Figure 34: Transmit Data Flow - Broadcom BCM5722 Programmer's Manual

Programmer's Guide
10/15/07
The following figure shows the basic driver flow to send a packet.
Frame
Buffer 1
Buffer 2
Buffer 3
4
Send Producer
Index
Document 5722-PG101-R
Host Memor
Host Memory
Send BD 1
Send BD 2
Send BD 3
1
Send BD 4
Send BD 5
Send BD 6
Send BD 7
Send BD 8
2
SendBD 512
3
NIC Memory
NIC Memory
Send BD 1
Send BD n
Send BD n+1
Send BD n+2
SendBD 128

Figure 34: Transmit Data Flow

Bro adco m Co rp or atio n
y
Status
Block
7
6
Status
Block
5
Buffer 1
FIFO
FIFO
Tx
Buffer 2
Info
Info
Buffer 3
BCM5722
Send Consumer
Index
Tx
Tx
MAC
MAC
TX Data Flow Diagram Page 80