Due to a problem with the Linear Voltage Regulators (LTM46XX) used on some of the Intel® Agilex™ FPGA Rev A Development Kits, you may experience configuration failures when using Intel® Quartus® Prime Pro Edition Software v21.2. This failure occurs because the voltage required by Intel® Agilex™ devices during configuration is higher than the voltage the LTM46XX Regulators are programmed to supply.
You might see the following error messages during configuration:
- Error(18948): Error message received from device: External hardware access error. (Subcode 0x0032, Info 0x00800008, Location 0x00001800)
- Error(22248): Detected a PMBUS error during configuration. Potential errors: VID setting is incorrect in the Intel Quartus Prime project. The target device fails to communicate to a smart regulator or PMBUS master on a board.
To solve this problem, you will need to reconfigure the Non-Volatile Memory registers of the Linear Voltage Regulator using a Linear Technologies USB-to PMBus Controller and the Linear Technologies LTpowerPlay Software.
Using the PMBus Controller and the LTpowerPlay software, configure the following register values for the LTM46XX device:
- VOUT_MAX = 1.0V
- VOUT_OV_FAULT_LIMIT = 30%
- VOUT_OV_WARN_LIMIT = 30%
Changing these values will configure the LTM46XX Voltage Regulator to operate within the required voltage range and allow the Intel® Agilex™ device to configure successfully.