Table 29. Startup sequence (continued)
Controller Step Action Description
5 Apply power to group 3 power
supplies.
Enable group 3 power supplies, wait for all members to
report “power good” (if supported):
• SD_OVDD
• GVDD
• VTT1
• VTT2
6 Complete power sequencer;
trigger reset sequencer.
Control transfers from power to reset handlers.
The power sequencer watches for power switch events
and will restart at power sequencer step 1 if any are
detected.
Reset sequencer
1 Assert all resets. LX2160A PORESET_B is asserted if not already
asserted.
Device resets are asserted:
• RST_PHY_40GE_B
• RST_PHY_25G_B
• RST_PHY_10G_B
• RST_EPHY[1:2]_B
• RST_SLOT[1:2]_B
• RST_QSFP_B
• RST_XSPI_B
• RST_EMMC_B
• RST_IEEESLT_B
• RST_I2CMUX_B
The LX2160A processor asserts ASLEEP and
HRESET_B in response. ASLEEP is monitored with an
LED, otherwise the signals are ignored.
2
Wait for reset clear. Wait for reset assertion to be released. The reset
sequencer will stall as long as any reset input is asserted:
• JTAG_RST_B
• SW_RST_B
3 Sample switches. Internal registers are reset to default values.
Registers that default to switch values are set now.
4 Drive configuration values. Reset-sampled configuration signals are driven:
• CFG_RCW_SRC[3:0]
Table continues on the next page...
NXP Semiconductors
LX2160ARDB Functional Description
QorIQ LX2160A Reference Design Board Reference Manual, Rev. 4, 07/2020
Reference Manual 54 / 116
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