Supply Sensors

Versal ACAP System Monitor Architecture Manual (AM006)

Document ID
AM006
Release Date
2022-05-17
Revision
1.3 English

The SYSMON includes on-chip sensors that allow monitoring of the device power-supply voltages using the ADC. All externally supplied power rails have an associated sensor, which can analyze any supply that might be critical to a system. Supply sensors sample and attenuate the power supply voltages to be compatible with the ADC operating requirements. The results of internal supply sensors are appropriately scaled and stored in the channel's data register in a floating-point voltage format. There are two types of supply sensors—Supply and Supply Extended. The Supply Extended range is used to sample supply voltages greater than 1.8V, i.e., HDIO bank supply voltage. Selecting the appropriate mode is automatically determined by the processor configuration IP. The Supply Sensor data format is defined in the Supply Sensor Data Format section.

Important: The SYSMON measures supply rails at the die level, while the data sheet supply requirements are given at the package ball. Because the DC resistance through the package can cause a supply’s level to drop after it reaches the SYSMON sensor, IR drop must be accounted for when setting alarm thresholds.

In general, all externally generated supplies are available to be monitored by the SYSMON with no limitations other than the 160 channel register locations for storing results. All sensors are equipped with the same channel features defined in Channel Features.

The following table provides some common supplies that can be enabled by the Control, Interface, and Processing IP by block type.

Table 1. Commonly Available Sensors by Block
Block Type Supply Sensors Available
PL core supplies VCCAUX, VCCINT, VCC_RAM
PS core supplies VCCINT_PMC, VCCAUX_PMC, VCC_PSLP, VCC_PSFP, VCC_SOC, VCC_BAT
SelectIO™ interface bank supplies and PSIO bank Voltages VCCO, VCC_IO
MGT supplies GTY_AVCC, GTY_AVCCAUX, GT_AVTT