On-Die Termination Circuit Sequential Activation for Power Stability

The control circuit activates on-die termination circuits in advance but sequentially rather than simultaneously. The controller chip sends activation signals that trigger the termination circuits to become active before data transmission begins, but with staggered timing to avoid simultaneous activation. This preliminary activation ensures the termination circuits are ready to optimize waveform when needed, while the sequential timing prevents power supply instability and peak current issues.

The control circuit implements periodic or sequential activation of on-die termination circuits rather than continuous simultaneous activation. Each termination circuit is activated in turn based on timing signals from the control circuit, creating a periodic pattern of activation that maintains interface speed optimization while distributing current draw over time. This periodic action prevents dangerous peak current spikes that would occur with simultaneous activation.

The on-die termination circuits are designed to activate automatically in response to control signals without requiring complex external control logic. Each termination circuit contains its own control mechanism that responds to timing signals from the controller chip, enabling self-service operation. This approach maintains data exchange efficiency while avoiding the need for highly complex control circuits, as the termination circuits largely manage their own activation and operation.