MEDIATEK Ralink MT7620 - Page 206

PGMT7620_V.1.0_040503
Page 206 of 523
MT7620 PROGRAMMING GUIDE
Integrated 802.11n MAC/BBP and 2.4 GHz RF/FEM Router-on-a-Chip
2.19.6.1 PDMA Tx Field Descriptions
Bit
Name
Description
DWORD0
31:0
SDP0
Segment Data Pointer0
DWORD1
31
DDONE
DMA Done: Indicates DMA has transferred the segment pointed to by this Tx
descriptor.
30
LS0
Last Segment0: Data pointed to by SDP0 is the last segment.
29:16
SDL0
Segment Data Length0: Segment data length for the data pointed to by SDP0.
15
BURST
When set, the scheduler cannot hand over to other Tx queues. Should not transmit
the next packet.
14
LS1
Last Segment1: Data pointed to by SDP1 is the last segment.
13:0
SDL1
Segment Data Length1: Segment data length for the data pointed to by SDP1.
DWORD2
31:0
SDP1
Segment Data Pointer1
DWORD3 (TXINFO)
31
ICO
IP checksum offload enable
30
UCO
UDP checksum offload enable
23
TCO
TCP checksum offload enable
28
TSO
TCP segmentation offload
27:20
FP_BMAP
Forced destination port on GSW
bit[0:5]: Ports 0 to 5
bit[6]: CPU
bit[7]: PPE
FP_BMAP = 0: routing by DA
19:15
UDF
User defined field
14
0
Reserved
13
0
Reserved
12
INSP
Insert PPPoE header
11:8
SIDX
PPPoE session index
7
INSV
Insert VLAN tag
6:4
VPRI
VLAN priority tag to be inserted
3:0
VIDX
VLAN ID index