Texas Instruments TIDA-050043, Design Manual, Page: 13 / 31

3V3 3V3
NVCC_ENET
ENET1_TX_EN
ENET1_TX_DATA0
ENET1_TX_DATA1
33 Ÿ
33 Ÿ
33
Ÿ
i.MX 6ULL
ENET_MDC
ENET_MDIO
NVCC_GPIO
2x1 RJ45
with internal
magnetics
3V3
ENET_MDIO_A 1.5 k
Ÿ
RXER_A
2.2 k Ÿ
RXER_B
2.2 k Ÿ
2.2 k Ÿ
VSS
ENET1_RX_EN
ENET1_RX_DATA0
ENET1_RX_DATA1
33 Ÿ
33 Ÿ
33 Ÿ
33 Ÿ
ENET1_RX_ER
IOVDD
3V3
TXD0_A
TXD1_A
TXEN_A
RXD1_A
MDC
MDIO
ANAVDD
3V3
MEDIA
DEPENDENT
INTERFACE
ESD
PUSB3F96
X1
50-MHz OSC
ASFL1-50.000-MHZ-EC-T
CRSDV_A
RXD0_A
RXER_A
ENET2_RX_EN
ENET2_RX_DATA0
ENET2_RX_DATA1
33 Ÿ
33 Ÿ
33 Ÿ
33 Ÿ
ENET2_RX_ER
TXD0_B
TXD1_B
TXEN_B
RXD1_B
MEDIA
DEPENDENT
INTERFACE
ESD
PUSB3F96
VSS
CRSDV_B
RXD0_B
RXER_B
ENET2_TX_DATA0
ENET2_TX_DATA1
33 Ÿ
33 Ÿ
33 Ÿ
ENET2_TX_EN
PHY ADDR:
0b00000
PHY ADDR:
0b00001
3V3
ED_EN_A
ED_EN_B
2.2 k Ÿ
RXD0_A
2.2 k Ÿ
2.2 k Ÿ
DP83849I
RBIAS
.
MII_MODE_A
MII_MODE_B 2.2 k Ÿ
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System Overview
13 TIDUEW7 – May 2020
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Integrated Power Supply Reference Design for NXP i.MX 6ULL
2.3.2 DP83849I - Dual Ethernet PHY
i.MX 6ULL supports two 10/100Mbps (MII/RMII) Ethernet interfaces. This design requires two 100 Base-T
Ethernet ports so the DP83849I-Dual Ethernet PHY is used in this design. This Ethernet PHY supports
two RMII interface and able to work from a single 3.3V supply. The PHY needs an external 50MHz
oscillator to function properly. To connect MDI to the Cat5e cable, we used a dual RJ45 connector with
internal magnetics from Wurth Elektronik. The addresses for the two separate PHYs are listed in
Table 2 .
Table 2. PHY Addresses
PHY Number PHY Address
PHY1 0b00000
PHY2 0b00001
The Ethernet interface connections are shown in Figure 12 .
DESCRIPTION MFG. PART NUMBER
IC, DP83849I, Dual Port, 10/100 Ethernet PHY
Transceiver, TQFP-80 Texas Instruments DP83849IVSX/NOPB
Connector, RJ45 Jack with Magnetics, Shielded,
LED(G/Y, G/Y), RA, TH Wurth Elektronik 7499111446
Figure 12. Ethernet Interface With DP83849I PHY