Apparatus and method of compensating for phase delay in semiconductor device
View Patent ↗An apparatus for minimizing a skew occurring due to a change of data pattern by previously recognizing data pattern before data is outputted from the semiconductor device. The apparatus of compensating for a phase delay in a semiconductor device having a delay locked loop (DLL) for generating DLL clock includes: a data pattern detection block for detecting patterns of data loaded on data line and determining delay compensation amount of the data inputted to data output driver based on the detected data patterns; and a delay compensation block for compensating for phase delay of clock relating to the DLL clock inputted to the data output driver under a control of an output signal of the data pattern detection block.
1. An apparatus of compensating for a phase delay in a semiconductor memory device having a delay locked loop (DLL) for generating DLL clock, the semiconductor memory device comprising:
a data pattern detection block for detecting patterns of data loaded on a data line and determining a delay compensation amount of the data inputted to a data output driver based on the detected data patterns; and
a delay compensation block for compensating for phase delay of clock relating to the DLL clock inputted to the data output driver under a control of an output signal of the data pattern detection block.
2. The apparatus as recited in claim 1 , wherein the data pattern detection block includes:
a storage means for storing the delay compensation amount based on the data patterns; and
an interface means for connecting the storage means to peripheral circuits.
3. The apparatus as recited in claim 2 , wherein the storage means includes:
a decoder for decoding the data patterns; and
a storage device for receiving an output of the decoder and outputting the delay compensation amount required in the data pattern.
4. The apparatus as recited in claim 3 , wherein unit storage cell for delay compensation use within the storage device is controlled by the output of the decoder and outputs a first logic level in a turned-on state.
5. The apparatus as recited in claim 2 , wherein the interface means includes:
a front trigger unit for receiving data loaded on the data line;
an end trigger unit for processing an output of the storage means; and
a clock generator for generating a clock that controls the front trigger unit and the end trigger unit.
6. The apparatus as recited in claim 5 , wherein the front trigger unit includes individual front triggers, each individual front trigger including:
a first transmission gate for alternately transferring an odd data of the data line in response to edges of the clocks generated from the clock generator;
a second transmission gate for alternately transferring an even data of the data line in response to edges of the clocks generated from the clock generator; and
a latch for temporarily storing the odd and even data.
7. The apparatus as recited in claim 5 , wherein the end trigger unit includes individual end triggers, each individual end trigger including:
a transmission gate for transferring the delay compensation amount in response to the clocks outputted from the clock generator; and
a latch for temporarily storing an output of the transmission gate.
8. The apparatus as recited in claim 1 , wherein the delay compensation block controls a transmission speed of the data signal that is outputted to the data output driver in response to the output of the data pattern detection block.
9. The apparatus as recited in claim 1 , wherein the delay compensation block includes a driver for transferring the data signal and a current source transistor connected to the driver, the delay compensation block adjusting an amount of current transferred to the driver by controlling the size of the current source transistor in response to the output of the data pattern detection block.
10. A method of compensating for a phase delay in a semiconductor memory device having a delay locked loop (DLL) for generating DLL clock, the method comprising the steps of:
a) detecting patterns of data loaded on a data line and determining a delay compensation amount of the data inputted to a data output driver based on the detected data patterns; and
b) compensating for phase delay of clock relating to the DLL clock inputted to the data output driver based on the delay compensation amount.
11. The method as recited in claim 10 , wherein the step a) includes the steps of:
decoding the data pattern; and
outputting the delay compensation amount required in the data pattern.
12. The method as recited in claim 11 , wherein the step b) controls a transmission speed of the data signal outputted to the data output driver in response to the delay compensation amount.