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Atlas 200 Hardware Development Guide 02

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SD/eMMC Interface

SD/eMMC Interface

Table 4-3 PCB design requirements

Item

Design Requirement

Description

PCB routing impedance

40 ohm to 50 ohm.

-

Source end matching

22 ohm to 33 ohm.

The RX matches the TX source end. The resistance can be optimized based on the simulation and test results.

Routing length

< 5 inches.

> 5 inches (to be determined by simulation).

Reference plane

Ground plane, no cross-plane splits.

-

Timing Control

No strict timing control.

-

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Updated: 2019-07-29

Document ID: EDOC1100079542

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