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AMD-762 Datasheet(PDF) 21 Page - Advanced Micro Devices |
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AMD-762 Datasheet(HTML) 21 Page - Advanced Micro Devices |
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21 / 122 page  Chapter 2 Functional Operation 9 24416C—December 2001 AMD-762™ System Controller Data Sheet Preliminary Information Figure 3. Push-Pull Transmission Line Example The dynamic compensation scheme implements a dummy driver with characteristics exactly matching the normal driver. An external precision resistor is attached, and the voltage of the resulting voltage divider is compared to VTT/2. The drive strength is then adjusted until a voltage near VTT/2 is achieved. The output impedance then roughly matches the resistor value. Separa te compensation is perform e d fo r the N and P transistors. The drive strength is changed in small steps when no data is being driven. Refer to Figure 4. Figure 4. Dummy Load with External Compensation Resistors OUT Receiver Transmission Line Part of Output Transistors VTT/2 + - Many Segments VTT INP INN Driver VTT INP INN Dummy Driver VTT/2 50 Ohms + 1% 50 Ohms + 1% + - |
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