Requirements
AT91CAP9-STK Starter Kit User Guide
2-17
6351B–CAP–27-Jun-08
2.4.1.3
F3: RMII 10/100 Base-T Fast-Ethernet PHY Auto-MDIX
The 10/100 Ethernet MAC function is implemented in the AT91CAP9 EMAC module.
This module manages an RMII 10/100 Base-T Fast-Ethernet PHY Auto-MDIX (SMSC LAN8700) to
implement a 10/100 Base-T Ethernet port.
The implementation is shown below.
The 1.8V core power supply is external by default, to minimize 3.3V power consumption.
Use of LAN8700 3.3V/1.8V internal regulator can be done by disconnected J36 and R71 REG_OFF Pull-
up.
R88
12K4
R68
0R
1
2
3
6
4
5
7
8
75
75
75
75
1nF
TD+
TD-
CT
NC
RD-
CT
TX+
TX-
RX+
RX-
RD+
J35
J00-0061NL
1
2
7
8
3
6
5
4
15
16
L7
BLM18PG600
1
2
Y4
IQXO71I_50Mhz
VCC
4
GND
2
OE
1
OUT
3
R69
22R
R67
10K
NC
C143
4,7uF
1
2
EPWDN#
R79
10R
1
2
pin 8
R156
1K
D9
YELLOW
2
1
MODE2
VDDIO_ETH
RXD1
RXD0
L10
BLM18PG600
1
2
VDDIO_ETH
VDDIO_ETH
C124
330pF
1
2
C142
100nF
1
2
D8
GREEN
2
1
1V8
C127
10nF
1
2
3V3_ANA_ETH
LED2
R80
10K
NC
C130
10nF
1
2
REG_OFF
R81
10K
NC
LED3
R82
22R
R78
10K
NC
EREFCK_O
REG_OFF
R71
10K
D7
GREEN
2
1
R76
49R9
R87
22R
D6
GREEN
2
1
R77
49R9
R83
22R
R84
49R9
C194
1nF_2KV
NC
1
2
R85
49R9
EREFCK
TP17
VDDIO_ETH
J36
R86
22R
3V3_ANA_ETH
MODE2
MODE1
MODE0
EMDC
R73
1K5
NC
R74
1K5
NC
LED4
REFCK
TX+
TX-
RX+
RX-
MODE=0x07
EMDIO
RMII
MODE0
EMIRQ#
TXD[1..0]
TXD0
TXD1
MODE1
RXD[1..0]
RMII
ETX[1..0]
ETXEN
REFCK
ERST#
EMDC
ECRSDV
EMIRQ#
ERXER
ERX[1..0]
EMDIO
LED1
1V8_CORE_ETH
PHYAD=0x1F
U11
LAN8700-AEZG
VD
D
A
33
VD
D
A
30
RX+
32
RX-
31
TX+
29
TX-
28
VD
D
A
35
LINK/PHYAD[1]
10
ACTIVITY/PHYAD[2]
11
FDUPLEX/PHYAD[3]
12
NINT/TX_ER/TXD4
1
TXD[3]
27
TXD[2]
26
TXD[1]
24
TXD[0]
23
TX_EN
6
TX_CLK
22
MDC
2
MDIO
4
RXD[3]/NINTSEL
15
RXD[2]/MODE2
16
RXD[1]/MODE1
17
RXD[0]/MODE0
18
VD
D
C
OR
E
8
SPEED100/PHYAD[0]
9
RX_CLK
20
RX_DV
19
CRS/PHYAD[4]
3
COL/MII/CRS_DV
36
RX_ER/RXD4
21
VD
D
IO
7
RST#
5
XTAL1/CLKIN
14
XTAL2
13
GN
D
37
REXT
34
VD
D
IO
25
R70
22R
C129
100nF
1
2
C128
100nF
1
2
R72
10K
R155
1K
R75
10K
1V8_CORE_ETH
R90
332R
R91
332R
R96
332R
R97
332R
C125
100nF
1
2
L8
BLM18PG600
1
2
C126
100nF
1
2
REXT