stm32 /stm32h5 /STM32H573 /ETH /ETH_DMACSR

Transmit Interrupt This bit indicates that the packet transmission is complete. When transmission is complete, Bit 31 of TDES3 is reset in the last descriptor, and the specific packet status information is updated in the descriptor.

Transmit Process Stopped This bit is set when the transmission is stopped.

Transmit Buffer Unavailable This bit indicates that the application owns the next descriptor in the Transmit list, and the DMA cannot acquire it. Transmission is suspended. The TPSi field of the Debug status register (ETH_DMADSR) register explains the Transmit Process state transitions. To resume processing the Transmit descriptors, the application should do the following:

1. Change the ownership of the descriptor by setting Bit 31 of TDES3.
2. Issue a Transmit Poll Demand command. For ring mode, the application should advance the Transmit Descriptor Tail Pointer register of a channel.

Receive Interrupt This bit indicates that the packet reception is complete. When packet reception is complete, Bit 31 of RDES1 is reset in the last descriptor, and the specific packet status information is updated in the descriptor. The reception remains in the Running state.

Receive Buffer Unavailable This bit indicates that the application owns the next descriptor in the Receive list, and the DMA cannot acquire it. The Rx process is suspended. To resume processing Rx descriptors, the application should change the ownership of the descriptor and issue a Receive Poll Demand command. If this command is not issued, the Rx process resumes when the next recognized incoming packet is received. In ring mode, the application should advance the Receive Descriptor Tail Pointer register of a channel. This bit is set only when the DMA owns the previous Rx descriptor.

Receive Process Stopped This bit is asserted when the Rx process enters the Stopped state.

Receive Watchdog Timeout This bit is asserted when a packet with length greater than 2,048 bytes (10,240 bytes when Jumbo Packet mode is enabled) is received.

Early Transmit Interrupt This bit indicates that the packet to be transmitted is fully transferred to the MTL Tx FIFO.

Early Receive Interrupt This bit indicates that the DMA filled the first data buffer of the packet.The RI bit of this register automatically clears this bit.

Fatal Bus Error This bit indicates that a bus error occurred (as described in the EB field). When this bit is set, the corresponding DMA channel engine disables all bus accesses.

Context Descriptor Error This bit indicates that the DMA Tx/Rx engine received a descriptor error, which indicates invalid context in the middle of packet flow (intermediate descriptor) or all one’s descriptor in Tx case and on Rx side it indicates DMA has read a descriptor with either of the buffer address as ones which is considered to be invalid.

Abnormal Interrupt Summary Abnormal Interrupt Summary bit value is the logical OR of the following when the corresponding interrupt bits are enabled in the ETH_DMACIER register: Bit 1: Transmit Process Stopped Bit 7: Receive Buffer Unavailable Bit 8: Receive Process Stopped Bit 10: Early Transmit Interrupt Bit 12: Fatal Bus Error Bit 13: Context Descriptor Error Only unmasked bits affect the Abnormal Interrupt Summary bit. This is a sticky bit. You must clear this bit (by writing 1 to this bit) each time a corresponding bit, which causes AIS to be set, is cleared.

Normal Interrupt Summary Normal Interrupt Summary bit value is the logical OR of the following bits when the corresponding interrupt bits are enabled in the ETH_DMACIER register: Bit 0: Transmit Interrupt Bit 2: Transmit Buffer Unavailable Bit 6: Receive Interrupt Bit 11: Early Receive Interrupt Only unmasked bits (interrupts for which interrupt enable is set in ETH_DMACIER register) affect the Normal Interrupt Summary bit. This is a sticky bit. You must clear this bit (by writing 1 to this bit) each time a corresponding bit which causes NIS to be set is cleared.

Tx DMA Error Bits This field indicates the type of error that caused a Bus Error. For example, error response on the AHB interface. Bit[2]: Error during data transfer by Tx DMA when 1, no Error during data transfer by Tx DMA when 0 Bit[1]: Error during descriptor access when 1, Error during data buffer access when 0 Bit[0]: Error during read transfer when 1, Error during write transfer when 0 This field is valid only when the FBE bit is set. This field does not generate an interrupt.

Rx DMA Error Bits This field indicates the type of error that caused a Bus Error. For example, error response on the AHB interface. Bit [2]: Error during data transfer by Rx DMA when 1, no Error during data transfer by Rx DMA when 0. Bit[1]: Error during descriptor access when 1, Error during data buffer access when 0 Bit[0]: Error during read transfer when 1, Error during write transfer when 0 This field is valid only when the FBE bit is set. This field does not generate an interrupt.