EBYTE MT7621A Wireless Module User Manual

The EWM103-WF7621A is a Gigabit routing gateway module developed
by Chengdu Ebyte Electronic Technology Co., Ltd. It features the
MediaTek MT7621A chip as its core, with a dual-core MIPS-1004Kc
processor running at 880MHz. The module integrates various
accelerators and a 5-port GbE switch, supporting the OpenWrt
operating system for custom development. It is suitable for smart
devices, cloud service applications, and secondary development.

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

Product Usage Instructions

6. Welding Operation Instructions

6.1 Reflow Temperature

Follow the recommended reflow temperature specified in the
product datasheet to ensure proper soldering of the module.

6.2 Reflow Oven Curve

Refer to the reflow oven curve provided in the product
documentation for the correct temperature profile during the
soldering process.

Frequently Asked Questions (FAQ)

5.1 The Transmission Distance is Not Ideal

If you are experiencing issues with the transmission distance,
ensure that there are no obstructions between the wireless module
and the connected devices. Additionally, check for interference
from other electronic devices.

5.2 Modules Are Vulnerable to Damage

To prevent damage to the modules, handle them with care during
installation and avoid exposing them to excessive heat or moisture.
Follow proper ESD precautions when working with electronic
components.

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EWM103-WF7621A User Manual
MT7621A wireless module

Chengdu Ebyte Electronic Technology Co., Ltd.

EWM103-WF7621A User Manual

Contents

MT7621A WIRELESS MODULE ……………………………………………………………………………………………..0

DISCLAIMER ………………………………………………………………………………………………………………………….. 2

1 PRODUCT OVERVIEW ……………………………………………………………………………………………………….. 1
1.1 PRODUCT INTRODUCTION ……………………………………………………………………………………………………………………………………………….. 1 1.2 FEATURES ………………………………………………………………………………………………………………………………………………………………… 1 1.3 APPLICATION SCENARIOS ………………………………………………………………………………………………………………………………………………… 2
2 SPECIFICATIONS ………………………………………………………………………………………………………………… 3
2.1 BASIC PARAMETERS………………………………………………………………………………………………………………………………………………………….3 2.2 HARDWARE PARAMETERS ……………………………………………………………………………………………………………………………………………….. 3 2.3 FUNCTIONAL BLOCK DIAGRAM ……………………………………………………………………………………………………………………………………… 4
5 FREQUENTLY ASKED QUESTIONS …………………………………………………………………………………..9
5.1 THE TRANSMISSION DISTANCE IS NOT IDEAL …………………………………………………………………………………………………………………..9 5.2 MODULES ARE VULNERABLE TO DAMAGE ………………………………………………………………………………………………………………………9
6 WELDING OPERATION INSTRUCTIONS ………………………………………………………………………. 10
6.1 REFLOW TEMPERATURE………………………………………………………………………………………………………………………………………………….10 6.2 REFLOW OVEN CURVE………………………………………………………………………………………………………………………………………………….. 11
REVISION HISTORY ……………………………………………………………………………………………………………. 11

ABOUT US …………………………………………………………………………………………………

Chengdu Ebyte Electronic Technology Co., Ltd.

Disclaimer

EWM103-WF7621A User Manual

The information in this document, including the URL address for reference, is subject to change without notice. Documents are provided “as is” without any warranty, including any warranty of merchantability, fitness for a particular purpose or non-infringement, and any warranty referred elsewhere of any proposal, specification or sampleThis document does not bear any responsibility, including the responsibility for any patent infringement caused by the use of the information in this document.This document does not grant any license for the use of intellectual property by estoppel or otherwise, whether express or implied.

The data in this paper are all from Ebyte laboratory, and the actual results may be slightly different.

It is hereby declared that all trade names, trademarks and registered trademarks mentioned here are the property of their respective owners.

The final interpretation right belongs to Chengdu Ebyte Electronic Technology Co., Ltd.
Notice:
The contents of this manual may be changed due to product version upgrade or other reasons. Ebyte Electronic Technology Co., Ltd. reserves the right to modify the contents of this manual without any notice or prompt. This manual is only used as a guide. Chengdu Ebyte Electronic Technology Co., Ltd. will try its best to provide accurate information in this manual. However, Chengdu Ebyte Electronic Technology Co., Ltd. does not guarantee that the contents of this manual are completely correct, and all statements, information and suggestions in this manual do not constitute any express or implied warranty.

