Altera 40-Gbps Ethernet MAC and PHY MegaCore Function - Manual (Page 152)

CRC Configuration Register
Table 3-44: CRC Configuration Register
Address Name Bit Description HW
Reset
Value
Access
0x123
CRC_CONFIG
[1] The RX CRC configuration register. Possible
configurations include:
• 1’b0: removes RX CRC
• 1’b1: retains RX CRC
Turning on
PAD_CONFIG
(register 0x124 bit [0])
prevents this bit (
CRC_CONFIG
bit [1]) from having
any effect on padded packets.
1’b0 RW
[0] The TX CRC configuration register. Possible
configurations include:
• 1’b0: enables TX CRC insertion
• 1’b1: disables TX CRC insertion
1’b0 RW
MAC Feature Configuration Registers
The MAC feature configuration registers control the following additional MAC features in the RX and TX
datapaths:
• Padding configuration
• Preamble pass-through feature
• Inter-packet gap adjustment
Table 3-45: MAC Feature Configuration Registers
Address Name Bit Description HW
Reset
Value
Access
0x124 PAD_CONFIG [0] When set to 1, the IP core removes padding from
frames on the RX datapath. When you set this bit
to the value of 1, the IP core disables the
CRC_
CONFIG
(register 0x123 bit [1]) from having any
effect on padded packets.
0 RW
UG-01088
2014.12.15
CRC Configuration Register 3-105
Functional Description Altera Corporation
Send Feedback