IP100ALF Ver la hoja de datos (PDF) - Unspecified

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IP100ALF

Integrated 10/100 Ethernet MAC + PHY

Unspecified 

IP100A LF

Preliminary Data Sheet

linked list of frame descriptors called TFDs. The host system creates a list of TFDs in system memory,

where each TFD contains the memory locations of one or more fragments of a frame as shown in Figure

4.

HOST SYSTEM MEMORY

TxDMANextPtr

TxFrameControl

1st TxDMAFragAddr

1st TxDMAFragLen

TFD 2nd TxDMAFragAddr

2nd TxDMAFragLen

Last TxDMAFragAddr

Last TxDMAFragLen

1st Data Frag (Buffer)

2nd Data Frag (Buffer)

Last Data Frag (Buffer)

FIGURE 4: TxDMA Data Structure

The TFD format is covered in the Registers and Data Structures section.

The resulting linked list of TFDs is referred to as the TxDMAList, as shown in Figure 5.

HOST SYSTEM MEMORY

TFD1

TFD2

FIGURE 5: TxDMA List of Two TFDs

Copyright © 2004, IC Plus Corp.

18/97

March. 30, 2007

IP100A LF-DS-R17

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