Chengdu Ebyte Electronic Technology Co., Ltd.
1 Product Overview

EWM103-WF7621A User Manual

1.1 Product Introduction
a Gigabit routing gateway module developed by Chengdu Ebyte Electronic Technology Co., Ltd. with MediaTek MT76 21A 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
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)

Chengdu Ebyte Electronic Technology Co., Ltd.

EWM103-WF7621A User Manual

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 ;

Chengdu Ebyte Electronic Technology Co., Ltd.
2 Specifications

2.1 Basic parameters

Electrical parameters

unit

Operating voltage

Communication level

Supply current requirement

Operating

temperature temperature
Storage

temperature

humidity

use storage

V mA
%RH

Parameter Details
3.3V 3.3 5 00 -20 + 60
-40 + 8 5 10 95non-condensing
5 95 (no condensation)

EWM103-WF7621A User Manual
Remark Exceeding 3.5 V may permanently burn
the module Using 5V TTL may burn out
–

2.2 Hardware Parameters

Hardware Parameters
chip Flash Memory Kernel Packaging
Ethernet interface
UART Lite PCIe USB size weight

model
MT7621A 32MB
DDR3 128MB MIPS1004Kc
Patches
5 10M/100 /1000M adaptive
3-Way 3 -Way USB3.0×1+USB2.0×1 or USB2.0×2 50*50*3mm 11.1g

Remark
Customizable 16MB/8MB Customizable DDR 3 256M/64M/32MB
880 MHz, dual core –
The factory default firmware supports 1 WAN and 4 LAN interfaces . Both are host interfaces The error size is ±0.2mm The error is ±0.2g

Chengdu Ebyte Electronic Technology Co., Ltd.
2.3 Functional Block Diagram

EWM103-WF7621A User Manual

Chengdu Ebyte Electronic Technology Co., Ltd.
3 Mechanical Dimensions and Pin Definition

EWM103-WF7621A User Manual

Pin definition: Serial number 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16

Pin Name
3.3VD 3.3VD 3.3VD 3.3VD GND GND GND GND CTS3_N TXD2 RXD2 TXD3 RXD3 RTS2_N CTS2_N RTS3_N

Figure 2 EWM103-WF7621A
Pin Function Description
power supply power supply power supply power supply
land land land land UART Clear To Send UART TX Data UART RX Data UART TX Data UART RX Data UART Request To Send UART Clear To Send UART Request To Send

Default functionality
–
5

Chengdu Ebyte Electronic Technology Co., Ltd.

