Rainbow-electronics W90P710CDG Manual do Utilizador descarregar pdf (Página 102)

100

101

W90P710CD/W90P710CDG

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Rx Descriptor Word 2

31 30 29 28 27 26 25 24

Reserved

23 22 21 20 19 18 17 16

Reserved

15 14 13 12 11 10 9 8

Reserved

7 6 5 4 3 2 1 0

Reserved

The Rx descriptor word 2 keeps obsolete information for MAC translation. Therefore, these

information bits are undefined and should be ignored.

Rx Descriptor Word 3

31 30 29 28 27 26 25 24

NRXDSA

23 22 21 20 19 18 17 16

NRXDSA

15 14 13 12 11 10 9 8

NRXDSA

7 6 5 4 3 2 1 0

NRXDSA

NRXDSA [31:0]: Next Rx Descriptor Starting Address

The Rx descriptor is a link-list data structure. Consequently, NRXDSA is used to keep the starting

address of the next Rx descriptor. The bits [1:0] will be ignored by EMC. So, all Rx descriptor must

locate at word boundary memory address.

1 2 ... 97 98 99 100 101 102 103 104 105 106 107 ... 551 552

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