Visible to Intel only — GUID: sfo1410069977984
Ixiasoft
Visible to Intel only — GUID: sfo1410069977984
Ixiasoft
26.4. Test Considerations
The dedicated I/O pins are chained into the full chip JTAG boundary scan chain. However, in some power modes the HPS can be off or disabled. The SoC device provides a bypass MUX to remove the dedicated I/O pins from the scan chain in this situation.
The boundary scan phase is not required to include I/O configuration shift register (IOCSR) configuration for the CONFIG_IO instruction. The only requirement is that no software be executing on the HPS during boundary scan.
If CONFIG_IO mode is active during the boundary scan phase, the HPS is in cold reset, preventing any software interference with the boundary scan. However, if the I/Os are configured in user mode, CONFIG_IO mode is not active during the scan phase, and you must implement safeguards to prevent software from executing during scan.