Datasheet

Table 6. FRWY-LS1046A power supply devices (continued)

Reference

designator

Device Power supply voltage Description

SW5LX: GVDD (1.2 V 3

• Supply for DDR controller input/output (GVDD)

• Supply for DDR4 SDRAM memory chips

SW6LX: DDR_VTT (0.6

V at 1 A)

Supply for DDR address and control bus termination

(VTT)

VTT_Mode is enabled (sink

current is up to 700 mA

(typical)).

NOTE

SW7LX: 2V5 (2.5 V at 1

• Supply for processor TVDD

• Supply for QSGMII PHY VDD25, VDD25A, and

DDR4 memory VPP

1. The PC33PF8100EAES is a programmable PMIC that generates most of the LS1046A power. Power configurations are

stored in its one-time programmable (OTP) memory. The configuration in volatile memory can be changed through the

I2C1_CH0 interface. The device is accessible at 0x08 I2C 7-bit address.

2.1.3 Power supply sequence

The FRWY-LS1046A is configured to switch ON automatically when the 12 V power adapter (12 V power supply source) is switched

ON and is connected to power jack (J1) on the board. When the 12 V supply is available to power regulators on the board, the

power good signals of these regulators enable all board power supplies in correct sequence.

The board does not have a power ON/OFF switch. To power ON/OFF the board, plug/unplug the 12 V power

adapter to/from the board.

NOTE

The figure below shows the FRWY-LS1046A power supply sequence.

FRWY-LS1046A Functional Description

Layerscape FRWY-LS1046A Board Reference Manual, Rev. 0, 26 April 2019

NXP Semiconductors