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
•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 |
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SU.TFRC | This register determines if the current frame is retransmitted due to various | |||
transmit errors |
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SU.TFSL and SU.TFSH | These 2 registers provide the real time status of the transmit frame. Only apply | |||
to the last frame transmitted. |
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SU.RFSB0 to 3 | These registers provide the real time status for the received frame. Only apply | |||
to the last frame received. |
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SU.RFRC | This register provides settings | for reception or rejection of | frame based | on |
errors detected by the MAC. |
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| |
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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. |
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SU.MACCR | This register provides configuration control for the MAC |
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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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