Interview Question

GPU Product Architect Interview Santa Clara, CA

Describe why termination is needed for CML signals


Interview Answer

2 Answers


A termination resistor is required to complete the circuit

Interview Candidate on Apr 27, 2012

Current mode logic (CML), or source-coupled logic (SCL), is a differential digital logic family intended to transmit data at speeds between 312.5 Mbit/s and 3.125 Gbit/s over a standard printed circuit board.
The transmission is point-to-point, unidirectional and is usually terminated at the destination with 50 ? resistors to Vcc on both differential lines. CML is the physical layer used in DVI and HDMI video links, and is frequently used in interfaces to fiber optic components.

IK on Aug 8, 2012

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