PHY_TXD0
PHY_TXD1
PHY_TXD2
PHY_TXD3
RXD3_P2
RXD1_P2
RXD2_P2
RXD0_P2
PHY_TXC
RXDV_P2
RXC_P2
PHY_RXDV
PHY_RXD0
PHY_RXD1
PHY_RXD2
PHY_RXD3
PHY_RXC
RX+_P2
TX+_P2
RX-_P2
LED0_U2
LED1_U2
TX-_P2
RST#_U2
PHY_TXEN
PHY_TXEN
CRS_U2
PHY_TXD0
LED1_U2
LED0_U2
LED1_U2
LED0_U2
RXER_U2
CRS_U2
RXER_U2
RX+_U2
TX+_U2
TX-_U2
RX-_U2
RX-_U2
TX+_U2
RX+_U2
TX-_U2
MDIO
MDC
PHY_TXD2
PHY_TXD1
3.3V_U2
3.3V_U23.3A_U2
3.3V_U2
3.3A_U2
3.3V_U2
3.3V_U2
U2_CHASSIS_GND
U2_CHASSIS_GND EXT_GND
PHY_TXD3 (3)
PHY_TXEN (3)
PHY_TXD0 (3)
PHY_TXD1 (3)
PHY_TXD2 (3)
PHY_RXD3 (3)
PHY_RXD2 (3)
PHY_RXD1 (3)
PHY_RXD0 (3)
PHY_RXDV (3)
PHY_RXC (3)
PHY_TXC (3)
CLK_U2(3)
MDC (3)
MDIO (3)
(32-QFN)
U2
Push
Button
Reset
1. KSZ8081 has a Paddle Ground on bottom side of chip.
Refer to datasheet for mechanical dimensions.
Notes:
Strapping Options (Refer to datasheet for descriptions)
ISO
CONFIG2
CONFIG1
SPEED
DUPLEX
NWAYEN
LED1
SPEED
LINK/ACT
LED0
110
MII normal mode000
Mode (description)CONFIG[2:0]
MII Back-to-Back
MII Back-to-Back mode is required
when connecting KSZ8061 to KSZ8081.
On this board, the KSZ8081 is never used
in MII normal mode.
LEDs
Place R97 nearer to power connector J8.
FB5 should also be placed nearer to J8 than to J6.
PHYAD1
PHYAD2
GND
Place this GND test
point on bottom side;
Center and connect to
Paddle Ground of U2.
R69 4.7KR69 4.7K
R67 33R67 33
R72 Opt/1KR72 Opt/1K
C63
1uF
C63
1uF
C71
2.2uF
C71
2.2uF
R93 Opt/4.7KR93 Opt/4.7K
R57 75R57 75
R79 220R79 220
S2
SW PUSHBUTTON
S2
SW PUSHBUTTON
1 2
3 4
C69
1uF
C69
1uF
C29
1000pF / 2kV
C29
1000pF / 2kV
U2
KSZ8081MNX
U2
KSZ8081MNX
GND
1
VDD_1.2
2
VDDA_3.3
3
RXM
4
RXP
5
TXM
6
TXP
7
XO
8
XI
9
REXT
10
MDIO
11
MDC
12
RXD3
13
RXD2
14
RXD1
15
RXD0
16
VDDIO
17
RXDV
18
RXC
19
RXER
20
INTRP
21
TXC
22
TXEN
23
TXD0
24
TXD1
25
TXD2
26
TXD3
27
COL
28
CRS
29
LED0
30
LED1
31
RST#
32
GND
33
R80 220R80 220
R45
6.49K
R45
6.49K
J6
RJ-45 Jack
J6
RJ-45 Jack
8
7
6
5
4
3
2
1
TH1
TH2
R97 optR97 opt
R71 Opt/1KR71 Opt/1K
R75
10K
R75
10K
R54 75R54 75
C21
10uF
C21
10uF
R64 33R64 33
R30 33R30 33
R55 75R55 75
TP7TP7
C22
1uF
C22
1uF
R73 Opt/1KR73 Opt/1K
R29 33R29 33
C23
10uF
C23
10uF
C20
0.1uF
C20
0.1uF
T2
TDK TLA-8T104WLF
T2
TDK TLA-8T104WLF
1
2
3
6
8
7
16
15
14
11
10
9
R74 4.7KR74 4.7K
D5
BAV16W-7 SOD-123
D5
BAV16W-7 SOD-123
2 1
R68 4.7KR68 4.7K
FB5
FBEAD
FB5
FBEAD
1 2
R65 33R65 33
C30
0.1uF
C30
0.1uF
R56 75R56 75
FB7
FBEAD
FB7
FBEAD
12
C26
0.1uF
C26
0.1uF
R66 33R66 33
R70 Opt/4.7KR70 Opt/4.7K
C24
1uF
C24
1uF
D7
LEDx2
D7
LEDx2
1 2
3 4
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