Table 107: Option Flags For Ethernet Transmit Channel - Broadcom BCM1250 User Manual

User Manual
10/21/02
Bits Name
3:0 pkt_mod This field indicates how the transmitter should modify the packet.
0000: Descriptor is not start of packet.
0001: Append CRC.
0010: Replace CRC.
0011: Append CRC and pad.
0100: Append VLAN tag and replace CRC.
0101: Remove VLAN tag and replace CRC.
0110: Replace VLAN tag and replace CRC.
0111: No Modifications.
1000: Reserved
1001: Replace source address and append CRC.
1010: Replace source address and replace CRC.
1011: Replace source address, append CRC and pad.
1100: Replace source address, append VLAN tag and replace CRC.
1101: Replace source address, remove VLAN tag and replace CRC.
1110: Replace source address, replace VLAN tag and replace CRC.
1111: Reserved
Descriptors with the SOP bit set in their transmit status flags must have a nonzero value in this field.
If the SOP bit is clear this field must be zero.
In packet FIFO modes all codes are reserved except for:
0000: Descriptor is not start of packet.
0001: Append CRC.
0111: No Modifications.
Document 1250_1125-UM100CB-R

Table 107: Option Flags for Ethernet Transmit Channel

Transmit Commands
B r oadco m C orp or ati on
BCM1250/BCM1125/BCM1125H
Description
Section 7: DMA Page 173