利用数控阻抗:信号完整性和功耗的考虑 Application Note: Virtex-5, Virtex-4, and Spartan-3 Generation Devices R Using Digitally Controlled Impedance: Signal Integrity vs. Power Dissipation XAPP863 (v1.0) June 1, 2007 Considerations Author: David Banas Summary On-die termination (ODT) promises higher signaling rates for printed circuit board (PCB) inter- chip interfaces through improved signal integr……