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3.4.2 Reset
The AM64x/AM243x device has the following reset signals:
• RESET_REQz is the warm reset input for MAIN domain.
• RESETSTATz is the warm reset status output for MAIN domain.
• PORz_OUT is the power ON reset status output from MAIN and MCU domain.
• MCU_PORz is the power ON/Cold Reset input for MCU and MAIN domain.
• MCU_RESETz is the Warm Reset input for MCU domain.
• MCU_RESETSTATz is the Warm Reset status output for MCU domain.
The two supervisor outputs and reset from JTAG are input to an AND gate to generate the PORz signal. This
PORz, the CONN_MCU_PORz from safety connector, and PCIe_MCU_PORz from PCIe connector are input to
another AND gate to generate the MCU_PORz signal.
Three push button switches are available to provide reset for MCU_PORz, MCU_RESETz and RESET_REQz.
Warm reset can also be applied through Test automation header or manual reset switches SW4(SoC) and
SW6(MCU).
MCU_PORz input can be applied though switch SW7.
The CONN_MCU_RESETz and CONN_MCU_PORz from the safety connector are routed to MCU_RESETz and
MCU_PORz respectively thereby providing option for safety connector to create a warm reset and a cold reset
as shown in the
Figure 3-5 .
Most peripheral resets are “ANDED” with the RESETSTATz output from the SoC along with a GPIO control as
shown in
Figure 3-5 . This ensures that the peripheral reset is asserted until the SoC is out of reset and allows
the AM64x to manually assert reset to the peripheral.
Figure 3-5. Overall Reset Architecture of the AM64x/AM243x EVM
System Description www.ti.com
12 AM64x/AM243x EVM User's Guide SPRUJ63 – SEPTEMBER 2022
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