EVK-IRIS-W10 - User guide
UBX-23007837 - R03
Hardware description
Page 30 of 43
C1-Public
Figure 33: mikroBUS4 schematic
Table 18: mikroBUS 4 working standard options, (*) default connection
3.9
RMII
The IRIS-W10 EVB supports RMII standard through 10BASE-T/100BASE-TX Physical Layer
Transceiver
U1
(KSZ8081MNXRNB) and 1 Port
RJ45
Surface Mount 10/100 Base-T,
AutoMDIX
T1
(74980111211).
RMII is enabled by default. However, there are four groups of resistors that demultiplex the
RMII signals (described in
) from other functions that cannot be used simultaneously
with RMII, as shown in
•
Group 1, Flexcomm
F14
RX, TX, RTS
signals – populate
R111, R263, R265
with
0R
and
disconnect
R115, R264, R266
.
•
Group 2, Flexcomm
F3
Clock signal – populate
R279
with
0R
and disconnect
R282.
•
Group 3, 32.768 kHz external crystal oscillator – populate
R268, R272
with
0R
and
disconnect
R269, R267, R271, R272.
•
Group 4, pin headers and reset signals – populate
R210, R277, R278, R283, R284, R286
with
0R
and disconnect
R270, R275, R276, R280, R281, R285
.
UART
SPI
I2C
RX
TX
MOSI
MISO
SDA
SCL
mikroBUS 4
GPIO 57
J19*
J77
J78
GPIO 56
J17*
J74
J75
