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AM79C978AVCW Datasheet(PDF) 133 Page - Advanced Micro Devices |
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AM79C978AVCW Datasheet(HTML) 133 Page - Advanced Micro Devices |
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133 / 256 page  Am79C978A 133 CSR60: Previous THd3nsmit Descriptor Address Lower Bit Name Description 31-16 RES Reserved locations. Written as zeros and read as undefined. 15-0 PXDAL Contains the lower 16 bits of the previous transmit descriptor ad- dress pointer. The Am79C978A controller has the capability to stack multiple transmit frames. These bits are read/write acces- sible only when either the STOP or the SPND bit is set. These bits are unaffected by H_RESET, S_RESET, or STOP. CSR61: Previous Transmit Descriptor Address Upper Bit Name Description 31-16 RES Reserved locations. Written as zeros and read as undefined. 15-0 PXDAU Contains the upper 16 bits of the previous transmit descriptor ad- dress pointer. The Am79C978A controller has the capability to stack multiple transmit frames. These bits are read/write acces- sible only when either the STOP or the SPND bit is set. These bits are unaffected by H_RESET, S_RESET, or STOP. CSR62: Previous Transmit Byte Count Bit Name Description 31-16 RES Reserved locations. Written as zeros and read as undefined. 15-12 RES Reserved locations. 11-0 PXBC Previous Transmit Byte Count. This field is a copy of the BCNT field of TMD1 of the previous transmit descriptor. These bits are read/write acces- sible only when either the STOP or the SPND bit is set. These bits are unaffected by H_RESET, S_RESET, or STOP. CSR63: Previous Transmit Status Bit NameDescription 31-16 RES Reserved locations. Written as zeros and read as undefined. 15-0 PXST Previous Transmit Status. This field is a copy of bits 31-16 of TMD1 of the previous transmit descriptor. These bits are read/write acces- sible only when either the STOP or the SPND bit is set. These bits are unaffected by H_RESET, S_RESET, or STOP. Table 32. Software Styles SWSTYLE [7:0] Style Name SSIZE32 Initialization Block Entries Descriptor Ring Entries 00h LANCE/PCnet-ISA controller 0 16-bit software structures, non-burst or burst access 16-bit software structures, non-burst access only 01h RES 1 RES RES 02h PCnet-PCI controller 1 32-bit software structures, non-burst or burst access 32-bit software structures, non-burst access only 03h PCnet-PCI controller 1 32-bit software structures, non-burst or burst access 32-bit software structures, non-burst or burst access All Other RES Undefined Undefined Undefined |
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