Lattice Semiconductor 10 Gb+ Ethernet MAC IP User Manual page 30

Lattice Semiconductor
Transmit and Receive Status (TX_RX_STS)
Table 5-9. Transmit and Receive Register Description
Name: TX_RX_STS
Bits Name
7:5 UNUSED
4 Link_ok
3 Remote_fault
2 Local_fault
1 Rx_idle
0 Tx_idle
VLAN Tag(VLAN_TAG_[0-1])
The VLAN tag register has the VLAN TAG field of the most recent tagged frame that was received. This is a read
only register.
Table 5-10. VLAN Tag Register Description
Name: VLAN_TAG_0
Bits Name
7:0 VLAN_TAG_0
Name: VLAN_TAG_1
Bits Name
7:0 VLAN_TAG_1
Multicast Tables, set of eight (MLT_TAB_[0-7])
When the core is programmed to receive multicast frames, a filtering scheme is used to decide whether the frame
should be received or not. The six middle bits of the most significant byte of the CRC value, calculated for the des-
tination address, are used as a key to the 64-bit hash table. The three most significant bits select one of the eight
tables, and the three least significant bits select a bit. The frame is received only if this bit is set.
Table 5-11. Multicast Table Register Description
Name: MLT_TAB_[0-7]
Bits Name
Multicast Table
7:0
[0-7]
IPUG39_02.9, December 2010
Type Default
Reserved
Link OK. When set, indicates that no fault symbols were received
RO 0
on the link.
Remote fault. When set, indicates that remote fault symbols were
RO 0
received on the link.
Local fault. When set, indicates that local fault symbols were
RO 0
received on the link.
Receive MAC Idle. When set, indicates that the RX MAC is inac-
RO 0
tive.
Transmit MAC Idle. When set, indicates that the TX MAC is inac-
RO 0
tive.
Type Default
RO 0 VLAN Tag ID. Upper byte
Type Default
RO 0 VLAN Tag ID. Lower byte.
Address: A10H, A11H, A12H, A13H, A14H, A15H, A16H, A17H
Type Default
R/W 0 Multicast Table. Eight tables that make a 64-bit hash.
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Application Support
Address: A0DH
Description
Address: A0EH
Description
Address: A0FH
Description
Description
10 Gb+ Ethernet MAC IP Core User's Guide