750
/
838
Nations Technologies Inc.
Tel
：
+86-755-86309900
：
Address: Nations Tower, #109 Baoshen Road, Hi-tech Park North.
Nanshan District, Shenzhen, 518057, P.R.China
Bit field
Name
Description
signal is disabled.
1: MAC delay check function is enabled. If the delay exceeds the 24288 bit time, an
excessive delay error occurs and MAC will abort the transmission. But if a valid CRS
signal is detected within the delay time, the delay counter will be reset to 0 and the
delay timing will be restarted.
3
TE
Enable transmitter.
0: MAC closes transmit state machine. If the current frame is being transmitted, it will
be closed after transmitting is completed.
1: MAC enables transmit state machine.
2
RE
Enable receiver.
0: MAC closes receiving state machine. If the current frame is being received, it will
be closed after receiving is completed.
1: MAC enables receive state machine.
1:0
Reserved
Reserved, the reset value must be maintained.
25.5.3
ETH MAC frame filter register (ETH_MACFFLT)
Address offset: 0x0004
Reset value: 0x0000 0000
MAC Frame Filter Register contains the filter control bits for received frames.
Bit field
Name
Description
31
RA
Receive all frames.
This bit controls the frame filter function.
0: Only received frames that pass the address filter will be forwarded to the
application.
1: All received frames will be forwarded to application, but the result of the filtering
will be reflected in the corresponding flags in the updated receive descriptor status
information.
30:11
Reserved
Reserved, the reset value must be maintained.
10
HPF
HASH or perfect filtering.
0: If ETH_MACFFLT.HMC or ETH_MACFFLT.HUC is set to 1, only frames that
conform to the HASH filter can pass the receive address filter.
1: If ETH_MACFFLT.HMC or ETH_MACFFLT.HUC is set to 1, and the received
frame passes either HASH filter or the perfect filter, it is considered that it has passed
the receiving address filter.
