Scannable sense amplifier circuit
First Claim
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1. An apparatus comprising:
- a plurality sense amplifiers, each of said sense amplifiers having a first and second internal node representing respectively, true and complement values of a latched value; and
a plurality of transfer circuits, one of said transfer circuits disposed between and coupled to each adjacent pair of said sense amplifiers, said transfer circuits transferring said true and complement values between a previous and a next sense amplifier;
whereinsaid sense amplifiers are alternately grouped as even sense amplifiers and odd sense amplifiers and are coupled to respective columns of a memory array and are coupled to form a scan chain via said transfer circuits, each of said odd sense amplifiers being coupled to latch a sensed value on assertion of a first clock signal and each of said even sense amplifiers being coupled to latch a sensed value on assertion of a second clocks signal; and
a first group of said transfer circuits are coupled to a first transfer signal and a second group of said transfer circuits are coupled to a second transfer signal, and wherein said first and second transfer signals are asserted to transfer data from said previous to said next sense amplifier in said scan chain, and said first and second clock signals are asserted to latch said transferred data into respective sense amplifiers.
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Abstract
A plurality sense amplifiers have first and second internal nodes representing respectively, true and complement values of a latched value. A plurality of transfer circuits are provided with one of the transfer circuits disposed between and coupled to each adjacent pairs of the sense amplifiers. The transfer circuits transfer true and complement values between a previous and a next sense amplifier, thereby providing a scannable sense amplifier.
384 Citations
17 Claims
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1. An apparatus comprising:
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a plurality sense amplifiers, each of said sense amplifiers having a first and second internal node representing respectively, true and complement values of a latched value; and a plurality of transfer circuits, one of said transfer circuits disposed between and coupled to each adjacent pair of said sense amplifiers, said transfer circuits transferring said true and complement values between a previous and a next sense amplifier;
whereinsaid sense amplifiers are alternately grouped as even sense amplifiers and odd sense amplifiers and are coupled to respective columns of a memory array and are coupled to form a scan chain via said transfer circuits, each of said odd sense amplifiers being coupled to latch a sensed value on assertion of a first clock signal and each of said even sense amplifiers being coupled to latch a sensed value on assertion of a second clocks signal; and a first group of said transfer circuits are coupled to a first transfer signal and a second group of said transfer circuits are coupled to a second transfer signal, and wherein said first and second transfer signals are asserted to transfer data from said previous to said next sense amplifier in said scan chain, and said first and second clock signals are asserted to latch said transferred data into respective sense amplifiers. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An apparatus comprising:
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a plurality sense amplifiers, each of said sense amplifiers having a first and second internal node representing respectively, true and complement values of a latched value; and a plurality of transfer circuits, one of said transfer circuits disposed between and coupled to each adjacent pair of said sense amplifiers, said transfer circuits transferring said true and complement values between a previous and a next sense amplifier; wherein each said sense amplifier comprises; a latching circuit, each latching circuit being coupled to one of said first and second clock signals; a first transistor having a first and second electrode, and a first gate electrode, said first electrode being coupled to a supply voltage; a second transistor having a third and fourth electrode and a second gate electrode, said third electrode being coupled to said supply voltage, said first and second gate electrodes being coupled respectively to first and second bit lines through isolation transistors, said first bit line representing a true value of a value stored said array and said second bit line representing a complement value of said value stored in said array, said second electrode of said first transistor being coupled to said second bit line at a first internal node in said sense amplifier, and said fourth electrode of said second transistor being coupled to said first bit line at a second internal node in said sense amplifier; a third transistor having a fifth and sixth electrode and a third gate electrode, said fifth electrode being coupled to said first internal node and said third gate electrode being coupled to said second internal node; a fourth transistor having a seventh and eighth electrodes and a fourth gate electrode, said seventh electrode being coupled to said second internal node and said fourth gate electrode being coupled to said first internal node; and
whereinsaid latching circuit comprises a fifth transistor having a ninth and a tenth electrode and a fifth gate electrode, said ninth electrode being coupled to said sixth and eighth electrodes and said tenth electrode being coupled to ground, and wherein said fifth gate electrode is coupled to one of said first and second clock signals. - View Dependent Claims (8, 9)
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10. An apparatus comprising:
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a plurality of transfer circuits; a plurality of sense amplifiers coupled to a storage array, each of said sense amplifiers being coupled to a next one of said sense amplifiers via one of said transfer circuits to form a scan chain, each of said sense amplifiers having a latching circuit, and wherein a first group of latching circuits in odd numbered sense amplifiers in said scan chain are coupled to a first clock signal and a second group of latching circuits in even numbered sense amplifiers in said scan chain are coupled to a second clock signal; a first transfer signal coupled to even numbered transfer circuits; and a second transfer signal coupled to odd numbered transfer circuits. - View Dependent Claims (11, 12, 13)
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14. A method of scanning a plurality of sense amplifiers of a memory array coupled in a scan chain, said plurality of sense amplifiers including a first group of sense amplifiers and a second group of sense amplifiers, each of said sense amplifiers being coupled to a next one of said sense amplifiers via a respective one of a plurality of transfer circuits, said transfer circuits including a first group and a second group, said method comprising:
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asserting a first transfer signal coupled to said first group of transfer circuits to provide a first group of signals respectively held in said first group of sense amplifiers to said second group of sense amplifiers; and asserting a second sense amplifier clock to store respective ones of said first group of signal values into said second group of sense amplifiers, thereby shifting said first group of signals from said first group of sense amplifiers to said second group of sense amplifiers. - View Dependent Claims (15, 16, 17)
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Specification