参数资料
型号: ZL50418GKG2
厂商: CONEXANT SYSTEMS
元件分类: 网络接口
英文描述: DATACOM, LAN SWITCHING CIRCUIT, PBGA553
封装: 37.50 X 37.50 MM, 2.33 MM HEIGHT, LEAD FREE, MS-034, HSBGA-553
文件页数: 10/155页
文件大小: 1928K
代理商: ZL50418GKG2
ZL50418
Data Sheet
107
Zarlink Semiconductor Inc.
12.3.6.3
FCR – Flooding Control Register
I2C Address h0AC; CPU Address:h502
Accessed by CPU, serial interface and I2C (R/W)
Bit [4]:
Per VLAN Multicast Flow Control (Default 0)
0 – Disable
1 – Enable
Bit [5]:
Select processor multicast queue size
0 = 16 entries
1 = 64 entries
Bit [6]:
Select TOS bits for Priority (Default 0)
0 – Use TOS [4:2] bits to map the transmit priority
1 – Use TOS [7:5] bits to map the transmit priority
Bit [7]:
Select TOS bits for Drop priority(Default 0)
0 – Use TOS [4:2] bits to map the drop priority
1 – Use TOS [7:5] bits to map the drop priority
76
4
3
0
Tos
TimeBase
U2MR
Bit [3:0]:
U2MR: Unicast to Multicast Rate. Units in terms of time base defined in
bits [6:4]. This is used to limit the amount of flooding traffic. The value
in U2MR specifies how many packets are allowed to flood within the
time specified by bit [6:4]. To disable this function, program U2MR to
0. (Default = 8)
Bit [6:4]:
Time Base: (Default = 000)
000 = 100 us
001 = 200 us
010 = 400 us
011 = 800 us
100 = 1.6 ms
101 = 3.2 ms
110 = 6.4 ms
111 = 100 us, same as 000.
Bit [7]:
Select VLAN tag or TOS (IP packets) to be preferentially picked to map
transmit priority and drop priority (Default = 0).
0 – Select VLAN Tag priority field over TOS
1 – Select TOS over VLAN tag priority field
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