Figure 9-19 Analysis Of The U8815 Memory Interface; Table 9-3 Description Of The Signals In The Circuit Diagram In This Section - Huawei U8815 Maintenance Manual

U8815
Maintenance Manual

Figure 9-19 Analysis of the U8815 memory interface

The EMMC adopts 8-bit data cable for data transmission, and the U8815 adopts 4 GB
EMMC.
Troubleshooting Process
Failure: The handset cannot be powered on, or the power-on current is less than 100 mA.
Solution: Upgrade or reinstall the firmware of the handset, and check whether the
VREG_DCDC_2P85 voltage and peripheral components of the flash memory are normal. If
the problem persists, replace U1700.
Table 9-4 describes the signals in the circuit diagram in this section.
Table 9-4 Description of the signals in the circuit diagram in this section
Signal
SDC3_DATA3
SDC3_DATA2
SDC3_DATA1
SDC3_DATA0
SDC3_DATA7
SDC3_DATA6
SDC3_DATA5
SDC3_DATA4
SDC3_CLK
Issue 1.0 (2012-02-13)
Description
Data line
Data line
Data line
Data line
Data line
Data line
Data line
Data line
Clock
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9 Principles and Failure Analysis
Reference Measurement or Wave Form
36