Motorola MCF5281 ユーザーズマニュアル

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Chapter 17.  Fast Ethernet Controller (FEC)  

17-7

In the FEC, the descriptor control RISC initializes some registers after ECR[ETHER_EN]
is asserted. After the microcontroller initialization sequence is complete, the hardware is
ready for operation.

Table 17-4 shows microcontroller initialization operations.

After asserting ECR[ETHER_EN], the user can set up the buffer/frame descriptors and
write to the TDAR and RDAR. Refer to Section 17.6, “Buffer Descriptors” for more
details.

MSCR (optional)

Clear MIB_RAM (locations IPSBAR + 0x1200-0x12FC)

Initialize FRSR (optional)

Initialize EMRBR

Initialize ERDSR

Initialize ETDSR

Initialize (Empty) Transmit Descriptor ring

Initialize (Empty) Receive Descriptor ring

Initialize BackOff Random Number Seed

Activate Receiver

Activate Transmitter

Clear Transmit FIFO

Clear Receive FIFO

Initialize Transmit Ring Pointer

Initialize Receive Ring Pointer

Initialize FIFO Count Registers