Sundance Spas ST201 - Manual (Page 36)

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Sundance Technology ST201 PRELIMINARY draft 2
RXDMAFRAGLEN
Class....................DMA Data Structures, RFD
Base Address ......Start of RFD
Address Offset .....0x04+n·8 for nth fragment
Access Mode .......Read/Write
Width ...................32 bits
The fourth and all subsequent even dwords in the RFD contains fragment length and control information
for the block of data pointed to by the previous RxDMAFragAddr.
BIT BIT NAME BIT DESCRIPTION
12..0 FragLen The length of the contiguous block of data pointed to by the previous
RxDMAFragAddr.
30..13 Reserved Reserved for future use. Should be set to 0.
31 RxDMALastFrag Set by the host system to indicate the last fragment of the receive
frame.