Table 6. SW1 settings (continued)
Switch
Supported function
Settings
CFG_RCW_SRC[0:8]
• 0_0100_0000: Micro-SD card
• 1_0000_01xx: NAND flash (8-bit bus, 2 KB page, 64 pages/block)
(LS1043A only)
1
• 0_1001_1110: Hard-coded RCW
SW1[10]
System clock source
CFG_ENG_USE0
• 0: DIFF_SYSCLK/DIFF_SYSCLK_B (differential clock) - 100 MHz (fixed)
(default setting)
• 1: SYSCLK (single-ended clock) - 100 MHz (fixed)
1. The LS1046A processor does not support booting from NAND flash.
9 LEDs
The FRWY-LS1046A has light-emitting diodes (LEDs) to monitor system functions, such as power-on, reset, board faults, and
so on. The information collected from LEDs can be used for debugging purposes. LEDs are highlighted in
Figure 4
and
Figure
5
. The table below describes the FRWY-LS1046A LEDs.
Table 7. FRWY-LS1046A LEDs
Reference designator LED color
LED name
Description (when LED is ON)
D2
Yellow
ASLEEP
The processor has not exited Sleep mode, which
generally indicates:
• Improper RCW source selection
• Boot memory does not contain a valid
RCW/PBL
• PLL multipliers in the RCW data are not
compatible with the fixed SYSCLK, DDRCLK,
or SDCLK values
D4
Green
USB1_5V
USB1 port of the dual-port USB connector (J70) is
powered with 5 V supply for external USB device
D508
Green
USB2_5V
USB2 port of the dual-port USB connector (J70) is
powered with 5 V supply for external USB device
D510
1
Green
M.2 Card1
The M.2 PCIe module on M.2 PCIe slot 1 (J46) is
powered properly and its transmitter is ready to
transmit
D511
Green
M.2 Card2
The M.2 PCIe module on M.2 PCIe slot 2 (J52) is
powered properly and its transmitter is ready to
transmit
D509
Green
4_GRN_LED
Four stacked LEDs to indicate:
• Power status
• System readyness
• PROG_SFP fuse programming power enable
1. It is placed on the bottom side of PCB next to J46 connector.
NXP Semiconductors
LEDs
Layerscape FRWY-LS1046A Board Getting Started Guide, Rev. 1, 05/2020
User's Guide
9 / 14
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