Table 23. Ethernet Management Interface (EMI1/2) pin termination checklist (continued)
Signal Name
IO type
Used
Not Used
Completed
EMI2_MDC will be actively driven
and pull up resistors are not
required.
EMI2_MDIO
IO
The functionality of these signals
is determined by the EM2 field in
the reset configuration word
(RCW[EM2]).
To configure as open drain signal,
write EMI2_DMODE in reset
configuration word. If configured
as open-drain, pull this pin to
TVDD with a suitable resistor. The
value of pull-up resistor depends
on input impedance of all the
peripherals connected on EMI2
bus. More the peripherals or more
the impedance stronger the pull-
up. Typically 330ohm pull-up
should suffice for 3-4 peripherals.
Unless there is a requirement of
EMI2_MDIO being an open-drain,
it is advised to configure
EMI2_MDIO in "normal functional"
mode. In "normal functional"
mode, the EMI2_MDIO will be
actively driven. A pull up resistors
might still be required as the
peripherals on EMI bus might have
their EMI2_MDIO pins configured
as open-drain. The value of pull-up
resistor depends on total input
impedance of all the peripherals
connected.
NOTE
• Refer Ethernet A-010717: EMI - MDIO to MDC input hold time (tMDDXKH)
specification violation from LS1046A Chip errata.
• For MDC frequency greater than 2.5 MHz and less than (or equal to) 10 MHz, the
load on the MDC/MDIO pads must not exceed 75pf
5.14 Ethernet controller pin termination recommendations
The LS1046A/LS1026A supports two Ethernet Controllers (EC) which can connect to Ethernet PHYs using RGMII
protocols. Both, EC1 and EC2 operated using LVDD supply which supports 1.8 V/2.5 V operation.
Table 24. Ethernet controller pin termination checklist
Signal Name
I/O type
Used
Not used
Completed
EC1 in RGMII mode
Table continues on the next page...
Interface recommendations
QorIQ LS1046A Design Checklist , Rev. 2, 06/2020
36
NXP Semiconductors
