5802-DS02-R datasheet(28/50 Pages) BOARDCOM

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■ BCM5802

Production Specification

07/03/02

B roa dcom Co rpo rat ion

Page 20 Memory Structures

Document

5802-DS03-405-R

Master Command Record. This structure is used to hand off a number of packets to the chip for processing. The structure

is variable-length, and contains up to 216-1 sets of fields where each field describes one packet. This degree of flexibility

allows the host CPU to queue up any number of packets, and to initiate hardware processing of all queued up packets via

a single PCI write.

Table 5:

Master Command Record

MSB

LSB

30 29

27 26

24 23

21 20

Flags

# Packets in this MCR

Command context address for 1st packet firstPktCMDAddr

Data Buffer Address dataAddr for 1st packet

Next entry in linked list of data buffers for 1st packet next

Reserved

Data buffer length dataLen 1st pkt

Length for 1st packet pktLength

Reserved

Output Buffer Address dataAddr for 1st packet

Next entry in linked list of Output buffers for 1st packet next

Reserved

Output buffer length dataLen 1st pkt

Command context address for 2nd to Nth packet pktCMDAddr

Data Buffer Address dataAddr for 2nd to Nth packet

Next entry in linked list of data buffers for 2nd to Nth packet next

Reserved

Data buffer length dataLen 2-Nth pkt

Length for 2-Nth packet pktLength

Reserved

Output Buffer Address dataAddr for 2-Nth packet

Next entry in linked list of Output buffers for 2-Nth packet next

Reserved

Output buf length dataLen 2-Nth pkt

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