Altera Triple Speed Ethernet MegaCore Function User Manual
Page 32
• Enable MAC 10/100 half duplex support (10/100 Small MAC variations)
• Align packet headers to 32-bit boundary (10/100 and 1000 Small MAC variations)
Table 3-2: MAC Options Parameters
Description
Value
Name
Ethernet MAC Options
Turn on this option to include support for half
duplex operation on 10/100 Mbps connections.
On/Off
Enable MAC 10/100 half
duplex support
Turn on this option to enable local loopback on
the MAC’s MII, GMII, or RGMII interface. If
you turn on this option, the loopback function
can be dynamically enabled or disabled during
system operation via the MAC configuration
register.
On/Off
Enable local loopback on MII/
GMII/RGMII
Turn on this option to include support for
supplementary destination MAC unicast
addresses for fast hardware-based received frame
filtering.
On/Off
Enable supplemental MAC
unicast addresses
Turn on this option to include support for simple
network monitoring protocol (SNMP)
management information base (MIB) and remote
monitoring (RMON) statistics counter registers
for incoming and outgoing Ethernet packets.
By default, the width of all statistics counters are
32 bits.
On/Off
Include statistics counters
Turn on this option to extend the width of
selected statistics counters—
aOctetsTransmit-
tedOK
,
aOctetsReceivedOK
, and
etherStat-
sOctets
—to 64 bits.
On/Off
Enable 64-bit statistics byte
counters
Turn on this option to implement a hash table,
a fast hardware-based mechanism to detect and
filter multicast destination MAC address in
received Ethernet packets.
On/Off
Include multicast hashtable
Turn on this option to include logic that aligns
all packet headers to a 32-bit boundary. This
helps reduce software overhead processing in
realignment of data buffers.
This option is available for MAC variations with
32 bits wide internal FIFO buffers and MAC
variations without internal FIFO buffers.
You must turn on this option if you intend to
use the Triple-Speed Ethernet MegaCore
function with the Interniche TCP/IP protocol
stack.
On/Off
Align packet headers to 32-bit
boundary
Altera Corporation
Parameter Settings
3-3
Ethernet MAC Options
UG-01008
2014.06.30