Ethernet Phy Characteristics; Signal Description; External Connectivity; Gigabit Ethernet Phys Characteristics - Enclustra Mercury+ XU7 User Manual

2.19.1

Ethernet PHY Characteristics

Table 28 describes the Ethernet PHY devices assembled on the Mercury+ XU7 SoC module.
PHY Type
KSZ9031RNX
Table 28: Gigabit Ethernet PHYs Characteristics
2.19.2

Signal Description

PHY 0 is connected to ETH 0 controller from the PS I/O bank 501. One of the Ethernet TX data signals
is shared with the PCIe reset signal ﴾PERST#﴿; if the application requires a hard PCIe block, the ETH 0
interface is not available. Refer to Section
Tip
Remember that the gigabit Ethernet 0 interface is not available when the PCIe endpoint in the PS is
used, because of the PERST# connection.
PHY 1 is connected to ETH 3 controller from the PS bank 502. The corresponding MIO signals ﴾pins 64
to 75﴿ are shared between Ethernet PHY 1 and USB PHY 1, therefore only one of them can be used. By
default the Ethernet connection is enabled.
Tip
Remember that the USB 1 and Gigabit Ethernet 1 interfaces cannot be used simultaneously.
USB1_RST#_ETH1_RST is pulled to GND via a 1 k resistor; to release the USB PHY from reset, this signal
must be driven high from MIO[23]. ETH1_RST# is pulled to 1.8 V via a 10 k resistor; if USB1_RST#_ETH1_RST
signal is driven high from the PS, the Ethernet reset is connected to GND.
Both reset signals ﴾for Ethernet and USB﴿ are pulled to GND if the PS_POR# is active. Table
the behavior of the USB1/ETH1 selection circuit; the default selection is marked in bold.
Condition
PS_POR# USB1_RST#_ETH1_RST ﴾MIO[23]﴿
0 ‐
1 0
1 1
Table 29: USB1/ETH1 Selection
The two Gigabit Ethernet PHYs have a shared MDIO interface and a shared interrupt signal line. The
interrupt outputs of the Ethernet PHYs are connected to the I2C interrupt signal line, which is available
on the MIO pin 12.
2.19.3

External Connectivity

The Ethernet signal lines can be connected directly to the magnetics. Refer to the Enclustra Module Pin
Connection Guidelines [10] for details regarding the connection of Ethernet signals.
D‐0000‐443‐001
Manufacturer
Microchip ﴾Micrel﴿
2.8.2 for details on the PERST# connection.
USB PHY 1
In reset
In reset
Active
40 / 61
Type
10/100/1000 Mbit
29
Function
Ethernet PHY 1
In reset
Active
In reset
Version 10, 30.01.2024
describes