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Datenblatt-Suchmaschine für elektronische Bauteile |
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Datenblatt-Suchmaschine für elektronische Bauteile |
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AM79C975VCW Datenblatt(PDF) 209 Page - Advanced Micro Devices |
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AM79C975VCW Datenblatt(HTML) 209 Page - Advanced Micro Devices |
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209 / 304 page  Am79C973/Am79C975 209 P R E L I M INARY Transmit Descriptors When SWSTYLE (BCR20, bits 7-0) is set to 0, the soft- ware structures are defined to be 16 bits wide, and trans- mit descriptors look like Table 61 (CXDA = Current Transmit Descriptor Address). When SWSTYLE (BCR 20, bits 7-0) is set to 2, the software structures are defined to be 32 bits wide, and transmit descriptors look like Table 62 (CXDA = Current Transmit Descriptor Address). When SWSTYLE (BCR 20, bits 7-0) is set to 3, then the software structures are defined to be 32 bits wide, and transmit descriptors look like Table 63 (CXDA = Current Transmit Descriptor Address). TMD0 Bit Name Description 31-0 TBADR Transmit Buffer address. This field contains the address of the transmit buffer that is associated with this descriptor. TMD1 Bit Name Description 31 OWN This bit indicates whether the de- scriptor entry is owned by the host (OWN = 0) or by the Am79C973/Am79C975 controller (OWN = 1). The host sets the OWN bit after filling the buffer pointed to by the descriptor entry. The Am79C973/Am79C975 con- troller clears the OWN bit after transmitting the contents of the buffer. Both the Am79C973/ Am79C975 controller and the host must not alter a descriptor entry after it has relinquished ownership. 30 ERR ERR is the OR of UFLO, LCOL, LCAR, RTRY or BPE. ERR is set by the Am79C973/Am79C975 controller and cleared by the host. This bit is set in the current descriptor when the error occurs Table 61. Transmit Descriptor (SWSTYLE = 0) Address 15 14 13 12 11 10 9 8 7-0 CXDA+00h TBADR[15:0] CXDA+02h OWN ERR ADD_ FCS MORE/ LTINT ONE DEF STP ENP TBADR[23:16] CXDA+04h 1 1 1 1 BCNT CXDA+06h BUFF UFLO EX DEF LCOL LCAR RTRY TDR Table 62. Transmit Descriptor (SWSTYLE = 2) Address 31 30 29 28 27 26 25 24 23 22-16 15-12 11-4 3-0 CXDA+00h TBADR[31:0] CXDA+04h OWN ERR ADD_ FCS MORE/ LTINT ONE DEF STP ENP BPE RES 1111 BCNT CXDA+08h BUFF UFLO EX DEF LCOL LCAR RTRY RES RES RES RES RES RES TRC CXDA+0Ch USER SPACE Table 63. Transmit Descriptor (SWSTYLE = 3) Address 31 30 29 28 27 26 25 24 23 22-16 15-12 11-4 3-0 CXDA+00h BUFF UFLO EX DEF LCOL LCAR RTRY RES RES TRC CXDA+04h OWN ERR ADD_ FCS MORE/ LTINT ONE DEF STP ENP BPE RES 1111 BCNT CXDA+08h TBADR[31:0] CXDA+0Ch USER SPACE |
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