XIB-E【PDF 36/64 页】BOARD INTERFACE ETHERNET

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4.1. Addressing

Each RF packet contains addressing information that is used to filter incoming RF data. Receiving

modules inspect the Hopping Channel (HP parameter), Vendor Identification Number (ID

parameter) and Destination Address (DT parameter) contained in each RF packet. Data that does

not pass through all three network security layers is discarded.

Figure?01. Filtration爈ayers燾ontained爄n爐he燫F爌acket爃eader?/DIV>

4.1.1. Address Recognition

Transmissions can be addressed to a specific module or group of modules using the DT

(Destination Address) and MK (Address Mask) parameters. The transmitting module dictates

whether the packet is intended for a specific module (local address) or multiple modules (global

address) by comparing the packets DT parameter to its own MK parameter.

Figure?02. Local燩ackets爒s.燝lobal燩ackets?Transmitting燤odule)?/DIV>

TX_DT?燭ransmitter燚estination燗ddress?/DIV>

TX_MK?燭ransmitter燗ddress燤ask?/DIV>

Note:燱hen燭X_DT??xFFFF?default),燫F爌ackets燼re爂lobal燼nd燼re?/DIV>

received燽y燼ll爉odules爓ithin爎ange.?Receivers燿o爊ot爏end燗CKs.)?/DIV>

A receiving module will only accept a packet if a packet is addressed to it (either as a global or

local packet). The RX module makes this determination by inspecting the destination address of

the RF packet and comparing it to its own address and mask. The Destination Address of the TX

module is logically ANDed with the Address Mask of the RX module.

Figure?03. Address燫ecognition?Receiving燤odule)?/DIV>

TX_DT?燭ransmitter燚estination燗ddress?/DIV>

RX_DT?燫eceiver燚estination燗ddress?/DIV>

RX_MY?燫eceiver燬ource燗ddress?/DIV>

NOTE: For more information regarding addressing and masks, refer to Application Note XST-

AN004b. (Located on the MaxStream CD and on the web: www.maxstream.net)

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