Trace length on printed circuit board (pcb) based on input/output (i/o) operating speed
AssigneeQUALCOMM Incorporated
InventorsSunil GUPTA, Scott POWERS
Life of this patent
Estimating the term…
Abstract
A wireline communications system is described. The wireline communications system includes a printed circuit board (PCB). The wireline communications system also includes a system on chip (SoC) die on the PCB. The wireline communications system further includes an external memory device coupled to a memory interface of the SoC die. The external memory device is coupled to the memory interface of the SoC die through a PCB trace. A length of the PCB trace is configured according to an operating speed of the memory interface.
Claims20
A wireline communications system, comprising:
- a printed circuit board (PCB);
- a system on chip (SoC) die on the PCB;
- and
- an external memory device coupled to a memory interface of the SoC die through a PCB trace, in which a length of the PCB trace is configured according to an operating speed of the memory interface.
A method for determining an improved printed circuit board (PCB) trace length of a wireline communications system, comprising:
- determining a signal propagation length covered in a predetermined time duration based on an input/output operation speed of a memory interface;
- determining a signal speed according to a material of a printed circuit board (PCB) or a package material;
- computing a total trace length according to the signal speed and the signal propagation length;
- and
- determining the improved PCB trace length based on the total trace length minus an SoC package trace length and a memory package trace length.
A wireline communications system, comprising:
- a printed circuit board (PCB);
- a system on chip (SoC) die on the PCB;
- and
- an external memory device coupled to a memory interface of the SoC die through a signal integrity channel, in which a length of the signal integrity channel is configured according to an operating speed of the memory interface.
Dependencies are inferred from the claim text.