LAN9211 datasheet(49/147 Pages) SMSC

部件名	LAN9211

功能描述	High-Performance Small Form Factor Single-Chip Ethernet Controller with HP Auto-MDIX Support

PDF	147 Pages

Scroll/Zoom	100%

制造商	SMSC [SMSC Corporation]

网页	http://www.smsc.com

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49 / 147 page

High-Performance Small Form Factor Single-Chip Ethernet Controller with HP Auto-MDIX Support

Datasheet

SMSC LAN9211

Revision 2.9 (03-01-12)

DATASHEET

3.12.1

TX Buffer Format

TX buffers exist in the host’s memory in a given format. The host writes a TX command word into the

TX data buffer before moving the Ethernet packet data. The TX command A and command B are 32-

bit values that are used by the LAN9211 in the handling and processing of the associated Ethernet

packet data buffer. Buffer alignment, segmentation and other packet processing parameters are

included in the command structure. The following diagram illustrates the buffer format.

Figure 3.19 Simplified Host TX Flow Diagram

Idle

Check

available

FIFO

space

init

Write

Command

Write

Buffer

Last Buffer in

Packet

Not Last Buffer

Write

Start

Padding

(optional)

Read TX

Status

(optional)

TX Status

Available

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