AMD GX1 ADL Stability free download

File name GX1_ADL_Stability.pdf

AMD GeodeTM GX1 Processor ADL Stability Issue at 333 MHz 1.0 Scope Customers have reported a system stability issue with the 2.2 System Board Core Voltage Noise GeodeTM GX1 processor at 333 MHz. AMD has deter- Mitigation mined that the problem is excessive core voltage noise, which creates instability in the internal core clock genera- AMD uses the Geode SP4GX10 development/validation tor. AMD has further determined that it is difficult to design platform to perform stress and stability testing on the 333 a low noise circuit board using standard engineering prac- MHz SKU. Because this platform was designed for a PGA tices. package, AMD designed an interposer board that has a PBGA footprint to mount the EBGA package. This inter- This technical bulletin describes the issue and what mea- poser has two ground planes, a 3.3V plane, a core voltage sures can be taken to mitigate core voltage noise and addi- plane, and two signal layers. It has four 220