Data Path; Tx Data Path - Motorola LA-51XX Driver Programmer's Manual

2-10 LA-51XX Compact Flash Adapter Driver Programmer's Guide

2.3 Data Path

The Data Path provides an interface to the operating system running on host and the firmware running on
device to handle ingress and egress calls of data transfer. These packets are Ethernet 802.3 packets.

2.3.1 Tx Data Path

2.3.1.1 Flow Diagram
2.3.1.2 Flow Description
1. The Network Stack delivers an 802.3 data frame for transmission to the Wireless Card by calling the
driver transmit function. The transmit function verifies whether the data frame can be transmitted or not
by assessing the queue availability.
2. It then converts the socket buffer to be transmitted into frame format having ic_msg and s_sm_frame
header and adds it to the queue.
3. The host driver adds the frame into Tx Queue Control Block and the Driver current queue pointer is
updated.