User's Manual l TQMa8MxML UM 0103 l © 2022, TQ-Systems GmbH
Page 27
3.2.5
Interfaces
3.2.5.1
Overview
The following interfaces or signals are not available on the TQMa8MxML LGA pads and are used on the TQMa8MxML.
Table 18:
Internal interfaces
Interface
Chapter
Remark
USDHC3
eMMC, 8 bit
SDRAM
LPDDR4, 32 bit
GPIO1_IO04 / SD2_VSELECT
–
GPIO1_IO08 / IRQ#
–
PMIC Interrupt Request
RTC_RESET#
–
PMIC Reset output pin
3.2.5.2
ENET
The i.MX 8M Mini provides an Ethernet MAC which can operate in Gigabit full duplex mode.
RMII and RGMII can be used as interfaces, with RGMII being used for standard multiplexing.
The supply voltage must be set externally to 1.8 V, 2.5 V or 3.3 V via LGA pad V_ENET.
RMII is supported at 1.8 V and 3.3 V, RGMII at 1.8 V and 2.5 V. See also chapter 3.2.9.6.
The following table shows the signals used in RGMII mode.
Table 19:
ENET signals in RGMII mode
Signal
Direction
CPU ball
TQMa8MxML
Power group
ENET_MDC
O
AC27
V6
V_ENET
ENET_MDIO
I/O
AB27
U6
ENET_RD0
I
AE27
V3
ENET_RD1
I
AD27
V4
ENET_RD2
I
AD26
W5
ENET_RD3
I
AC26
W6
ENET_RX_CTL
I
AF27
W2
ENET_RXC
I
AE26
W3
ENET_TD0
O
AG26
V1
ENET_TD1
O
AF26
U2
ENET_TD2
O
AG25
U1
ENET_TD3
O
AF25
T2
ENET_TX_CTL
O
AF24
R2
ENET_TXC
O
AG24
T1
In RMII mode the following TQMa8MxML signals are omitted:
•
ENET_TD3
•
ENET_RD3
•
ENET_RD2
