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The IEEE signals are multiplexed with the SAI4 signals (see
on page 28) and LS1028ARDB uses the multiplexer
74LVC2G3157DPJ (U92, from Nexperia) to demux. The IEEE signals available on header J11 and J13 depend upon the RCW
settings and the appropriate signal through the CPLD. For more information on the RCW settings, see
QorIQ LS1028A Reference
Manual
.
on page 28 shows the architecture of the IEEE 1588 system.
The table below lists the testing options provided by the IEEE 1588 test header.
Table 10. IEEE 1588 port
IEEE 1588 feature
Specifications
Description
Clocks
Input clock
ETH reference clock (to processor) is driven from an onboard 125 MHz
oscillator source. Under software configuration, it may be clocked from the
IEEE 1588 header instead.
Signals
Other related signals
All remaining IEEE 1588 signals are connected to the dedicated header pins
Table 11. IEEE1588 and IEEE1722 signals
Signal name
Connector name and
Designator
Description
Availability with Audio
1588_PULSE_OUT2
1PPS(IEEE1588) (J12)
SMA connector
Yes
1588_CLK_OUT
IEEE1588 (J11)
IEEE1588 header
Yes
1588_ALARM_OUT[1]
IEEE1588 (J11)
IEEE1588 header
No
1588_PULSE_OUT1
IEEE1588 (J11)
IEEE1588 header
No
SWITCH_1588_DAT1
TSN Switch IEEE1588 &
IEEE1722 (J13)
IEEE1588 signals from TSN
switch
No
SWITCH_1588_DAT0
TSN Switch IEEE1588 &
IEEE1722 (J13)
IEEE1588 signals from TSN
switch
No
EC1_1722_DAT0
TSN Switch IEEE1588 &
IEEE1722 (J13)
IEEE1722 synchronization
signal for audio
Yes
EC1_1722_DAT1
TSN Switch IEEE1588 &
IEEE1722 (J13)
IEEE1722 synchronization
signal for audio
No
1588_TRIG_IN1
IEEE1588 (J11)
IEEE1588 header
Yes
1588_CLK_IN
IEEE1588 (J11)
IEEE1588 header
Yes
1. This signal is available only when RCW field EC1_SAI4_5_PMUX is set to 3'b101 (IEEE1588).
2.9 Synchronous audio interface (SAI)
The LS1028ARDB board supports audio through NXP SGTL5000-32QFN audio codec (U93). The board supports one audio
LINEOUT (J34) for headphone and stereo speakers. The figure below shows the LS1028ARDB audio interface architecture.
LS1028ARDB Functional Description
QorIQ LS1028A Reference Design Board Reference Manual, Rev. b, 11/2018
30
COMPANY CONFIDENTIAL
NXP Semiconductors
Содержание QorIQ LS1028A
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