IP178C/IP178C LF/IP178CH/IP178CH LF
Datasheet
78/93
June 21, 2007
Copyright © 2004, IC Plus Corp.
IP178Cx-DS-R12
PHY
MII
ROM
R/W
Description
Default
Switch control register 3
9[15:14] 83[7:6]
BF_STM_THR_SEL[1:0].
Broadcast storm threshold selection
00: 159 packets/10ms for 100Mbps port, or 159
packets/100ms for 10Mbps port,
01: 127 packets/10ms for 100Mbps port, or 127
packets/100ms for 10Mbps port,
10: 63 packets/10ms for 100Mbps port, or 63 packets/100ms
for 10Mbps port,
11: 31 packets/10ms for 100Mbps port, or 31 packets/100ms
for 10Mbps port
2’b11
9[13:12]
83[5:4]
SHARE_FULL_THR_SEL[1;0].
Share buffer threshold selection
00: 160 units
01: 180 units
10: 140 units
11: 120 units
2’b00
9[11:10]
83[3:2]
UNIT_DEFAULT_THR_SEL[1:0].
Output Queue minimum threshold selection
00: 40 units
01: 32 units
10: 48 units
11: 56 units
2’b00
9[9:8]
83[1:0]
UNIT_LOW_THR_SEL
2’b00
9[7:6]
82[7:6]
UNIT_HIGH_THR_SEL[1;0].
Output Queue Flow control ON threshold selection
If share buffer is over share buffer full threshold, Output Queue
Flow control ON threshold will be dynamic changed to 28.
Others,
00: 50 units
01: 70 units
10: 90 units
11: 110 units
2’b00
9[5]
82[5]
RESERVED
9[4]
82[4]
PREDROP_EN
1: Drop an incoming broadcast packet if any port is
congested.
0: forward an incoming broadcast packet to un-congested
ports instead of congested ports.
1
31
9[3:2]
82[3:2]
PKT_LOW_THR_SEL[1:0].
Packet low water mark threshold selection
00: 40 units
01: 30 units
10: 20 units
11: 10 units
2’b00
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