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Table 11. Ethernet port locations (continued)
PHY address
Interface voltage
MAC number
Connector location (from
chassis/board back)
Status indicator
3
LVDD (1.8 V)
MAC5
P1 bottom
L: Transmit or receive activity
R: Link (any speed)
4
LVDD (1.8 V)
MAC6
P1 top
L: Transmit or receive activity
R: Link (any speed)
Ethernet signals are muxed with other interfaces, such as IEEE-1588; therefore, the LS1046ARDB implements NX3DV221TK
chips to demux.
2.5.1 IEEE-1588 support
The LS1046A includes support for the IEEE 1588 precision time protocol (PTP). This feature works in tandem with the internal
Ethernet controllers to time-stamp the incoming packets. The IEEE 1588 PTP is supported at a basic level with internal logic and
the use of a precision 125.00 MHz reference clock, with an accuracy of ±25 ppm. The figure below shows an overview of the
IEEE 1588 block.
QIXIS
LS1046A
1588_CLK_OUT
1588_CLK_IN
125.000 MHz
±25 ppm
cfg_1588_src
Figure 10. IEEE-1588 interface overview
2.6 Ethernet management interface
The LS1046ARDB has two Ethernet management interfaces EMI1 and EMI2, which are powered from LVDD (1.8 V) and TVDD
(2.5 V) domain respectively and are used to control separate PHY transceiver devices. The EMI1 bus is connected to the four
Realtek (RTL8211FS) PHYs. The EMI2 bus is connected to the Aquantia (AQR107) PHY. The EMI routing architecture is shown
in the figure below.
LS1046ARDB Functional Description
QorIQ LS1046A Reference Design Board Reference Manual, Rev. 2, 30 May 2019
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NXP Semiconductors