AR8327-AL1A-R datasheet(181/394 Pages) ETC2

181 / 394 page

Atheros Communications, Inc.

AR8327/AR8327N Seven-port Gigabit Ethernet

Switch

•

181

Table 3-153, “QM Control Register,” on page 181 summarizes the QM_CTRL_REG Register

Table 3-153.

QM Control Register

Bit

R/W

Inital

Value

Mnemonic

Description

31:30

R/O

RESERVED

29:28

R/O

RESERVED

27:26

R/O

RESERVED

25:24

R/O

RESERVED

23:11

R/O

RESERVED

R/W

QM_FUNC_TEST

1'b1: function test, qm should drop all

packets from port1,2,3,4,5

R/W

MS_FC_EN

Multicast server flow control enable

R/O

RESERVED

R/W

RATE_DROP_EN

drop packet enable due to rate limit.

1'b1: switch will drop frames due to

rate limit.

1'b0: switch would use flow control to

the source port due to rate limit, if the

port won't stop switch will drop frame

from that port.

R/W

FLOW_DROP_EN

1'b1: packet could be drop due to flow

control except the highest priority

packet.

1'b0: switch won't drop packets due to

flow control

5:0

R/W

'hE

FLOW_DROP_CNT

Max free queue could be use after the

port has been flow control. Then

packets should be drop except the

highest priori.

Default value 'hE is set to normal

packets which length is no more than

1518 bytes. For jumbo frame, 'd33 is

commanded.

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