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AM79C975VCW Datasheet(PDF) 143 Page - Advanced Micro Devices |
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AM79C975VCW Datasheet(HTML) 143 Page - Advanced Micro Devices |
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143 / 304 page  Am79C973/Am79C975 143 P R E L I M INARY by H_RESET, S_RESET, or STOP. CSR38: Next Next Transmit Descriptor Address Lower Bit Name Description 31-16 RES Reserved locations. Written as zeros and read as undefined. 15-0 NNXDAL Contains the lower 16 bits of the next next transmit descriptor ad- dress pointer. Read/Write accessible only when either the STOP or the SPND bit is set. These bits are unaffected by H_RESET, S_RESET, or STOP. CSR39: Next Next Transmit Descriptor Address Uper Bit Name Description 31-16 RES Reserved locations. Written as zeros and read as undefined. 15-0 NNXDAU Contains the upper 16 bits of the next next transmit descriptor ad- dress pointer. Read/Write accessible only when either the STOP or the SPND bit is set. These bits are unaffected by H_RESET, S_RESET, or STOP. CSR40: Current Receive Byte Count Bit Name Description 31-16 RES Reserved locations. Written as zeros and read as undefined. 15-12 RES Reserved locations. Read and written as zeros. 11-0 CRBC Current Receive Byte Count. This field is a copy of the BCNT field of RMD1 of the current re- ceive descriptor. Read/Write accessible only when either the STOP or the SPND bit is set. These bits are unaffected by H_RESET, S_RESET, or STOP. CSR41: Current Receive Status Bit Name Description 31-16 RES Reserved locations. Written as zeros and read as undefined. 15-0 CRST Current Receive Status. This field is a copy of bits 31-16 of RMD1 of the current receive de- scriptor. Read/Write accessible only when either the STOP or the SPND bit is set. These bits are unaffected by H_RESET, S_RESET, or STOP. CSR42: Current Transmit Byte Count Bit Name Description 31-16 RES Reserved locations. Written as zeros and read as undefined. 15-12 RES Reserved locations. Read and written as zeros. 11-0 CXBC Current Transmit Byte Count. This field is a copy of the BCNT field of TMD1 of the current trans- mit descriptor. Read/Write accessible only when either the STOP or the SPND bit is set. These bits are unaffected by H_RESET, S_RESET, or STOP. CSR43: Current Transmit Status Bit Name Description 31-16 RES Reserved locations. Written as zeros and read as undefined. 15-0 CXST Current Transmit Status. This field is a copy of bits 31-16 of TMD1 of the current transmit de- scriptor. Read/Write accessible only when either the STOP or the SPND bit is set. These bits are unaffected by H_RESET, S_RESET, or STOP. CSR44: Next Receive Byte Count Bit Name Description |
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