Method and apparatus for configuring a semiconductor device for compatibility with multiple logic interfaces
First Claim
1. A semiconductor device comprising:
- an interface control circuit for activating one of a plurality of interface enable signals responsive to at least one input signal for selecting an interface mode, and an address signal; and
an interface dependent circuit coupled to the interface control circuit for receiving the plurality of interface enable signals and operating in a selected interface mode responsive to the plurality of interface enable signals, whereby the semiconductor device is compatible with a plurality of system level interfaces.
1 Assignment
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Accused Products
Abstract
A semiconductor device can be configured for compatibility with different system level interfaces, e.g., LVTTL or SSTL, after assembly, thereby eliminating the need for bonding options and reducing the cost of manufacturing the device. The device includes an interface dependent circuit that operates with a selected interface in response to one or more interface enable signals. Several alternative embodiments include interface control circuits and mode register circuits for generating the interface enable signals responsive to a row address and control signals such as RAS, CAS, WE, and CS. Some embodiments also include a switching network that allows an input buffer to use an internally generated reference voltage for one interface and an externally applied reference voltage for a second interface.
20 Citations
29 Claims
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1. A semiconductor device comprising:
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an interface control circuit for activating one of a plurality of interface enable signals responsive to at least one input signal for selecting an interface mode, and an address signal; and an interface dependent circuit coupled to the interface control circuit for receiving the plurality of interface enable signals and operating in a selected interface mode responsive to the plurality of interface enable signals, whereby the semiconductor device is compatible with a plurality of system level interfaces.
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2. A semiconductor device comprising:
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an interface control circuit for activating one of a plurality of interface enable signals responsive to at least one input signal for selecting an interface mode; and an interface dependent circuit coupled to the interface control circuit for receiving the plurality of interface enable signals and operating in a selected interface mode responsive to the plurality of interface enable signals, whereby the semiconductor device is compatible with a plurality of system level interfaces; wherein the interface control circuit comprises; a register circuit for receiving a row address signal and generating an interface mode row address signal responsive to the row address signal and an interface selection mode signal; an interface selection mode signal generator coupled to the register circuit for generating the interface selection mode signal responsive to the at least one input signal for selecting an interface mode; and an interface enable signal generator coupled to the register circuit for decoding the interface mode row address signal and activating one of the plurality of interface enable signals. - View Dependent Claims (3, 4, 5, 6)
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7. A semiconductor device comprising:
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a mode register setting circuit for activating one of a plurality of interface enable signals responsive to an input address and a plurality of control signals; and an interface dependent circuit coupled to the mode register setting circuit for receiving the plurality of interface enable signals and operating in a selected interface mode responsive to the plurality of interface enable signals, whereby the semiconductor device is compatible with a plurality of system level interfaces.
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8. A semiconductor device comprising:
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a mode register setting circuit for activating one of a plurality of interface enable signals responsive to an input address and a plurality of control signals; and an interface dependent circuit coupled to the mode register setting circuit for receiving the plurality of interface enable signals and operating in a selected interface mode responsive to the plurality of interface enable signals, whereby the semiconductor device is compatible with a plurality of system level interfaces; wherein; the plurality of control signals includes a row address strobe signal, a column address strobe signal, a write enable signal, and chip selection signal; and the mode register setting circuit activates one of the plurality of interface enable signals when the control signals are all active.
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9. A semiconductor device comprising:
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a mode register setting circuit for activating one of a plurality of interface enable signals responsive to an input address and a plurality of control signals; and an interface dependent circuit coupled to the mode register setting circuit for receiving the plurality of interface enable signals and operating in a selected interface mode responsive to the plurality of interface enable signals, whereby the semiconductor device is compatible with a plurality of system level interfaces; wherein the mode register setting circuit comprises; a mode register for receiving and storing a row address signal and generating a mode row address signal responsive to an interface selection mode signal; and an interface enable signal generator coupled to the mode register for receiving and decoding the mode row address signal and activating one of the plurality of interface enable signals responsive to the mode row address signal. - View Dependent Claims (10, 11)
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12. A semiconductor device compatible with a first interface, the device comprising:
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an input buffer; a reference voltage generator; a pad for receiving a reference voltage; a control circuit for generating an interface enable signal; an interface dependent circuit coupled to the control circuit for operating with a second interface responsive to the interface enable signal; a first switch coupled between the reference voltage generator and the input buffer for transmitting the reference voltage from the reference voltage generator to the input buffer responsive to the interface enable signal; and a second switch coupled between the pad and the input buffer for transmitting the reference voltage from the pad to the input buffer responsive to the interface enable signal; whereby the semiconductor device can be configured to be compatible with the first and second interfaces responsive to interface selection information. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19)
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20. A semiconductor device compatible with a first interface, the device comprising:
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an input buffer; a reference voltage generator; a pad for receiving a reference voltage; a mode register setting circuit for activating an interface enable signal responsive to an input address and a plurality of control signals; an interface dependent circuit coupled to the mode register setting circuit for operating with a second interface responsive to the interface enable signal; a first switch coupled between the reference voltage generator and the input buffer for transmitting the reference voltage from the reference voltage generator to the input buffer responsive to the interface enable signal; and a second switch coupled between the pad and the input buffer for transmitting the reference voltage from the pad to the input buffer responsive to the interface enable signal; whereby the semiconductor device can be configured to be compatible with the first and second interfaces responsive to interface selection information. - View Dependent Claims (21, 22, 23, 24, 25)
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26. A method for driving a semiconductor device that is compatible with a plurality of interfaces, the method comprising:
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(a) setting the device in an interface selection mode; (b) activating one of a plurality of interface enable signals responsive to an interface selection mode signal and an address signal; and (c) setting the operation of an interface dependent circuit responsive to the active interface enable signal such that the interface dependent circuit operates with a selected interface.
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27. A method for driving a semiconductor device that is compatible with a plurality of interfaces, the method comprising:
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(a) activating a mode register setting circuit responsive to a plurality of control signals; (b) inputting a row address to the mode register setting circuit when the mode register setting circuit is activated; (c) setting an interface selection mode according to the row address; (d) activating one of a plurality of interface enable signals responsive to the row address; and (e) setting the operation of an interface dependent circuit responsive to the active interface enable signal such that the interface dependent circuit operates with a selected interface.
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28. A method for driving a semiconductor device that is compatible with a plurality of interfaces, the method comprising:
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(a) setting the device in an interface selection mode; (b) generating an interface enable signal; (c) setting the operation of an interface dependent circuit responsive to the interface enable signal such that the interface dependent circuit operates with a selected interface; (d) isolating a reference voltage generated inside the device from an input buffer; and (e) applying a reference voltage from outside of the device to the input buffer.
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29. A method for driving a semiconductor device that is compatible with a plurality of interfaces, the method comprising:
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(a) enabling a mode register setting circuit responsive to a plurality of control signals; (b) inputting a row address when the mode register setting circuit is activated; (c) setting an interface selection mode responsive to the row address; (d) generating an interface enable signal responsive to the row address; (e) setting the operation of an interface dependent circuit responsive to the interface enable signal such that the interface dependent circuit operates with a selected interface; (f) isolating a reference voltage generated inside the device from an input buffer; and (g) applying a reference voltage from outside of the device to the input buffer.
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Specification