zl50417 ETC-unknow, zl50417 Datasheet - Page 57

• Manufacturer Part Number: zl50417
• Description: Unmanaged 16-port 10/100m +2-port Ethernet Switch
• Manufacturer: ETC-unknow

Data Sheet
13.7.4
I²C Address h0AD; CPU Address:h503
Accessed by serial interface and I²C (R/W)
Registers AVPML, AVPMM, and AVPMH allow the eight VLAN Tag priorities to map into eight Internal level transmit
priorities. Under the Internal transmit priority, Registers AVPML, AVPMM, and AVPMH allow the eight VLAN
priorities to map into eight internal level transmit priorities. Under the internal transmit priority, seven is highest
priority where as zero is the lowest. This feature allows the user the flexibility of redefining the VLAN priority field.
For example, programming a value of 7 into bit 2:0 of the AVPML register would map VLAN priority 0 into internal
transmit priority 7. The new priority is used inside the ZL50417. When the packet goes out it carries the original
priority.
AVPML – VLAN Priority Map
Bit [2:0]:
Bit [5:3]:
Bit [7:6]:
Bit [3:0]:
Bit [6:4]:
Bit [7]:
•
Time Base: (Default = 000)
Select VLAN tag or TOS (IP packets) to be preferentially picked to map
transmit priority and drop priority (Default = 0).
Priority when the VLAN tag priority field is 0 (Default 0)
Priority when the VLAN tag priority field is 1 (Default 0)
Priority when the VLAN tag priority field is 2 (Default 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)
-
-
-
-
-
-
-
-
-
-
7
000 = 100us
001 = 200us
010 = 400us
011 = 800us
100 = 1.6ms
101 = 3.2ms
110 = 6.4ms
111 = 100us, same as 000.
0 – Select VLAN Tag priority field over TOS
1 – Select TOS over VLAN tag priority field
VP2
6
5
Zarlink Semiconductor Inc.
VP1
3
2
VP0
0
ZL50417
57