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DP83821 Datasheet(PDF) 66 Page - National Semiconductor (TI) |
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DP83821 Datasheet(HTML) 66 Page - National Semiconductor (TI) |
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66 / 86 page  66 www.national.com 4.0 Register Set (Continued) 4.2.28 Transmit Descriptor Pointer 1 Register This register points to the Transmit Descriptor for Priority Queue 1. 4.2.29 Transmit Descriptor Pointer 2 Register This register points to the Transmit Descriptor for Priority Queue 2. 4.2.30 Transmit Descriptor Pointer 3 Register This register points to the Transmit Descriptor for Priority Queue 3. Tag: TXDP1 Size: 32 bits Hard Reset: 00000000h Offset: 00A0h Access: Read Write Soft Reset: 00000000h bit tag description usage 31-3 TXDP1 Transmit Descriptor Pointer 1 The current value of the transmit descriptor pointer for Priority Queue 1. When initializing the queue for a new transmission, software must set TXDP to the address of a completed transmit descriptor. While the transmit state machine is active, TXDP will follow the state machine as it advances through a linked list of active descriptors. If the link field of the current transmit descriptor is NULL (signifying the end of the list), TXDP will not advance, but will remain on the current descriptor. Any subsequent writes to the TXE bit of the CR register will cause the transmit state machine to reread the link field of the current descriptor to check for new descriptors that may have been appended to the end of the list. Transmit descriptors must be aligned on an even 64-bit boundary in host memory (A2-A0 must be 0). 2-0 unused Tag: TXDP2 Size: 32 bits Hard Reset: 00000000h Offset: 00A4h Access: Read Write Soft Reset: 00000000h bit tag description usage 31-3 TXDP2 Transmit Descriptor Pointer 2 The current value of the transmit descriptor pointer for Priority Queue 2. When initializing the queue for a new transmission, software must set TXDP to the address of a completed transmit descriptor. While the transmit state machine is active, TXDP will follow the state machine as it advances through a linked list of active descriptors. If the link field of the current transmit descriptor is NULL (signifying the end of the list), TXDP will not advance, but will remain on the current descriptor. Any subsequent writes to the TXE bit of the CR register will cause the transmit state machine to reread the link field of the current descriptor to check for new descriptors that may have been appended to the end of the list. Transmit descriptors must be aligned on an even 64-bit boundary in host memory (A2-A0 must be 0). 2-0 unused Tag: TXDP3 Size: 32 bits Hard Reset: 00000000h Offset: 00A8h Access: Read Write Soft Reset: 00000000h bit tag description usage 31-3 TXDP3 Transmit Descriptor Pointer 3 The current value of the transmit descriptor pointer for Priority Queue 3. When initializing the queue for a new transmission, software must set TXDP to the address of a completed transmit descriptor. While the transmit state machine is active, TXDP will follow the state machine as it advances through a linked list of active descriptors. If the link field of the current transmit descriptor is NULL (signifying the end of the list), TXDP will not advance, but will remain on the current descriptor. Any subsequent writes to the TXE bit of the CR register will cause the transmit state machine to reread the link field of the current descriptor to check for new descriptors that may have been appended to the end of the list. Transmit descriptors must be aligned on an even 64-bit boundary in host memory (A2-A0 must be 0). 2-0 unused |
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