miriac SBC-S32G-R3_User Manual
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© MicroSys Electronics GmbH 2021
6.4.8 100Mbps LAN (ST20)
The SJA1110A automotive Ethernet switch includes a 100Mbps PHY.
Signals are directly connected to ST20.
Externally there is 1 pair for transmit (pins 1, 2) and 1 pair for receive (pins 3, 6).
LED
Signal (in SCM)
GPIO (on SJA1110)
Pin
GN
CBTX_LED_GN
GPIO15
M5
YE
CBTX_LED_YE
GPIO14
L5
Table 6-19 100Mbps LEDs
6.4.9 1000Base-T1 (ST23)
Marvell PHY 88Q2112 is connected to SJA1110 port 2:
88Q2112 (J8)
SJA1110
Pin
Name
Pin
Name
23
RX_CLK
→
→
B5
AETH_MII2_RX_CLK
22
RX_CTRL
→
→
A3
AETH_MII2_RXDV
21
RXD0
→
→
A5
AETH_MII2_RXD0
20
RXD1
→
→
B4
AETH_MII2_RXD1
19
RXD2
→
→
A4
AETH_MII2_RXD2
18
RXD3
→
→
B3
AETH_MII2_RXD3
25
TX_CLK
←
←
B6
AETH_MII2_TX_CLK
27
TXD0
←
←
A8
AETH_MII2_TXD0
28
TXD1
←
←
B8
AETH_MII2_TXD1
29
TXD2
←
←
A7
AETH_MII2_TXD2
30
TXD3
←
←
B7
AETH_MII2_TXD3
26
TX_CTRL
←
←
A6
AETH_MII2_TX_EN
39
MDIO
↔
↔
C16
AETH_MDIO
38
MDC
←
←
C15
AETH_MDC
Table 6-20 Port 1 interface to SJA1110 port 2
ST23
Signal (in SCM)
Port (SJA1110)
88Q2112
1
L1000B-T1_P
Port 2
4
2
L1000B-T1_N
Port 2
5
Table 6-21 ST23 Pinout
