LAN9211 datasheet(63/147 Pages) SMSC

部品番号	LAN9211

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

PDF	147 Pages

Scroll/Zoom	100%

メーカー	SMSC [SMSC Corporation]

ホームページ	http://www.smsc.com

Logo

63 / 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

3.13.2

RX Packet Format

The RX status words can be read from the RX status FIFO port, while the RX data packets can be

read from the RX data FIFO. RX data packets are formatted in a specific manner before the host can

read them as shown in Figure 3.26. It is assumed that the host has previously read the associated

status word from the RX status FIFO, to ascertain the data size and any error conditions.

Figure 3.27 shows the RX packet format when the RX checksum is enabled. The RX checksum data

appended to the data payload is treated just as an additional 4-bytes within the RX Data FIFO. The

RX checksum is enabled by setting the RXCOE_EN bit in the COE_CR—Checksum Offload Engine

Control Register. For more information on the RX checksum, refer to Section 3.6.1, "Receive

Checksum Offload Engine (RXCOE)".

Figure 3.26 RX Packet Format

ofs + First Data DWORD

Last Data DWORD

Host Read

Order

1st

2nd

Last

Optional Pad DWORD0

Optional Pad DWORDn

Optional offset DWORD0

Optional offset DWORDn

LAN9211 データシート(PDF) 63 Page - SMSC Corporation