Table 4-1. SYSCLK frequency selection
(continued)
SW3[1] SW3[2] Selected SYSCLK frequency
1 1 83.33 MHz
4.3 MPIC controller
The MPIC pins of the LS1043A processor are connected to several devices on board.
Connection to the Interrupt sources are done through voltage level shifters. LS1043A
MPIC assignments are listed in the table below.
Table 4-2. LS1043A interrupt assignments
Signal name Supported function Description
IRQ0_B RGMII1, RGMII2, and QSGMII PHY
interrupt
RTL8211FS and F104S8A PHY interrupt
IRQ1_B 10G Ethernet PHY interrupt AQR105-B1 PHY interrupt
IRQ2_B Thermal or PMIC interrupt Thermal warning or fault interrupt or PMIC fault
interrupt
IRQ11_B TDM riser card interrupt TDMR1 and TDMR2 interrupt
4.4 Temperature anode and cathode
The LS1043ARDB has two pins, TD1_Anode and TD1_Cathode. These pins are
connected to a thermal body diode on the die that allows direct temperature measurement.
The pins are connected to an SA56004ED device (U45) with dual-channel thermal
monitor. This allows you to take direct die temperature readings with an accuracy of ±1
°C.
In addition to triggering the software interrupts in case of thermal problems, the
SA56004ED temperature warning and alarm signals are used to drive indicators and are
connected to CPLD for monitoring. CPLD uses these signals to power down the system
to protect the LS1043ARDB from over-temperature failure.
Chapter 4 Clocks, Interrupts, and Temperature Monitoring
QorIQ LS1043A Reference Design Board Reference Manual, Rev. 4, 11/2017
NXP Semiconductors 45
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