Version 1.0
Page 16
Figure 7
– PHY Strapping Circuit and Modes
The following table lists the various strapping options that are available for the 10/100/1000 Ethernet PHY
on the UltraZed-EG SOM and the default mode that they are strapped too. For a definition of what other
options are available by changing the default mode settings, please refer to the
Texas Instruments
DP83867
data sheet.
Table 9
– 10/100/1000 Ethernet PHY Strapping Configuration
PHY1 Strap Function
PHY1 Pin Name Mode Set
Function Value
PHYADD[1:0]
RX_D0
2
“01”
PHYADD[3:2]
RX_D2
1
“00”
EEE Disable / Autoneg Disable
RX_CTRL
3
“10”
RGMII Clock Skew RX[0]
GPIO_0
1
“0”
RGMII Clock Skew RX[2:1]
GPIO_1
2
“01”
RGMII Clock Skew TX[1:0]
LED_2
3
“10”
SPEED_SEL / RGMII Clock Skew TX[2]
LED_1
1
“00”
Mirror Enable / SGMII Enable
LED_0
1
“00”
This
set PHY1 ADDRESS to “0001”, RGMII RX Clock Skew to “001” for 1.0ns skew, RGMII TX Clock Skew
to “001” for 1.0ns skew, and SPEED SEL to “0” for Tri-Mode Ethernet.
2.5.2
Ethernet PHY LEDs
The UltraZed-EG SOM contains a single Ethernet PHY controlled LED, the LINK LED. On board the end-
user carrier card or within the RJ45 Ethernet Jack on the end-user carrier card, two additional Ethernet PHY
controlled LED signal are provided, SPEED and ACTIVITY.SPEED and ACTIVITY LEDs need to be
implemented on the end-user carrier card. Care must be taken when implementing these LEDs as the
signals being driven onto the JX3 connector by the Ethernet PHY are at 1.8V and that may not be enough
to illuminate the LEDs in an RJ45 jack or other on-board LED circuitry. A recommendation for the end-user
carrier card would be to implement a circuit similar to the LINK LED that exists on the UltraZed-EG SOM.
2.5.3
SFVA625 Device Package Delay Compensation for 10/100/1000 Ethernet Interface
The Zynq Ult MPSoC device package delay is accommodated for in the layout of the Gigabit
Ethernet signal trace lengths. The average of min and max values for package delay is utilized to
compensate for the flight time caused by the delay associated with this package.