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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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AM79C971VCW датащи(PDF) 186 Page - Advanced Micro Devices |
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AM79C971VCW датащи(HTML) 186 Page - Advanced Micro Devices |
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186 / 265 page  186 Am79C971 P R E L I M INARY RMD3 Bit Name Description 31-0 US User Space. Reserved for user defined space. Transmit Descriptors When SWSTYLE (BCR20, bits 7-0) is set to 0, the soft- ware structures are defined to be 16 bits wide, and transmit descriptors look like Table 49 (CXDA = Current Transmit Descriptor Address). When SWSTYLE (BCR 20, bits 7-0) is set to 2, the soft- ware structures are defined to be 32 bits wide, and transmit descriptors look like Table 50 (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 51 (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. Table 49. 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 50. 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 51. 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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