
User Manual - Rev1.0.2
M13design - 16 Dec. 21
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3.5
LAN INTERFACE
The
M13-RA6M3-EK
embarks an Ethernet PHY (U7) which communicate through the RA6M3 on-chip
ethernet controller ETHERC by using the RMII Interface. The details of this device can be seen in
. As for the RMII pin assignment they are displayed in
Table 18. Ethernet PHY Overview
Device Type
MFR
1
/ MPN
2
Operational Voltage
Bit Rate
Package
Ethernet PHY
Microchip /
KSZ8081RNA
3.3V
10 Mbps / 100 Mbps
N/A
RJ45 Connector
Wurth Elektronik /
7499011121A
N/A
N/A
Through-Hole
Note 1: Manufacturer name
Note 2: Manufacturer Part Number
Table 19. Ethernet Assignment Pins
U1 Pin
RA6M3 Pin Functions
Board
Assignment
Signal Name
Default
Function
Remarks
14
P706 / IRQ7
Multiplexed
ET0_ IRQ7
SD1CD
36
P415 / RMII0_TXDEN_A
Ethernet
RMII0_TXDEN_A
ETHERC (RMII)
37
P414 / RMII0_TXD1_A
Ethernet
RMII0_TXD1_A
ETHERC (RMII)
38
P413 / RMII0_TXD0_A
Ethernet
RMII0_TXD0_A
ETHERC (RMII)
42
P409 / RMII0_RX_ER_A
Ethernet
RMII0_RX_ER_A
ETHERC (RMII)
43
P408 / RMII0_CRS_DV_A
Ethernet
RMII0_CRS_DV_A ETHERC (RMII)
39
P412 / REF50_CK0_A
Ethernet
REF50_CK0_A
ETHERC (RMII)
41
P410 / RMII0_RXD1_A
Ethernet
RMII0_RXD1_A
ETHERC (RMII)
40
P411 / RMII0_RXD0_A
Ethernet
RMII0_RXD0_A
ETHERC (RMII)
2
P401 / ET0_MDC
Ethernet
ET0_MDC
ETHERC (RMII)
3
P402 / ET0_MDIO
Ethernet
ET0_MDIO
ETHERC (RMII)
172
P806
Ethernet
ET0_LED2
I/O port
P806 is configurated as a standard output to drive the second led available on the RJ45 connector CN6
through its pin LED2-. And as described in table 18, P706 is by default not connected to the Ethernet
PHY IRQ signal (Pin U7.18) but rather to the SD Card “Card Detection” pin (CN10.9). Follow
if you need interrupt capabilities on your Ethernet Interface.
Table 20. P706 Multiplexing
RA6M3
Pin
RA6M3
Pin Description
Selected
Function
SH41
SH42
14
P706 / SD1CD / IRQ7
ET0_IRQ7
Not Fitted
Fitted
SD1CD (Default)
Fitted
Not Fitted