal;
a calibration circuit, coupled to the phase interpolator,
wherein the calibration circuit is configured to receive the first clock signal and the second clock signal and output a first control signal;
an eye-width detection circuit, coupled to the phase interpolator and the calibration circuit,
wherein the eye-width detection circuit is configured to receive a data signal, the first clock signal and the second clock signal and generate a first sampling value and a second sampling value,
wherein the eye-width detection circuit is further configured to output a second control signal if the first sampling value and the second sampling value do not match a first condition,
wherein the eye-width detection circuit is further configured to output eye-width information of the data signal if the first sampling value and the second sampling value match the first condition; and
a multiplexer, coupled to the phase interpolator, the calibration circuit and the eye-width detection circuit,
wherein the multiplexer is configured to receive the first control signal and the second control signal and output the phase control signal in response to a selection signal.

2. The eye-width detector according to claim 1 , wherein the calibration circuit comprises:
a calibration state machine, coupled to the multiplexer,
wherein the calibration state machine is configured to determine whether a clock frequency of the first clock signal is consistent with a clock frequency of the second clock signal and output the first control signal if the clock frequency of the first clock signal is inconsistent with the clock frequency of the second clock signal.

3. The eye-width detector according to claim 2 , wherein the calibration circuit further comprises:
a flip-flop circuit, coupled to the phase interpolator,
wherein the flip-flop circuit is configured to perform a sampling operation according to the first clock signal and the second clock signal;
a first latch circuit, coupled between the flip-flop circuit and the calibration state machine,
wherein the first latch circuit is configured to receive an output of the flip-flop circuit and output a first comparison signal,
wherein the calibration state machine determines whether the clock frequency of the first clock signal is consistent with the clock frequency of the second clock signal according to the first comparison signal.

4. The eye-width detector according to claim 2 , wherein the calibration state machine is further configured to output a first phase reference value corresponding to the second clock signal if the clock frequency of the first clock signal is consistent with the clock frequency of the second clock signal.

5. The eye-width detector according to claim 1 , wherein the eye-width detection circuit comprises:
an eye-width detection state machine, coupled to the calibration circuit,
wherein the eye-width detection state machine is configured to receive a first phase reference value from the calibration circuit and output a third control signal corresponding to the first phase reference value,
wherein the third control signal is configured to delay or accelerate the second clock signal by a default clock cycle,
wherein the multiplexer is further configured to receive the third control signal.

6. The eye-width detector according to claim 5 , wherein the eye-width detection state machine is further configured to determine whether the first sampling value and the second sampling value match the first condition in correspondence to the third control signal being outputted.

7. The eye-width detector according to claim 6 , wherein the eye-width detection state machine is further configured to obtain a second phase reference value of the second clock signal if the first sampling value and the second sampling value match the first condition,
wherein the eye-width detection circuit is further configured to output the eye-width information of the data signal according to the first phase reference value and the second phase reference value.

8. The eye-width detector according to claim 6 , wherein the eye-width detection state machine determines whether the first sampling value and the second sampling value are equal,
wherein the eye-width detection state machine determines that the first sampling value and the second sampling value do not match the first condition if the first sampling value and the second sampling value are not equal,
wherein the eye-width detection state machine determines that the first sampling value and the second sampling value match the first condition if the first sampling value and the second sampling value are equal.

9. The eye-width detector according to claim 8 , wherein the eye-width detection circuit further comprises:
an XOR circuit, coupled to the eye-width detection state machine,
wherein the XOR circuit is configured to perform an XOR operation according to the first sampling value and the second sampling value; and
a second latch circuit, coupled between the XOR circuit and the eye-width detection state machine,
wherein the second latch circuit is configured to receive an output of the XOR circuit and output a second comparison signal,
wherein the eye-width detection state machine determines whether the first sampling value and the second sampling value are equal according to the second comparison signal.

10. The eye-width detector according to claim 1 , wherein the eye-width detection circuit comprises:
a first sampling circuit, coupled to the phase interpolator and configured to sample the data signal by using the first clock signal in order to output the first sampling value; and
a second sampling circuit, coupled to the phase interpolator,
wherein the second sampling circuit is configured to sample the data signal by using the second clock signal and output the second sampling value.

11. The eye-width detector according to claim 1 , wherein the first clock signal is an output clock generated by a clock and data recovery circuit in correspondence to the data signal.

12. The eye-width detector according to claim 1 , wherein the second control signal is configured to reduce a time difference between a first time-point and a second time-point,
wherein the first time-point is a sampling time corresponding to the first sampling value,
wherein the second time-point is a sampling time corresponding to the second sampling value.

13. A memory storage device, comprising:
a connection interface unit, configured to couple to a host system;
a rewritable non-volatile memory module; and
a memory control circuit unit, coupled to the connection interface unit and the rewritable non-volatile memory module,
wherein the connection interface unit comprises an eye-width detector,
wherein the eye-width detector comprises:
a phase interpolator, configured to receive a first clock signal and a phase control signal and output a second clock signal;
a calibration circuit, coupled to the phase interpolator,
wherein the calibration circuit is configured to receive the first clock signal and the second clock signal and output a first control signal;
an eye-width detection circuit, coupled to the phase interpolator and the calibration circuit,
wherein the eye-width detection circuit is configured to receive a data signal, the first clock signal and the second clock signal and generate a first sampling value and a second sampling value,
wherein the eye-width detection circuit is further con

Assignees

• Phison Electronics Corp

Inventors

• Wu Jen-Chu
• Chen Wei-Yung
• Chen Yu-An

Classifications

• G06F3/013 Primary

  Eye tracking input arrangements (G06F3/015 takes precedence) · CPC title

• A61B3/11

  for measuring interpupillary distance or diameter of pupils · CPC title