System Reset POR_B

VPK120 Evaluation Board User Guide (UG1568)

Document ID
Release Date
1.1 English

[Figure 1, callout 2]

POR_B is the Versal ACAP processor reset, which can be controlled by:

  • SYSCTLR (U125)
  • PC4 header (J36)
  • FTDI USB JTAG chip (U20)

In the following figure, U235 allows directional open drain level shifting for all of these masters, and J326 allows them to be bused together if desired. The TPS389001 U10 supervisor chip holds POR_B off until power is valid. The VPK120 board POR circuit is shown in the following figure.

Figure 1. POR_B Reset Circuit