Ethernet (ETH): media access control (MAC) with DMA controller RM0033
920/1381 RM0033 Rev 9
Bits 9:8 RFFL: Rx FIFO fill level
This gives the status of the Rx FIFO fill-level:
00: RxFIFO empty
01: RxFIFO fill-level below flow-control de-activate threshold
10: RxFIFO fill-level above flow-control activate threshold
11: RxFIFO full
Bit 7 Reserved, must be kept at reset value.
Bits 6:5 RFRCS: Rx FIFO read controller status
It gives the state of the Rx FIFO read controller:
00: IDLE state
01: Reading frame data
10: Reading frame status (or time-stamp)
11: Flushing the frame data and status
Bit 4 RFWRA: Rx FIFO write controller active
When high, it indicates that the Rx FIFO write controller is active and transferring a received
frame to the FIFO.
Bit 3 Reserved, must be kept at reset value.
Bits 2:1 MSFRWCS: MAC small FIFO read / write controllers status
When high, these bits indicate the respective active state of the small FIFO read and write
controllers of the MAC receive frame controller module.
Bit 0 MMRPEA: MAC MII receive protocol engine active
When high, it indicates that the MAC MII receive protocol engine is actively receiving data
and is not in the Idle state.
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