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Current mode logic (CML), or source-coupled logic (SCL), is a digital design style used both for logic gates and for board-level digital signaling of digital data.. The basic principle of CML is that current from a constant current generator is steered between two alternate paths depending on whether a logic zero or logic one is being represented.
The physical layer for TMDS is current mode logic (CML), [2] DC coupled and terminated to 3.3 Volts. While the data is DC balanced (by the encoding algorithm), DC coupling is part of the specification. TMDS can be switched or repeated by any method applicable to CML signals.
Yourke's current switch was a differential amplifier whose input logic levels were different from the output logic levels. "In current mode operation, however, the output signal consists of voltage levels which vary about a reference level different from the input reference level."
The low common-mode voltage (the average of the voltages on the two wires) of about 1.2 V allows using LVDS with a wide range of integrated circuits with power supply voltages down to 2.5 V or lower. In addition, there are variations of LVDS that use a lower common mode voltage.
It does not use the term "Current Mode Logic." Furthermore, the diagram in Figure 4-1 shows the link with pull-ups only at the Receiver side; the transmitter can pull down each conductor through a current sink to ground. This diagram does not show pull-ups on the transmitter side.
The two logical states are usually represented by two different voltages, but two different currents are used in some logic signaling, like digital current loop interface and current-mode logic. High and low thresholds are specified for each logic family. When below the low threshold, the signal is low.
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In computer engineering, a logic family is one of two related concepts: A logic family of monolithic digital integrated circuit devices is a group of electronic logic gates constructed using one of several different designs, usually with compatible logic levels and power supply characteristics within a family. Many logic families were produced ...