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Os motores de busca de Datasheet de Componentes eletrônicos |
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Os motores de busca de Datasheet de Componentes eletrônicos |
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HD6417618 Folha de dados(PDF) 319 Page - Renesas Technology Corp |
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HD6417618 Folha de dados(HTML) 319 Page - Renesas Technology Corp |
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319 / 646 page  Section 12 Ethernet Controller Direct Memory Access Controller (E-DMAC) Rev. 6.00 Jun. 12, 2007 Page 287 of 610 REJ09B0131-0600 (2) Receive Descriptor Figure 12.3 shows the relationship between a receive descriptor and the receive buffer. In frame reception, the E-DMAC performs data rewriting up to a receive buffer 16-byte boundary, regardless of the receive frame length. Finally, the actual receive frame length is reported in the lower 16 bits of RD1 in the descriptor. Data transfer to the receive buffer is performed automatically by the E-DMAC to give a one frame/one buffer or one frame/multi-buffer configuration according to the size of one received frame. Receive descriptor Receive buffer Valid receive data R A C T R D L E R F P 1 R F E RFS26 to RFS0 RD0 RBL RDL RD1 RBA Padding (4 bytes) RD2 R F P 0 31 30 29 28 27 26 0 31 16 31 0 15 0 Figure 12.3 Relationship between Receive Descriptor and Receive Buffer |
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