zl50416 Zarlink Semiconductor, zl50416 Datasheet - Page 76

• Manufacturer Part Number: zl50416
• Description: Managed 16-port 10/100 M + 2-port 1 G Ethernet Switch
• Manufacturer: Zarlink Semiconductor

13.9.4
I
Accessed by CPU, serial interface and I
Registers AVPML, AVPMM, and AVPMH allow the eight VLAN Tag priorities to map into eight Internal level transmit
priorities. Under the Internal transmit priority, seven is the 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 packet VLAN priority 0 into Internal transmit priority 7. The new priority is used
inside the ZL50416. When the packet goes out it carries the original priority.
13.9.5
I
Accessed by CPU, serial interface and I
Map VLAN priority into eight level transmit priorities:
2
2
C Address h0AD; CPU Address:h503
C Address h0AE, CPU Address:h504
AVPML – VLAN Tag Priority Map
AVPMM – VLAN Priority Map
Bit [3:0]:
Bit [6:4]:
Bit [7]:
Bit [2:0]:
Bit [5:3]:
Bit [7:6]:
7
7
VP5
VP2
•
Time Base: (Default = 000)
000 = 100us
001 = 200us
010 = 400us
011 = 800us
100 = 1.6ms
101 = 3.2ms
110 = 6.4ms
111 = 100us, same as 000.
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
6
6
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)
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)
5
VP4
2
2
4
VP1
4
C (R/W)
C (R/W)
Zarlink Semiconductor Inc.
3
3
ZL50416
2
VP3
76
1
1
VP0
0
0
VP2
Data Sheet