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Table 26. Non-processor configuration settings (continued)
Configuration signal
DIP switch
CPLD register
Description
CFG_MUX_UART2_SEL0,
CFG_MUX_uBUS1_UART_B
,
CFG_MUX_uBUS2_UART_B
SW2[6:5]
BRDCFG3[5:4]
Controls UART2 routing to RS232 transceiver
( DB9 connector P1A), mikroBUS1, or
mikroBUS2 module.
CFG_MUX_uBUS1_SPI_B,
CFG_MUX_uBUS2_SPI_B
SW2[8]
BRDCFG3[6]
Controls routing of SPI3 to mikroBUS1 or
mikroBUS2 module
CFG_MUX_uBUS1_PWM_B
,
CFG_MUX_uBUS2_PWM_B
SW2[7]
BRDCFG3[7]
Controls routing of PWM to mikroBUS1 or
mikroBUS2 module
DIP switches that are not listed in the above tables do not directly control board signals, rather they alter the behavior of the system
controller. See
on page 51 for complete details about DIP switches.
2.21.2 Reset sequencing
The system controller manages the reset sequencing during the system startup. After successful power sequencing (all "power
good" are reported from power supplies), reset sequencer asserts the PORESET_B signal.
The reset sequencing (including device configuration) is described in the following table.
Table 27. Reset sequence
Controller
Step
Action
Description
Reset sequencer
1
Assert all resets.
LS1028A PORESET_B is asserted if not already
asserted.
Device resets are asserted:
• RST_QSGMII_B
• RST_1GETH_B
• PEXM2_1_PERST0_B
• PEXM2_2_PERST0_B
• SATAM2_3_PERST0_B
• RST_IEEE1588_B
• RST_I2C_B
• RST_MEM1_3V3_B
• XSPI_x8_MEM_RST_B
• RST_eMMC_B
• RST_I2CMUX_B
• uBUS1_RST
• uBUS2_RST
The LS1028A processor asserts ASLEEP and
HRESET_B in response. ASLEEP is monitored with an
LED, otherwise the signals are ignored.
Table continues on the next page...
LS1028ARDB Functional Description
QorIQ LS1028A Reference Design Board Reference Manual, Rev. b, 11/2018
48
COMPANY CONFIDENTIAL
NXP Semiconductors
Содержание QorIQ LS1028A
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