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AM79C978VC/W 数据表(PDF) 200 Page - Advanced Micro Devices |
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AM79C978VC/W 数据表(HTML) 200 Page - Advanced Micro Devices |
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200 / 261 page ![]() 200 Am79C978 Figure 51. Address Match Logic 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 82 (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 83 (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 84 (CRDA = Current Receive Descriptor Address). Table 82. Receive Descriptor (SWSTYLE = 0) 1 CRC GEN SEL 31 26 MUX 63 0 64 Match = 1 Packet Accepted Match = 0 Packet Rejected Match Logical Address Filter (LADRF) 0 6 32-Bit Resultant CRC 1 0 Received Message Destination Address 47 22206B-54 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 1111 BCNT CRDA+06h 0000 MCNT Table 83. 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 Table 84. Receive Descriptor (SWSTYLE = 3) Address 31 30 29 28 27 26 25 24 23 22-16 15-12 11-0 CRDA+00h RES RES RES 0000 MCNT CRDA+04h OWN ERR FRAM OFLO CRC BUFF STP ENP BPE RES 1111 BCNT CRDA+08h RBADR[31:0] CRDA+0Ch USER SPACE |
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