
24
SAMA5D2 Xplained Ultra [USER GUIDE]
Atmel-44028B-ATARM-SAMA5D2-Xplained-Ultra-User Guide_02-Oct-15
5.4.2
Communication Interfaces
The SAMA5D2-XULT board is equipped with GMAC and USB Host/Device communication interfaces.
5.4.2.1 Ethernet 10/100 (GMAC) Port
The SAMA5D2-XULT board contains a MICREL PHY device (KSZ8081) operating at 10/100 Mb/s. The board
supports RMII interface modes. The Ethernet interface consists of two pairs of low-voltage differential pair signals
designated from GRX± and GTX± plus control signals for link activity indicators. These signals can be used to
connect to a 10/100 Base-T RJ45 connector integrated on SAMA5D2-XULT board.
Additionally, for monitoring and control purposes, LED functionality is carried on the RJ45 connectors to indicate
activity, link, and speed status information.
For more information about the Ethernet controller device, refer to the MICREL KSZ8081RN controller
manufacturer's datasheet.
Figure 5-20.
Ethernet (GMAC)
10Base-T/100Base-TX
Ethernet
LINK
ACT
top/bot
top/bot
top/bot
top/bot
ETH_LED0
ETH_LED0
TX+
TX+
ETH_XI
ETH_XO
ETH_LED1
ETH_LED1
TX-
RX+
RX-
RX-
RX+
TX-
EARTH_ETH
EARTH_ETH
GND_ETH
VDDA_3V3
VDD_3V3
VDD_3V3
VDD_3V3
VDD_3V3
NRST [4,9,10,14,15]
ETH_GRX0_PB18 [7]
ETH_GTX0_PB20 [7]
ETH_GRX1_PB19 [7]
ETH_GTXEN_PB15 [7]
ETH_GRXER_PB17 [7]
ETH_GRXDV_PB16 [7]
ETH_GTX1_PB21 [7]
ETH_INT_PC9 [8]
ETH_GMDIO_PB23 [7]
ETH_GMDC_PB22 [7]
ETH_GTXCK_PB14 [7]
R68
10K
R69
1K
R48
10K
R317
470R
U3
KSZ8081RNB
RXC/B-CAST_OFF
19
CRS/CONFIG1
29
COL/CONFIG0
28
TXD1
25
TXD0
24
TXEN
23
RXD3/PHYAD0
13
RXD2/PHYAD1
14
RXD1/PHYAD2
15
RXD0/DUPLEX
16
RXDV/CONFIG2
18
RXER/ISO
20
MDC
12
MDIO
11
INTRP/NAND
21
VDDA_3V3
3
VDDIO
17
RESET
32
TXP
7
TXM
6
RXP
5
RXM
4
VDD_1V2
2
GND
1
PADDLE
33
TXC
22
TXD2
26
TXD3
27
REXT
10
XO
8
XI
9
LED0/NWAYEN
30
LED1/SPEED
31
R45
1K
R34
10K
C25
100nF
C162
100nF
R33
10K
C36
10uF
R31
10K
C160
100nF
C21
100nF
R65
10K
C16
2.2uF
R60
10K
C12
10uF
C18
100nF
R66
10K
L2
180ohm at 100MHz
1
2
R67
10K
R70
6.49K 1%
1
2
3
6
4
5
7
8
75
75
75 75
1nF
TD+
TD-
CT
NC
RD-
CT
TX+
TX-
RX+
RX-
RD+
Left Green LED
Right yellow LED
J6
RJ45 Connector
1
2
7
8
3
6
5
4
9
10
11
12
13
14
15
16
R314
470R
R35
0R
R32
10K