Sundance-spas ST201 Manual do Utilizador descarregar pdf (Página 36)

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.

1 2 ... 31 32 33 34 35 36 37 38 39 40 41 ... 144 145

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Sundance-spas ST201 Manual do Utilizador Página 36