The ERTEC 200 is intended for the implementation of PROFINET devices with RT and IRT functionality. With its integrated ARM946 processor and 2-port Ethernet switch with integrated PHYs and the option to connect an external host processor system to a local bus interface, it meets all the requirements for implementing PROFINET devices with integrated switch functionality.
In this case, the ARM master would have to pause in a “Wait” until the IRT master enables the EMIF slave again. To prevent this situation, monitoring is integrated into the IRT switch, which enables the slave momentarily via an IDLE state after 8 consecutive data transfers (burst or single access).
4.1.3 Booting via UART Boot mode via UART uses a bootstrap method that first downloads to the ERTEC200 a routine for operating the serial interface, which then performs the actual download of the program. After the boot operation, the UART interface can be used in a different capacity (e.g., as a terminal interface).
IRT Switch Reset The switch module can be reset by means of a register in the IRT switch. The reset function of the switch module is retained until the bit is revoked again. The internal PHYs can be reset either via the RESET_N pin or by the IRT switch controller via PHY_RES_N.
The ERTEC 200 generates 2 interrupt signals, LBU_IRQ0_N and LBU_IRQ1_N, to the external host. Both interrupts are generated in the IRT switch interrupt controller. Both signals are set by default to Low Active. However, they can also be assigned different parameters in the IRT switch.
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If the Power-ON-reset is used, then the PHYs are active after the RESET phase. If the PHY_Reset_N is used, and the SMI module in the IRT switch has not been activated, then the PHYs remain in the reset state (no power loss from the PHYs).
Only the ARM946E-S can access both address areas. IRT accesses to its own KRAM do not use the AHB bus. These accesses are implemented in the IRT switch controller. The KRAM can be addressed starting from the memory area 0x1010_0000. An access in the non-permissible register area is detected by an IRT-internal error signal and not by an AHB acknowledgement time-out error.