Altera Triple Speed Ethernet MegaCore Function - Manual (Page 92)

Description R/W Name Bit(s)
Late collision condition.
• The MAC function sets this bit to 1 when it detects a
collision after transmitting 64 bytes and discards the frame.
• The MAC function clears this bit following a hardware or
software reset. See the
SW_RESET
bit description.
RO
LATE_COL
12
Software reset. Set this bit to 1 to trigger a software reset. The
MAC function clears this bit when it completes the software
reset sequence.
When reset is triggered, the MAC function completes the
current transmission or reception, and subsequently disables
the transmit and receive logic, flushes the receive FIFO buffer,
and resets the statistics counters.
RW
SW_RESET
13
Hash-code mode selection for multicast address resolution.
• Set this bit to 0 to generate the hash code from the full 48-
bit destination address.
• Set this bit to 1 to generate the hash code from the lower 24
bits of the destination MAC address.
RW
MHASH_SEL
14
Local loopback enable. Set this bit to 1 to enable local loopback
on the RGMII/GMII/MII of the MAC. The MAC function sends
transmit frames back to the receive path.
This bit is not available in the small MAC variation.
RW LOOP_ENA 15
Source MAC address selection on transmit. If you set the TX_
ADDR_INS
bit to 1, the value of these bits determines the MAC
address the MAC function selects to overwrite the source MAC
address in frames received from the user application.
• 000 = primary address configured in the
mac_0
and
mac_1
registers.
• 100 = supplementary address configured in the
smac_0_0
and smac_0_1 registers.
• 101 = supplementary address configured in the
smac_1_0
and
smac_1_1
registers.
• 110 = supplementary address configured in the
smac_2_0
and
smac_2_1
registers.
• 111 = supplementary address configured in the
smac_3_0
and
smac_3_1
registers.
RW TX_ADDR_SEL [2:0] 18 –
16
Magic packet detection. Set this bit to 1 to enable magic packet
detection.
This bit is not available in the small MAC variation.
RW
MAGIC_ENA
19
Altera Corporation Configuration Register Space
Send Feedback
6-9 Command_Config Register (Dword Offset 0x02)
UG-01008
2014.06.30