IP100A LF
Preliminary Data Sheet
38/97
March. 30, 2007
Copyright © 2004, IC Plus Corp.
IP100A LF-DS-R17
11.2.5 TxDMAFragAddr
Class............................. DMA Data Structures, TFD
Base Address ............... Start of TFD
Address Offset.............. 0x08+n*0x08 for nth fragment (where n=0,1,...63)
Access Mode................ Read/Write
Width ............................ 32 bits
BIT
BIT NAME
BIT DESCRIPTION
31..0
TxDMAFragAddr
Transmit Fragment Address. TxDMAFragAddr contains the physical
address of a contiguous block of data to be transferred from the host
system to the IP100A LF. A fragment can start on any byte boundary.
11.2.6 TxDMAFragLen
Class............................. DMA Data Structures, TFD
Base Address ............... Start of TFD
Address Offset .............. 0x0C+n*0x08 for nth fragment (where n=0,1,...63)
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
Fragment Length. FragLen is the length of the contiguous block of data
pointed to by TxDMAFragAddr. The maximum fragment length is 8192
bytes.
30..13
Reserved
Reserved for future use.
31
TxDMAFragLast
Transmit DMA Last Fragment. TxDMAFragLast is set by the host system
to indicate the last fragment of the transmit frame and that the IP100A LF
should proceed to the next TFD.
11.2.7 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 DMA Next Pointer. TxDMANextPtr contains the physical
address of the next TFD in the transmit DMA list. A value of zero for
TxDMANextPtr accompanies the last frame of the list and it indicates
there are no more TFD’s in the transmit DMA list. All TFD’s must be
aligned on a 8-byte physical address boundary.
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