Sundance Spas ST201 - Manual (Page 29)

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Sundance Technology ST201 PRELIMINARY draft 2
TXDMAFRAGLEN
Class....................DMA Data Structures, TFD
Base Address ......Start of TFD
Address Offset .....0x04+n·8 for nth fragment
Access Mode .......Read/Write
Width ...................32 bits
Transmit Fragment Length (TxDMAFragLen) contains fragment length and control information for the
block of data pointed to by the corresponding TxDMAFragAddr.
BIT BIT NAME BIT DESCRIPTION
12..0 FragLen The length of the contiguous block of data pointed to by the TxDMA-
FragAddr. The maximum fragment length is 8192 bytes.
30..13 Reserved Reserved for future use. Should be set to 0.
31 TxDMAFragLast Set by the host system to indicate the last fragment of the transmit
frame and that the ST201 should proceed to the next TFD.