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AM79C971VCW 数据表(PDF) 183 Page - Advanced Micro Devices |
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AM79C971VCW 数据表(HTML) 183 Page - Advanced Micro Devices |
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183 / 265 page  Am79C971 183 P R E L I M INARY Mode The mode register field of the initialization block is cop- ied into CSR15 and interpreted according to the de- scription of CSR15. Receive Descriptors When SWSTYLE (BCR20, bits 7-0) is set to 0, then the software structures are defined to be 16 bits wide, and receive descriptors look like Table 46 (CRDA = Current Receive Descriptor Address). When SWSTYLE (BCR 20, bits 7-0) is set to 2, then the software structures are defined to be 32 bits wide, and receive descriptors look like Table 47 (CRDA = Current Receive 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 receive descriptors look like Table 48 (CRDA = Current Receive Descriptor Address). RMD0 Bit Name Description 31-0 RBADR Receive Buffer address. This field contains the address of the re- ceive buffer that is associated with this descriptor. RMD1 Bit Name Description 31 OWN This bit indicates whether the de- scriptor entry is owned by the host (OWN = 0) or by the Am79C971 controller (OWN = 1). The Am79C971 controller clears the OWN bit after filling the buffer that the descriptor points to. The host sets the OWN bit after emp- tying the buffer . Table 48. Receive Descriptor (SWSTYLE = 3) Table 46. Receive Descriptor (SWSTYLE = 0) Address 15 14 13 12 11 10 9 8 7-0 CRDA+00h RBADR[15:0] CRDA+02h OWN ERR FRAM OFLO CRC BUFF STP ENP RBADR[23:16] CRDA+04h 1 1 1 1 BCNT CRDA+06h 0 0 0 0 MCNT Table 47. Receive Descriptor (SWSTYLE = 2 Address 31 30 29 28 27 26 25 24 23 22 21 20 19-16 15-12 11-0 CRDA+00h RBADR[31:0] CRDA+04h OWN ERR FRA M OFL O CRC BUF F STP ENP BPE PAM LAFM BAM RES 1111 BCNT CRDA+08h RES RFRTAG[14:0] 0000 MCNT CRDA+0Ch USER SPACE Address 31 30 29 28 27 26 25 24 23 22 21 20 19-16 15-12 11-0 CRDA+00h RES RFRTAG[14:0] 0000 MCNT CRDA+04h OWN ERR FRA M OFL O CRC BUF F STP ENP BPE PAM LAFM BAM RES 1111 BCNT CRDA+08h RBADR[31:0] CRDA+0Ch USER SPACE |
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