Semiconductor package on package memory channels with arbitration for shared calibration resources
US9269404B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Aug 7, 2014 |
| Grant date | Feb 23, 2016 |
| Priority date | — |
| Expiry date | Oct 18, 2034 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11C2207/2254
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A package on package (PoP) apparatus includes a shared ZQ calibration path and a shared ZQ calibration resistor for calibrating multiple channels of DRAM on a memory package of the PoP apparatus. Arbitration circuitry on a processor package of the PoP apparatus is coupled to separate memory controllers for the multiple memory channels. The arbitration circuitry is configured to indicate availability of the shared ZQ calibration resistor. The memory controllers are configured to communicate with the arbitration circuitry before performing a ZQ calibration and to delay the ZQ calibration when the arbitration circuitry indicates the ZQ calibration resistor is busy.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.