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LAN9211 Scheda tecnica(PDF) 49 Page - SMSC Corporation |
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LAN9211 Scheda tecnica(HTML) 49 Page - SMSC Corporation |
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49 / 147 page  High-Performance Small Form Factor Single-Chip Ethernet Controller with HP Auto-MDIX Support Datasheet SMSC LAN9211 49 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 TX 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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