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W5200 Datasheet(PDF) 39 Page - WIZnet Co., Ltd |
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W5200 Datasheet(HTML) 39 Page - WIZnet Co., Ltd |
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39 / 88 page  © Copyright 2013 WIZnet Co.,Ltd. All rights reserved. 39 Figure 7 Physical Address Calculation But this value itself is not the physical address to read. So, the physical address should be calculated as follow. 1. Socket n TX Base Address (hereafter we'll call gSn_TX_BASE) and Socket n TX Mask Address (hereafter we'll call gSn_TX_MASK) are calculated on TMSR value. Refer to the psedo code of the Initialization if detail is needed. 2. The bitwise-AND operation of two values, Sn_TX_WR and gSn_TX_MASK give result to the offset address(hereafter we'll call get_offset) in TX memory range of the socket. 3. Two values get_offset and gSn_TX_BASE are added together to give result tothe physical address(hereafter, we'll call get_start_address). Now, write the transmission data to get_start_address as large as you want. (* There's a case that it exceeds the TX memory upper-bound of the socket while writing. In this case, write the |
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