DS33Z41 Quad IMUX Ethernet Mapper

MII error asserted during the reception of the frame.

Dribbling bits occurred in the frame.

CRC error occurred.

Length error occurred—the length indicated by the frame length is inconsistent with the number of bytes received.

Control frame was received. The mode must be full duplex.

Unsupported control frame was received.

Note that frames received that are runt frames or frames with collision will automatically be rejected.

Table 8-7. Registers Related to the Ethernet Port

REGISTER

 

FUNCTION

 

 

 

 

SU.TFRC

This register determines if the current frame is retransmitted due to various

transmit errors

 

 

 

 

 

 

 

SU.TFSL and SU.TFSH

These 2 registers provide the real time status of the transmit frame. Only apply

to the last frame transmitted.

 

 

 

 

 

 

 

 

 

SU.RFSB0 to 3

These registers provide the real time status for the received frame. Only apply

to the last frame received.

 

 

 

 

 

 

 

SU.RFRC

This register provides settings

for reception or rejection of

frame based

on

errors detected by the MAC.

 

 

 

 

 

 

 

SU.RMFSRH and SU.RMFSRL

The settings for this register

provide the maximum size

of frames to

be

accepted from the MII/RMII receive interface.

 

 

 

 

 

 

 

 

 

SU.MACCR

This register provides configuration control for the MAC

 

 

 

 

 

 

 

8.13.1 DTE and DCE Mode

The Ethernet MII/RMII port can be configured for DCE or DTE Mode. When the port is configured for the DTE Mode it can be connected to an Ethernet PHY. In DCE mode, the port can be connected to MII/RMII MAC devices other than an Ethernet PHY. The DTE/DCE connections for the DS33Z41 in MII mode are shown in the following two figures.

In DCE Mode, the DS33Z41 transmitter is connected to an external receiver and DS33Z41 receiver is connected to an external MAC transmitter. The selection of DTE or DCE mode is done by the hardware pin DCEDTES.

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Maxim DS33Z41 specifications Registers Related to the Ethernet Port, DTE and DCE Mode