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LAN89730 Datasheet(PDF) 74 Page - Microchip Technology |
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LAN89730 Datasheet(HTML) 74 Page - Microchip Technology |
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74 / 218 page  LAN89730 DS60001348A-page 74 2013-2015 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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