SAM4E-EK User Guide
42067A
−
SAM4E
−
01/2013
13
4.3.8 RS485
As noticed above the USART1 is shared with the RS485 port, connected to the transceiver MN6 and output to the 3-
point connector J6. The design includes selectable jumpers for RS485 bus termination resistors selection (JP10, JP12,
and JP13).
Figure 4-7. RS485.
PA25
JP13
R52
DNP
PA21_485
JP10
R50
0R
R48
0R
R51
120R
J6
1
2
3
R47
0R
R45
DNP
R46
10K
C52
100nF
R49
0R
MN6
ADM3485ARZ
RO
1
RE
2
DE
3
DI
4
VCC
8
GND
5
A
6
B
7
+3V3
+3V3
+3V3
FGND
JP12
TXD1
RXD1
CTS1
RTS1
PA22
RS 485
PA24
4.3.9 Ethernet MAC 10/100 (EMAC)
The EMAC module implements a 10/100 Ethernet MAC compatible with the IEEE
®
802.3 standard using an address
checker, statistics and control registers, receive and transmit blocks, and a DMA interface.
The Atmel SAM4E-EK is equipped with a MICREL KSZ8051MNL 10/100 Mbps Fast Ethernet Physical Layer
transceiver. It contains the entire physical layer functions of 100BASE-TX as defined by IEEE 802.3u.
The Ethernet interface provides MII for 100Base-TX or 10Base-TX. The MII interfaces are capable of both 10Mb/s and
100Mb/s data rates as described in the IEEE 802.3u standard. The Ethernet interface integrates an RJ45 connector
with an embedded transformer, and two status LEDs.
Figure 4-8. Ethernet block.
FGND
ETH1_XI
ETH1_XO
Y4
25MHz
1
2
3
4
C79
100nF
R108
4.7K
R107
4.7K
+3V3
+3V3
R111
0R
C86
22pF
R109
470R
R112
0R
C76
100nF
R110
470R
GND_ETH
RXDV
RJ45 ETHERNET CONNECTOR
C77
2.2uF
At the De-Assertion of Reset:
PHY ADD[2:0]:001
CONFIG[2:0]:000,Mode:MII
Duplex Mode:Half Duplex
Isolate Mode:Disable
Speed Mode:100Mbps
Nw ay Auto-Negotiation:Enable
ETH PHY
C82
100nF
C85
22pF
GND_ETH
R85
22R
R104
22R
GND_ETH
R105
22R
R86
22R
R87
22R
R88
22R
R89
22R
R90
22R
R91
22R
R92
22R
R93
22R
R94
22R
R96
22R
R98
22R
COL
E1_RXCK
RXER
E1_CRS
TXD3
R84
22R
C78
100nF
TXD2
1
2
3
6
4
5
7
8
75
75
75
75
1nF
TD+
TD-
CT
NC
RD-
CT
TX+
TX-
RX+
RX-
RD+
J20
J00-0061
1
2
7
8
3
6
5
4
13 14
9
10
11
12
RXC
TXD0
TXD1
E1_COL
PD3
PD14
PD7
PD2
RXD0
PD12
RXD3
PD[0..31]
PD11
FGND
ETH1_XO
R99
22R
RXM
RXP
TXP
+3V3
TXM
CT_TX
CT_RX
L5
220ohm at 100MHz
1
2
RXD2
NRST
C81
10uF
C83
10uF
+3V3
TXC
ETH1_XI
R100
22R
MN9
KSZ8051MNL
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
RR4
4.7k
1 2 3 4
5
6
7
8
PD16
PD4
PD15
E1_TXCK
TXEN
PD1
PD28
PD9
PD5
PD6
PD8
E1_RXDV
PD0
E1_TX0
E1_RX1
E1_RX0
E1_MDC
E1_MDIO
E1_TXEN
INT_ETH1
E1_RXER
+3V3
RR3
4.7k
1 2 3 4
5
6
7
8
E1_TX1
C84
100nF
E1_TX2
FGND
PD10
E1_TX3
E1_RX2
E1_RX3
PD13
RXD1
CRS
R103
22R
E1_AVDDT
R106
6.49K
R102
4.7K
R101
4.7K
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