Altera Low Latency Ethernet 10G MAC User Manual
Page 60
Word
Offset
Register Name
Description
Access
HW Reset
Value
0x0028
tx_preamble_control
(4)
• Bit 0—configures the preamble
passthrough mode on transmit.
0: Disables preamble passthrough. The
MAC IP core inserts the standard
preamble specified by the IEEE 802.3
specifications into the data frame.
1: Enables preamble passthrough. The
MAC IP core identifies the first 8 bytes of
the data frame from the client as a custom
preamble.
• Bits 31:1—reserved.
Configure this register before you enable the
MAC IP core for operations.
RW
0x0
0x002A
tx_src_addr_override
• Bit 0—configures source address override.
0: Disables source address override. The
client must fill the source address field
with a valid address..
1: Enables source address override. The
MAC IP core overwrites the source
address field in data frames with the
primary MAC address specified in the
tx_
primary_mac_addr0
and
tx_primary_
mac_addr1
registers.
• Bits 31:1—reserved.
Configure this register before you enable the
MAC IP core for operations.
RW
0x0
0x002C
tx_frame_maxlength
• Bits 15:0—specify the maximum allowable
frame length. The MAC IP core uses this
register only for the purpose of collecting
statistics. When the length of the data
frame from the client exceeds this value,
the MAC IP core asserts the
avalon_st_
txstatus_error[1]
signal to flag the
frame as oversized. The MAC IP core then
forwards the oversized frame through the
transmit datapath as is.
• Bits 31:16—reserved.
Configure this register before you enable the
MAC IP core for operations.
RW
0x5EE (1518)
(4)
This register is used only when you turn on Enable preamble pass-through mode option. It is reserved
when not used.
4-8
TX_Configuration and Status Registers
UG-01144
2014.12.15
Altera Corporation
Configuration Registers for LL Ethernet 10G MAC