Installation Instructions
Table Of Contents
- Contents
- List of Table
- List of Figures
- 1 About this document
- 2 Product Overview
- 3 Mechanical Dimensions
- 4 Interface description
- 4.1 Pin Definition
- 4.2 Operating conditions
- 4.3 Digital logic characteristics
- 4.4 Power interface
- 4.5 USIM card interface
- 4.6 PCM interface
- 4.7 USB2.0 interface
- 4.8 UART interface
- 4.9 SPI interface
- 4.10 I2C interface
- 4.11 Network light
- 4.12 System Status Indication
- 4.13 Flight Mode
- 4.14 Forced USB download interface
- 4.15 SD card interface
- 4.16 SDIO_WIFI/EMMC interface
- 4.17 PCIe interface
- 4.18 RMII/RGMII interface
- 4.19 AUDIO interface
- 4.20 ADC
- 4.21 GPIOs
- 4.22 Power on/off and reset interface
- 4.23 Antenna interface
- 5 Product characteristics
- 6 Design Guideline
- 7 Storage, Production and Package
- 8 Safety Information
- 空白页面
- 空白页面
L508 Hardware Design
Copyright© Shanghai Mobiletek Communication Ltd 57
21 MMC_CMD DO Secure digital controller 1 command
22 MMC_DATA0 B Secure digital controller 1 data bit 0
23 MMC_DATA1 B Secure digital controller 1 data bit 1
24 MMC_DATA2 B Secure digital controller 1 data bit 2
25 MMC_DATA3 B Secure digital controller 1 data bit 3
26 MMC_CLK DO Secure digital controller 1 clock
44 SD_LDO PO
LDO output for SD card power, default voltage is
3.0V
48 MMC_CD DI Secure digital card detection
4.15.2 SD card reference design
CMD, CLK, DATA0, DATA1, DATA2 and DATA3 are all high-speed signal lines. During PCB design,
these signals need to be controlled by 50ohm impedance, and do not cross with other routes. The
routes should be placed in the inner layer as far as possible. CLK, CMD, DATA0, DATA1, DATA2,
DATA3 line equal length processing; CLK needs to be packaged separately.
MMC _DATA1
MMC _DATA0
MMC_DATA3
MMC_DATA2
MMC _CMD
MODULE
D2
C1
C2
4.7UF
100NF
D4 D5
DAT2
CD/ DAT3
CMD
VDD
CLK
VSS
DAT0
DAT1
DET
GND
GND
GND
GND
SD_LDO
MMC _CLK
MMC_CD
SD
D1
D3
D6 D7 D8