EWM103-WF7621A User Manual

1.1 Product Introduction

A Gigabit routing gateway module developed by Chengdu Ebyte Electronic Technology Co., Ltd. with MediaTek MT7621A chip as the core. The module integrates dual-core MIPS-1004Kc (880MHz), HNAT/HQoS/Samba/VPN accelerator and 5-port GbE switch, supports OpenWrt operating system and custom development, has rich interfaces and powerful processors, can be widely used in smart devices or cloud service applications, and can be freely developed for secondary development.

Figure 1: EWM103-WF7621A

A visual representation of the EWM103-WF7621A module, showing its dimensions and key components. The module is approximately 50.0±0.2mm in both length and width.

1.2 Features

• Embedded MIPS1004Kc (880 MHz, dual-core)
• 32 KB I-Cache and 32 KB D-Cache per core
• 256kb L2 cache (shared by two cores)
• SMP Function
• Configurable single processor operation
• Gigabit Switch: 5 ports, running at full line speed
• 5-port 10/100/1000Mbps MDI transceiver
• Support RGMII/MII interface
• 16-bit DDR2/3, capacity up to 256/512 Mbytes
• SPI (2 chip select), NAND Flash (SLC), SDXC, eMMC (4 bits)
• USB3.0 interface × 1 + USB2.0 interface × 1 or USB2.0 interface × 2 (both are host interfaces)
• PCIe host interface × 3
• I2C, UART Lite × 3, JTAG, MDC, MDIO, GPIO
• Support Internet voice calls (I2S, PCM)
• Audio interface (SPDIF-Tx, I2S, PCM)
• Provides excellent Samba performance via USB2.0/USB 3.0/SD-XC
• HW Storage Accelerator
• HW NAT
• Wired transmission rate up to 2Gbps
• L2 Bridge
• IPv4 routing, NAT, NAPT
• IPv6 routing, DS-Lite, 6RD, 6to4
• HW QoS: 16 hardware queues to guarantee the minimum/maximum bandwidth for each flow. Can work seamlessly with HW NAT engine. Wired transmission rate can reach 2Gbps.
• HW Encryption: IPSec throughput can reach 400~500mbps
• Green: Smart clock adjustment (dedicated), DDR2/3: ODT off, self-refresh mode
• Firmware: OpenWRT
• RGMII INIC Driver: Linux 2.4/2.6

1.3 Application Scenarios

• Wifi video transmission
• WiFi audio transmission
• Router
• Wifi repeater
• Serial port forwarding and other general-purpose modules for smart homes
• Cloud Service Application
• IoT Gateway

2.1 Basic parameters

2.2 Hardware Parameters

2.3 Functional Block Diagram

A block diagram illustrating the internal architecture of the EWM103-WF7621A module. It shows the MIPS 1004Kc cores, cache, crypto, storage accelerator, Gigabit Switch, and various interfaces like WiFi, PCIe, USB, UART, SPI, I2C, and audio interfaces.

5.1 The transmission distance is not ideal

• When there is a straight-line communication obstacle, the communication distance will be attenuated accordingly.
• Temperature, humidity, and co-channel interference can increase the communication packet loss rate.
• The ground absorbs and reflects radio waves, so the test results are poor when close to the ground.
• Seawater has a strong ability to absorb radio waves, so the test effect at the seaside is poor.
• If there are metal objects near the antenna, or the antenna is placed in a metal shell, the signal attenuation will be very serious.
• The power register is set incorrectly, or the air rate is set too high (the higher the air rate, the closer the distance).
• The power supply voltage is lower than the recommended value at room temperature. The lower the voltage, the lower the power output.
• This causes poor matching between the antenna and the module or quality issues with the antenna itself.

5.2 Modules are vulnerable to damage

• Please check the power supply to ensure that it is within the recommended power supply voltage. If it exceeds the maximum value, the module will be permanently damaged.
• Please check the stability of the power supply. The voltage should not fluctuate greatly or frequently.
• Please ensure anti-static operation during installation and use, as high-frequency components are sensitive to static electricity.
• Please ensure that the humidity is not too high during installation and use, as some components are humidity sensitive devices.
• If there is no special requirement, it is not recommended to use it at too high or too low temperature.

6.1 Reflow temperature

A table detailing reflow profile characteristics for both leaded and lead-free assembly processes, including minimum and maximum temperatures, heating slopes, liquidus temperature, and peak temperature tolerances.

Note: The peak temperature (Tp) tolerance of the temperature curve is defined as the upper limit of the user.

6.2 Reflow Oven Curve

A graph illustrating the temperature profile for reflow soldering. It shows different zones such as preheating, soaking, and reflow, with temperature and time axes. Key points like Tsmin, Tsmax, TL, and Tp are indicated, along with maximum warming and cooling slopes.