Sundance Spas ST201 - Manual (Page 30)

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Sundance Technology ST201 PRELIMINARY draft 2
TXDMANEXTPTR
Class....................DMA Data Structures, TFD
Base Address ......Start of TFD
Address Offset .....0x00
Access Mode .......Read/Write
Width ...................32 bits
BIT BIT NAME BIT DESCRIPTION
31..0 TxDMANextPtr Transmit Next Pointer, the first double word in the TFD contains the
physical address of the next TFD in the TxDMAList. The value of zero
accompanies the last frame of the list and it indicates there are no
more TFD’s in the TxDMAList. All TFD’s must be aligned on 8-byte
physical address boundaries, requiring Bits [2..0] of TxDMANextPtr to
be zero.