Apparatus and methods for improved input/output cells
First Claim
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1. An I/O cell, comprising:
- a bidirectional signal pad configured for transferring a first signal to a device coupled thereto and for receiving a second signal from the device;
a duty cycle controller coupled to the signal pad and configured for balancing a duty cycle of the first signal with respect to a clock signal; and
dynamic switchable termination coupled to the signal pad and configured for providing termination impedance when the I/O cell is receiving the second data signal.
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Abstract
Apparatus and methods are provided for improving data exchanges between electronic devices, such as memory controllers and RLDRAMs. An I/O cell includes a signal pad for transferring a first signal to an electronic device coupled thereto and for receiving a second signal from the electronic device. In one aspect, a duty cycle controller is coupled to the signal pad for balancing a duty cycle of the first signal with respect to a clock signal. In another aspect, dynamic switchable termination is coupled to the signal pad for providing termination impedance when the I/O cell is receiving the second signal.
27 Citations
20 Claims
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1. An I/O cell, comprising:
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a bidirectional signal pad configured for transferring a first signal to a device coupled thereto and for receiving a second signal from the device;
a duty cycle controller coupled to the signal pad and configured for balancing a duty cycle of the first signal with respect to a clock signal; and
dynamic switchable termination coupled to the signal pad and configured for providing termination impedance when the I/O cell is receiving the second data signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An I/O device, comprising:
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an output signal pad configured for transferring a data signal to another device coupled thereto;
an output driver comprising a first transistor and a second transistor for providing the data signal to the output signal pad; and
a duty cycle controller comprising a first logic circuit coupled to a gate of the first transistor and a second logic circuit coupled to a gate of the second transistor, wherein the duty cycle controller is configured for balancing a duty cycle of the data signal with respect to a clock signal. - View Dependent Claims (10, 11, 12, 13)
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14. An I/O cell, comprising:
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an input signal pad configured for receiving a signal from the device; and
dynamic switchable termination coupled to the input signal pad and configured for providing termination impedance when the I/O cell is receiving the signal, wherein the termination impedance comprises process, voltage, and temperature compensated resistance. - View Dependent Claims (15, 16)
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17. A method for transceiving data, comprising:
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transferring a first data signal to an externally coupled device comprising balancing a duty cycle of a first data signal of the data with respect to a clock signal; and
receiving a second data signal of the data from the externally coupled device responsive to transferring and comprising dynamically applying termination impedance to the second data signal. - View Dependent Claims (18, 19, 20)
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Specification