17 18 19 20 twenty one twenty two twenty three twenty four
25

USB_DP_1P USB_DM_1P
GND SSUSB_TXP SSUSB_TXN
SSUSB_RXP
SSUSB_RXN
GND
USB_DP_P0

USB_DM_P0

GND

ESW_TXVP_A_P0

ESW_TXVN_A_P0

ESW_TXVP_B_P0

ESW_TXVN_B_P0

ESW_TXVP_C_P0

ESW_TXVN_C_P0

ESW_TXVP_D_P0

ESW_TXVN_D_P0

ESW_TXVP_A_P1

ESW_TXVN_A_P1

ESW_TXVP_B_P1

ESW_TXVN_B_P1

ESW_TXVP_C_P1

ESW_TXVN_C_P1

ESW_TXVP_D_P1

ESW_TXVN_D_P1

GND

ESW_TXVP_A_P2

ESW_TXVN_A_P2

ESW_TXVP_B_P2

ESW_TXVN_B_P2

ESW_TXVP_C_P2

ESW_TXVN_C_P2

ESW_TXVP_D_P2

ESW_TXVN_D_P2

GND

USB Port1 data pin Data+ (USB2.0) USB Port1 data pin Data- (USB2.0)
land USB Port0 SS data pin TX+ (USB3.0)
USB Port0 SS data pin TX- (USB3.0)
USB Port0 SS data pin RX+ (USB3.0)
USB Port0 SS data pin RX+-(USB3.0)
land
SB Port0 HS/FS/LS data pin Data+ (USB3.0)
USB Port0 HS/FS/LS data pin Data(USB3.0) land
Port #0 MDI Transceivers Port #0 MDI Transceivers Port #0 MDI Transceivers Port #0 MDI Transceivers Port #0 MDI Transceivers Port #0 MDI Transceivers Port #0 MDI Transceivers Port #0 MDI Transceivers Port #1 MDI Transceivers Port #1 MDI Transceivers Port #1 MDI Transceivers Port #1 MDI Transceivers Port #1 MDI Transceivers Port #1 MDI Transceivers Port #1 MDI Transceivers Port #1 MDI Transceivers
land Port #2 MDI Transceivers Port #2 MDI Transceivers Port #2 MDI Transceivers Port #2 MDI Transceivers Port #2 MDI Transceivers Port #2 MDI Transceivers Port #2 MDI Transceivers Port #2 MDI Transceivers
land

EWM103-WF7621A User Manual
–
–
–
–
–
–
–
–

Chengdu Ebyte Electronic Technology Co., Ltd.

ESW_TXVP_A_P3

ESW_TXVN_A_P3

ESW_TXVP_B_P3

ESW_TXVN_B_P3

ESW_TXVP_C_P3

ESW_TXVN_C_P3

ESW_TXVP_D_P3

ESW_TXVN_D_P3

GND

ESW_TXVP_A_P4

ESW_TXVN_A_P4

ESW_TXVP_B_P4

ESW_TXVN_B_P4

ESW_TXVP_C_P4

ESW_TXVN_C_P4

ESW_TXVP_D_P4

ESW_TXVN_D_P4

ESW_P4_LED_0

ESW_P3_LED_0

ESW_P2_LED_0

ESW_P1_LED_0

ESW_P0_LED_0

ESW_DTEST

GE2_TXD3

GE2_TXD2

GE2_TXD1

GE2_TXD0

ESW_DBG_B

MDIO

MDC

GE2_TXEN

GE2_TXCLK

GE2_RXD3

GE2_RXD2

GE2_RXD1

GE2_RXD0

GE2_RXDV

Port #3 MDI Transceivers Port #3 MDI Transceivers Port #3 MDI Transceivers Port #3 MDI Transceivers Port #3 MDI Transceivers Port #3 MDI Transceivers Port #3 MDI Transceivers Port #3 MDI Transceivers
land Port #4 MDI Transceivers Port #4 MDI Transceivers Port #4 MDI Transceivers Port #4 MDI Transceivers Port #4 MDI Transceivers Port #4 MDI Transceivers Port #4 MDI Transceivers Port #4 MDI Transceivers Port #4 PHY LED indicators Port #3 PHY LED indicators Port #2 PHY LED indicators Port #1PHY LED indicators Port #0 PHY LED indicators
Digital test RGMII2 Tx Data bit #0 RGMII2 Tx Data bit #2 RGMII2 Tx Data bit #1 RGMII2 Tx Data bit #0
–
PHY Data Management
PHY Clock Management
RGMII2 Tx Data Valid RGMII2 Tx Clock
RGMII2 Rx Data bit #3 RGMII2 Rx Data bit #2 RGMII2 Rx Data bit #1 RGMII2 Rx Data bit #0 RGMII2 Rx Data Valid

EWM103-WF7621A User Manual
Note: When RGMII/MII is connected to external PHY, this pin is MDIO. Otherwise it is NC. Note: When RGMII/MII is connected to external PHY, this pin is MDC. Otherwise it is NC. –

Chengdu Ebyte Electronic Technology Co., Ltd.

