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Motor de Búsqueda de Datasheet de Componentes Electrónicos |
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Motor de Búsqueda de Datasheet de Componentes Electrónicos |
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AM79C978VC/W Datasheet(PDF) 203 Page - Advanced Micro Devices |
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AM79C978VC/W Datasheet(HTML) 203 Page - Advanced Micro Devices |
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203 / 261 page  Am79C978 203 RFRTAG will be read as all zeros. See the section on Receive Frame Tagging for details. 15-12 ZEROS This field is reserved. The Am79C978 controller will write zeros to these locations. 11-0 MCNT Message Byte Count is the length in bytes of the received message, expressed as an unsigned binary integer. MCNT is valid only when ERR is clear and ENP is set. MCNT is written by the Am79C978 controller and cleared by the host. 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 85 (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 86 (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 87 (CXDA = Current Transmit Descriptor Address). Table 85. 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 86. 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 87. 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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