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Field
Name
R/W
Description
ETH_DMASTS[2]: Transmit buffer is unavailable
ETH_DMASTS[6]: Receive interrupt
ETH_DMASTS[14]: Early receive interrupt
Only the unmasked bit affects the normal interrupt summary bit.
This is a sticky bit and it must be cleared each time the
corresponding bit that causes this bit to be set is cleared.
19:17
RXSTS
R
Receive Process State
This field indicates the receive DMA FSM state. This field does not
generate any interrupt.
000: Stop: Issue the reset or stop receiving command
001: Run: get the receive and transmit descriptors
010: Reserved
011: Run: wait for receiving message
100: Pending: the receive descriptor is unavailable
101: Run: disable the receive descriptor
110: Reserved
111: Run: in the progress of transmitting the received packet data
from receive buffer to host memory
22:20
TXSTS
R
Transmit Process State
This field indicates the transmit DMA FSM state. This field does
not generate any interrupt.
000: Stop: issue the reset or stop transmission command
001: Run: get the transmit descriptor
010: Run: waiting state
011: Run: read data from host memory buffer and queue the
transmit buffer (Tx FIFO)
100, 101: Reserved
110: Suspended: the transmit descriptor is unavailable or the
transmit buffer underflows
111: Run: disable the transmit descriptor
25:23
ERRB
R
Error Bits
This field indicates the type of error that causes the bus error,
such as the error response of the AHB interface. This field is valid
only when the bit [13] is set. This field does not generate any
interrupt.
000: An error occurs in transmission process of Rx DMA write
data
011: An error occurs in transmission process of Tx DMA read data
100: An error occurs in Rx DMA descriptor write access
101: An error occurs in Tx DMA descriptor write access
110: An error occurs in Rx DMA descriptor read access
111: An error occurs in Tx DMA descriptor read access
26
Reserved
27
MMCFLG
R
MMC Flag
This bit reflects an interrupt event in the MMC module of MAC.
The software must read the corresponding register in the MAC to
obtain the exact cause of the interrupt, and clear the interrupt