Microchip Technology SAMA7G54-EK, User Manual

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• Ethernet 10/100 interface
• Gigabit Ethernet interface
• USBA host/device
• USBB host interface
• USBC host interface
• Dual mikroBUS Click interfaces
• Dual CAN interfaces
• RPi connector Interface
• RPi CSI camera interface
• S/PDIF RX/TX interfaces
• Quad MEMS microphones
• Wi-Fi/Bluetooth module (optional)
• Secure Digital Multimedia Card (SDMMC)
• Secure element
• Tamper pins connector
3.4.1 Ethernet Interfaces
3.4.1.1 Ethernet 10/100 Interface
The KSZ8081 is a single-supply 10Base-T/100Base-TX Ethernet physical-layer transceiver for transmission and
reception of data over a standard CAT-5 unshielded twisted pair (UTP) cable. The KSZ8081 is a highly-integrated
PHY solution. It reduces board cost and simplifies board layout by using on-chip termination resistors for the
differential pairs and by integrating a low-noise regulator to supply the 1.2V core, and by offering 1.8/2.5/3.3V digital
I/O interface support.
The KSZ8081RNA is connected over the Reduced Media Independent Interface (RMII) directly to the RMII-compliant
MAC inside the SAMA7G5 MPU. As the power-up default, the KSZ8081RNA uses a 25 MHz MEMS oscillator to
generate all required clocks, including the 50-MHz RMII reference clock output for the MAC.
For more information about the KSZ8081RNx, refer to the product web page .
An indiviual unique 48-bit MAC address (Ethernet hardware address) is allocated to this product and is stored in one
of the Microchip 24AA025E48 TWI serial EEPROMs described in
Dual Serial EEPROM .
Additionally, for monitoring and control purposes, the RJ45 connectors feature a LED functionality to indicate activity,
link, and speed status.
Figure 3-31. RMII Ethernet Interface Schematic
GND
GND-ETH1
25MHz
10ppm
ECS-250-20-33-CKM-TR
1
3
Y8
GND
GND
VDD_3V3
GND
0R 0603
R182
GND_ETH1 GND GND-ETH1
20pF
50V
0402
C193
20pF
50V
0402
C192
i
ETH1
Matched Net Lengths [Tolerance = 0.25mm]
nRST
10uF
25V
0603
C187
10uF
25V
0603
C189
0.1uF
10V
0402
C184
0.1uF
10V
0402
C185
ETH1_XO_25M
ETH1_XI_25M
1k
0402
5%
R172
1k
0402
5%
R173
VDD_3V3
10k
0402
1%
R174
470R
0603
1%
R175
VDD_3V3
GND
6.49k
0402
1%
R177
ETH1_TXEN_PD21
ETH1_TX0_PD22
ETH1_TX1_PD23
ETH1_RX0_PD25
ETH1_RX1_PD26
ETH1_TXCK_PD30
0.1uF
10V
0402
C188
0.1uF
10V
0402
C190
0.1uF 10V 0402
C183
ETH1_RX_N
ETH1_RX_P
ETH1_TX_N
ETH1_TX_P
RMII ETHERNET 100Mbps TRANSCEIVER
TXP
6
TXM
5
RXP
4
RXM
3
VDD_1V2
1
GND
22
PADDLE
25
REXT
9
XI
8
XO
7
REF_CLK 16
TXD1 21
TXD0 20
TXEN 19
RXD1 12
RXD0 13
RXER 17
CRS_DV/PHYAD[1_0]
15
MDC 11
MDIO 10
INTRP 18
VDDA_3V3 2
VDDIO 14
LED0/ANEN_SPEED 23
RST 24
KSZ8081RNAIA-TR
U15
3
1
2
5
6
4
4X 75R
1nF,2kV
TX+
TX-
RX+
RX-
4
5
7
8
Right
10
9 8 7
Left
11
12
1
2
3
6
TD+
TD-
TCT
RD-
RD+
RCT
MODULAR RJ45 J6
CO
N
RJ
-4
5
08
B0
-1
D1
T-
06
-F
GND_ETH1
GND
GND
VDD_3V3
STB 1
GND
2
OUT 3
VDD
4
DSC1001DI5-025.0000
Y7
GND
ETH1_RXER_PD27
ETH1_CRSDV_PD24
ETH1_MDC_PD28
ETH1_MDIO_PD29
ETH1_INT_PA21
ETH1_LED
ET
H1
_L
ED
10k
0402
1%
R176
GND
ETH1_XO_25M
ETH1_XI_25M
0402
R181
0402
R184
ETH1_XI_25M
51R
0402 1%
R178
0.1uF
10V
0402
C191
DIFF100
DIFF100
DIFF100
DIFF100
nRST_OUT
100R 0402 5% R179
100R 0402 5%
R180
ETH1_nRST
2.2uF 10V 0402
C186
ETH1_1V2
120R
BLM18PG121SN1D
FB7
120R
BLM18PG121SN1D
FB8
1M
0402
1%
R183
OSC_STBY
100 Ω ±10% differential trace impedance
Routing top or bottom
50 Ω ± 10% single-ended trace impedance
SAMA7G54-EK
Function Blocks
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User Guide
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