Mixed-mode signaling
First Claim
1. An apparatus comprising:
- a first circuit of a first die comprising;
a first transmitter configured to transmit a differential signal through a pair of electrically conductive lines in a first direction, the differential signal having a first frequency; and
a second transmitter configured to transmit a common mode signal through the pair of electrically conductive lines in the first direction such that the common mode signal is superimposed on the differential signal, wherein the common mode signal has a second frequency that is lower than the first frequency; and
a second circuit of a second die configured to receive the differential signal and the common mode signal over a channel, wherein the second die is stacked over the first die, wherein the channel extends between the first circuit and the second circuit.
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Accused Products
Abstract
Methods and apparatus are disclosed, such as those involving mixed-mode signaling that includes transmitting a differential signal and a common mode signals over the same pair of interconnect traces. One such apparatus includes a first transmitter configured to transmit a differential signal through a pair of electrically conductive lines in a first direction. The differential signal has a first frequency and carries electronic data. The apparatus further includes a second transmitter configured to transmit a common mode signal through the pair of electrically conductive lines in the first direction. The common mode signal is superimposed onto each of the differential signal. The common mode signal has a second frequency that is lower than the first frequency and carries a control signal. This configuration reduces the number of lines and pins on electronic circuits, thereby saving space thereon.
37 Citations
30 Claims
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1. An apparatus comprising:
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a first circuit of a first die comprising; a first transmitter configured to transmit a differential signal through a pair of electrically conductive lines in a first direction, the differential signal having a first frequency; and a second transmitter configured to transmit a common mode signal through the pair of electrically conductive lines in the first direction such that the common mode signal is superimposed on the differential signal, wherein the common mode signal has a second frequency that is lower than the first frequency; and a second circuit of a second die configured to receive the differential signal and the common mode signal over a channel, wherein the second die is stacked over the first die, wherein the channel extends between the first circuit and the second circuit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 30)
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13. An apparatus comprising:
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a first circuit of a first die configured to receive a differential signal transmitted over a pair of electrically conductive lines in a direction, the differential signal having a first frequency; and a second circuit of a second die configured to receive a common mode signal transmitted over the pair of electrically conductive lines in the direction via a channel, wherein the common mode signal is superimposed on the differential signal, wherein the common mode signal has a second frequency that is lower than the first frequency, wherein the second die is stacked over the first die, wherein the channel extends between the first circuit and the second circuit. - View Dependent Claims (14, 15, 16)
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17. A system comprising:
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a channel comprising a pair of electrically conductive lines; a first circuit comprising; a first transmitter configured to transmit a differential signal through the pair of electrically conductive lines, wherein the differential signal carries data; and a second transmitter configured to transmit a common mode signal through the pair of electrically conductive lines simultaneously with the differential signal, wherein the common mode signal carries a control signal; and a second circuit configured to receive the differential signal and the common mode signal over the channel; wherein the system comprises a first die comprising the first circuit, and a second die comprising the second circuit, the second die being stacked over the first die, and wherein the channel extends between the first and second circuits. - View Dependent Claims (18, 19, 20, 22, 23, 24)
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21. A system comprising:
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a channel comprising a pair of electrically conductive lines; a first die comprising a first circuit, the first circuit comprising; a first transmitter configured to transmit a differential signal through the pair of electrically conductive lines, wherein the differential signal carries data; and a second transmitter configured to transmit a common mode signal through the pair of electrically conductive lines simultaneously with the differential signal, wherein the common mode signal carries a control signal; and a second die stacked over the first die, the second die comprising a second circuit, the second circuit configured to receive the differential signal and the common mode signal over the channel, wherein the channel extends between the first circuit and the second circuit, the second circuit comprising; a third transmitter configured to transmit a second differential signal through the pair of electrically conductive lines, wherein the second differential signal carries data; and a fourth transmitter configured to transmit a second common mode signal through the pair of electrically conductive lines simultaneously with the second differential signal, wherein the second common mode signal carries a control signal; and wherein the first circuit is further configured to receive the second differential signal and the second common mode signal over the channel.
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25. A method of transmitting, the method comprising:
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transmitting a differential signal having a first frequency in a first direction over a pair of electrically conductive lines; and transmitting a common mode signal having a second frequency in the first direction over the pair of electrically conductive lines, simultaneously with the differential signal, wherein the second frequency is lower than the first frequency; wherein the differential signal and the common mode signal are transmitted from a first die to a second die, wherein the second die is stacked over the first die. - View Dependent Claims (26, 27, 28, 29)
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Specification