Off-die termination module with a spring loaded pin in a DIMM socket

1. A method of off-die termination of memory module signal lines in a computer memory subsystem, the computer memory subsystem comprising a memory controller and a Dual In-Line Memory Module (‘DIMM’) socket, the memory controller electrically coupled to the DIMM socket via a memory module signal line, the method comprising:

receiving, by a spring loaded notch pin implemented as part of the DIMM socket responsive to removal of a DIMM from the DIMM socket, a reduction in pressure exerted on the spring loaded notch pin; and

responsive to the reduction in pressure, electrically coupling the memory module signal line to a ground reference voltage through an off-die termination component.

2. The method of claim 1 wherein the off-die termination component comprises part of the DIMM socket.

3. The method of claim 1 wherein the off-die termination component is implemented on the PCB.

4. The method of claim 1 wherein the spring loaded notch pin is located in a guide notch location of the DIMM socket.

5. The method of claim 1 wherein:

the off-die termination component comprises a termination resistor component; and

coupling the memory module signal line to an off-die termination component further comprises electrically coupling, by a spring of the spring loaded notch pin upon removal of a DIMM from the DIMM socket, the memory module signal line to the termination resistor component and a ground reference voltage.

6. The method of claim 5 wherein the termination resistor component comprises a programmable resistor network.

7. An off-die termination module for terminating memory module signal lines in a computer memory subsystem, the computer memory subsystem comprising a memory controller and a Dual In-Line Memory Module (‘DIMM’) socket installed on a printed circuit board (‘PCB’), the memory controller electrically coupled to the DIMM socket via a memory module signal line, the off-die termination module comprising:

an off-die termination component configured to terminate the memory module signal line upon activation; and

a spring loaded notch pin implemented as part of the DIMM socket, the spring loaded notch pin configured to toggle activation of the off-die termination component in dependence upon presence of a DIMM in the DIMM socket including activating the off-die termination component upon removal of a DIMM from the DIMM socket and deactivating the off-die termination component upon installation of a DIMM in the DIMM socket.

8. The method of claim 7 wherein the spring loaded notch pin is configured to toggle activation of the off-die termination component in dependence upon presence of a DIMM in the DIMM socket by, receiving, responsive to removal of a DIMM from the DIMM socket, a reduction in pressure exerted on the spring loaded notch pin and, responsive to the reduction in pressure, electrically coupling the memory module signal line to a ground reference voltage through the off-die termination component.

9. The off-die termination module of claim 7 wherein the off-die termination component comprises part of the DIMM socket.

10. The off-die termination module of claim 7 wherein the off-die termination component is implemented on the PCB.

11. The off-die termination module of claim 7 wherein the spring loaded notch pin is located in a guide notch location of the DIMM socket.

12. The off-die termination module of claim 7 wherein the off-die termination component comprises:

a termination resistor component, wherein a spring of the spring loaded notch pin is configured to electrically couple the memory module signal line to a ground reference voltage through the termination resistor component upon removal of a DIMM from the DIMM socket.

13. The off-die termination module of claim 12 wherein the termination resistor component comprises a programmable resistor network.

14. The off-die termination module of claim 12 wherein the termination resistor component comprises a variable resistor.

15. A computer memory subsystem including off-die termination of memory module signal lines, the computer memory subsystem comprising:

a memory controller; and

a Dual In-Line Memory Module (‘DIMM’) socket installed on a printed circuit board (‘PCB’), the DIMM socket electrically coupled to the memory controller via a memory module signal line; and

an off-die termination module comprising:

an off-die termination component configured to terminate the memory module signal line upon activation; and

a spring loaded notch pin implemented as part of the DIMM socket, the spring loaded notch pin configured to toggle activation of the off-die termination component in dependence upon presence of a DIMM in the DIMM socket including activating the off-die termination component upon removal of a DIMM from the DIMM socket and deactivating the off-die termination component upon installation of a DIMM in the DIMM socket.

16. The computer memory subsystem of claim 15 wherein the spring loaded notch pin is configured to toggle activation of the off-die termination component in dependence upon presence of a DIMM in the DIMM socket by, receiving, responsive to removal of a DIMM from the DIMM socket, a reduction in pressure exerted on the spring loaded notch pin and, responsive to the reduction in pressure, electrically coupling the memory module signal line to a ground reference voltage through the off-die termination component.

17. The computer memory subsystem of claim 15 wherein the off-die termination component comprises part of the DIMM socket.

18. The computer memory subsystem of claim 15 wherein the off-die termination component is implemented on the PCB.

19. The computer memory subsystem of claim 15 wherein the spring loaded notch pin is located in a guide notch location of the DIMM socket.

20. The computer memory subsystem of claim 15 wherein the off-die termination component further comprises:

a termination resistor component, wherein a spring of the spring loaded notch pin is configured to electrically couple the memory module signal line to a ground reference voltage through the termination resistor component upon removal of a DIMM from the DIMM socket.