T2080NXE8MQLB View Datasheet(PDF) - NXP Semiconductors.
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T2080NXE8MQLB Datasheet PDF : 186 Pages
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Hardware design considerations
4.2.1.1.2 Example 2: Regulators supporting PMBus configuration
In this example, a user builds a VID solution using controllable regulators with a PMBus
interface. For the case where the regulator's interface operates at a different voltage than
DVDD, the chip's I2C module can be operated in an open-drain configuration.
In this implementation, the user chooses to utilize any I2C interface available on the chip.
These regulators have a means for setting a safe, default, operating value either through
strapping pins or through a default, non-volatile store.
NOTE
If I2C1 controller is selected, it is important that its calling
address is different than the 7-bit value of 0x50h used by the
pre-boot loader (PBL) for RCW and pre-boot initialization.
The general procedure for setting the core voltage regulator to the desired operating
voltage is as follows:
1. The board is responsible for configuring a safe default value for the controllable
regulator either through dedicated pins or its non-volatile store.
2. As part of the chip's boot process, software must read the efuse values stored in the
FUSESR register and then configure the voltage regulator based on this information.
The software decides on a new configuration and sends this value across the I2C
interface connected to the regulator's PMBus interface. Note that some regulators
may require a series of writes so that the voltage is slowly stepped from its old to its
new value.
3. When the voltage has stabilized, software adjusts the operating frequencies as
desired.
Upon completion of configuration, some regulators may have a write-protect pin to
prevent undesired data changes after configuration is complete. A single GPIO pin on the
chip could be allocated for this task, if desired.
4.2.1.1.3 Example 3: Regulators supporting FPGA/ASIC or separate power
management device configuration
In this example, a user builds a VID solution using controllable regulators that are
managed by a FPGA/ASIC or a separate power-management device. In this
implementation, the user chooses to utilize the IFC, eSPI or any other available chip
interface to connect to the power-management device.
The general procedure for setting the core voltage regulator to the desired operating
voltage is as follows:
1. The board is responsible for configuring a safe default value for the controllable
regulator either through dedicated pins or its non-volatile store.
QorIQ T2080 Data Sheet, Rev. 3, 03/2018
NXP Semiconductors
157
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