GE2_RXCLK

GND

RXD1

TXD1

PORST_N

I2C_SCLK

I2C_SD

PCIE_TXN2

PCIE_TXP2

100

PCIE_RXN2

101

PCIE_RXP2

102

PCIE_CKN2

103

PCIE_CKP2

104

GPIO0

105

PERST_N

106

PCIE_TXP1

107

PCIE_TXN1

108

PCIE_RXP1

109

PCIE_RXN1

110

PCIE_CKN1

111

PCIE_CKP1

112

WDT_RST_N

113

PCIE_RXP0

114

PCIE_RXN0

115

PCIE_TXN0

116

PCIE_TXP0

117

PCIE_CKP0

118

PCIE_CKN0

119

GND

120

JTMS

121

JTDO

122

JTDI

123

JTRST_N

124

JTCLK

125

GND

126

ND_D7

127

ND_D6

128

ND_D5

129

ND_D4

130

ND_D3

131

ND_D2

132

ND_D1

133

ND_D0

RGMII2 Rx Clock land
UART TX Data UART RX Data Power-On Reset
I2C Clock I2C Data PCIE2_TX PCIE2_TX+ PCIE2_RX PCIE2_RX+ PCIE2_CLK PCIE2_CLK+
PCIE PCIE1_TX+ PCIE1_TX PCIE1_RX+ PCIE1_RX PCIE1_CLK PCIE1_CLK+ NC PCIE0_RX+ PCIE0_RX PCIE0_TX PCIE0_TX+ PCIE0_CLK+ PCIE0_CLK land JTAG Mode Select JTAG Data Output JTAG Data Input JTAG Target Reset JTAG Clock land NAND Flash Data7 NAND Flash Data6 NAND Flash Data5 NAND Flash Data4 NAND Flash Data3 NAND Flash Data2 NAND Flash Data1 NAND Flash Data0

EWM103-WF7621A User Manual
–
8

Chengdu Ebyte Electronic Technology Co., Ltd.

134

ND_RB_N

135

ND_RE_N

136

ND_CS_N

137

ND_CLE

138

ND_ALE

139

ND_WE_N

140

ND_WP

NAND Flash Ready/Busy NAND Flash Read Enable NAND Flash Chip Select NAND Flash Command Latch Enable NAND Flash ALE Latch Enable NAND Flash Write Enable NAND Flash Write Protect

5 Frequently Asked Questions

EWM103-WF7621A User Manual
–

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.

Chengdu Ebyte Electronic Technology Co., Ltd.
6 Welding Operation Instructions

EWM103-WF7621A User Manual

6.1 Reflow temperature

Reflow profile characteristics

Minimum temperature

Preheating /keeping

( Tsmin ) Maximum temperature
(T smax )

Leaded process assembly 100 150

Lead-free assembly 150 200

Time (T smin ~T smin )

60-120 seconds

Heating slope (T L ~T p )

3/sec, max.

Liquidus temperature ( TL )

183

217

T L above the holding time

60~ 90 seconds

Users must not exceed the Users must not exceed the

Package peak temperature Tp

temperature stated on the temperature stated on the product’s “Moisture Sensitivity” product’s “Moisture Sensitivity”

label.

p ) within 5°C of the specified

classification temperature (Tc) is shown

20 seconds

30 seconds

in the figure below.

Cooling slope (T p ~T L )

6/sec, max.

Time from room temperature to peak

6 minutes, longest

8 minutes, longest

temperature

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

Chengdu Ebyte Electronic Technology Co., Ltd.
6.2 Reflow Oven Curve

EWM103-WF7621A User Manual

Revision History

Version 1.0

Revision Date 2024-12-18

Revision Notes Initial release

Maintainer Hao

About us

Technical support: support@cdebyte.com Documents and RF Setting download link: https://www.ru-ebyte.com Thank you for using Ebyte products! Please contact us with any questions or suggestions: info@cdebyte.com ———————————————————————————————————–Web: https://www.ru-ebyte.com Address: B5 Mould Industrial Park, 199# Xiqu Ave, High tech Zone, Chengdu, Sichuan, China

Documents / Resources

EBYTE MT7621A Wireless Module [pdf] User Manual
EWM103-WF7621A, MT7621A Wireless Module, MT7621A, Wireless Module, Module

References

User Manual

MT7621A Wireless Module

Specifications

Product Overview

1. Product Introduction

2. Features

Product Usage Instructions

6. Welding Operation Instructions

6.1 Reflow Temperature

6.2 Reflow Oven Curve

Frequently Asked Questions (FAQ)

5.1 The Transmission Distance is Not Ideal

5.2 Modules Are Vulnerable to Damage

Documents / Resources

References

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