Rainbow Electronics W90N745CDG - Manual (Page 102)

W90N745CD/W90N745CDG
Publication Release Date: September 22, 2006
- 97 - Revision A2
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.