Broadcom BCM5722 - Figure 34: Transmit Data Flow

Programmer’s Guide BCM5722
10/15/07
Broadcom Corporation
Document 5722-PG101-R TX Data Flow Diagram Page 80
The following figure shows the basic driver flow to send a packet.
Figure 34: Transmit Data Flow
NIC Memory
Host Memory
Send BD 1
...
Send BD 2
Send BD 3
Send BD 4
Send BD 5
Send BD 6
Send BD 7
Send BD 8
SendBD 512
Frame
Buffer 1
Buffer 2
Buffer 3
Send Producer
Index
Buffer 3
Buffer 2
Buffer 1
Tx
Info
Tx
MAC
Send Consumer
Index
Status
Block
Status
Block
1
2
3
4
5
6
7
Send BD 1
...
Send BD n
Send BD n+1
Send BD n+2
SendBD 128
...
FIFO
Host Memory
NIC Memory
FIFO
Info
Tx
MAC