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LAN9730 Datasheet(PDF) 74 Page - Microchip Technology |
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LAN9730 Datasheet(HTML) 74 Page - Microchip Technology |
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74 / 222 page  LAN9730/LAN9730i DS00001946A-page 74 2012-2015 Microchip Technology Inc. Figure 4-16 illustrates the use of a pre-pended checksum preamble when transmitting an Ethernet frame consisting of 3 payload buffers. FIGURE 4-16: TX EXAMPLE ILLUSTRATING A PRE-PENDED TX CHECKSUM PREAMBLE TX Command 'A' Pad DWORD 1 TX Command 'A' TX Command 'B' 10-Byte End Offset Padding Payload Fragment 2 TX Command 'A' TX Command 'B' Data Written to the Device Payload Fragment 3 TX Command 'A' TX Command 'B' TX Checksum Preamble Note: The TX Checksum Preamble is pre-pended to data to be transmitted. FS is set in TX Command 'A' and CK is set in TX Command 'B'. No start offset may be added. FS must not be set for subsequent fragments of the same packet. TX Command 'B' Payload Fragment 1 |
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