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LAN9211 数据表(PDF) 63 Page - SMSC Corporation |
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LAN9211 数据表(HTML) 63 Page - SMSC Corporation |
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63 / 147 page ![]() High-Performance Small Form Factor Single-Chip Ethernet Controller with HP Auto-MDIX Support Datasheet SMSC LAN9211 63 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 0 31 Host Read Order 1st 2nd Last Optional Pad DWORD0 . . Optional Pad DWORDn Optional offset DWORD0 . . Optional offset DWORDn |
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