Product Info

LTE Module Series
EC21 Hardware Design
EC21_Hardware_Design
3-54
/ 105
URC can be outputted from UART port, USB AT port and USB modem port through configuration via
AT+QURCCFG command. The default port is USB AT port.
In addition, RI behavior can be configured flexibly. The default behavior of the RI is shown as below.
Table 21: Behavior of RI
State
Response
Idle
RI keeps at high level
URC
RI outputs 120ms low pulse when a new URC returns
The RI behavior can be changed by AT+QCFG="urc/ri/ring" command. Please refer to document [2] for
details.
3.17. SGMII Interface
EC21 includes an integrated Ethernet MAC with an SGMII interface and two management interfaces, key
features of the SGMII interface are shown below:
 IEEE802.3 compliance
 Support 10M/100M/1000M Ethernet work mode
 Support VLAN tagging
 Support IEEE1588 and Precision Time Protocol (PTP)
 Can be used to connect to external Ethernet PHY like AR8033, or to an external switch
 Management interfaces support dual voltage 1.8V/2.85V
The following table shows the pin definition of SGMII interface.
Table 22: Pin Definition of the SGMII Interface
Pin Name
Pin No.
I/O
Description
Comment
Control Signal Part
EPHY_RST_N
119
DO
Ethernet PHY reset
1.8V/2.85V power domain
EPHY_INT_N
120
DI
Ethernet PHY interrupt
1.8V power domain
NOTE