
VIA Technologies, Inc.
Preliminary VT6516 Datarsheet
-
47-
04H
CPU Port Speed Configuration
3’b000: 1 Mbit (default)
3’b001: 5 Mbit
3’b010: 10 Mbit
3’b011: 20 Mbit
3’b100: 40 Mbit
3’b101: 50 Mbit
3’b110: 80 Mbit
3’b111: 100 Mbit
This register is used to calculate the congestion factor of the CPU
port, that is the quotient of the accumulated byte count of the CPU
output queue to the specified CPU port speed. While the congestion
control is triggered, the output ports with congestion factor larger
than the average will enter into the congestion control mode.
Congestion Factor of Output Port 0
CPU_SPD_CF
G
[2:0]
0
R/W
10-
13H
The congestion factor, i.e. the quotient of the accumulated byte
count of the output queue to the port speed, for each of 16 Ethernet
ports is calculated by the flow control module. While the congestion
control is triggered, the output ports with congestion factor larger
than the average will enter into the congestion control mode.
Congestion Factor of Output Port 1
CONGEST_F
CT0
[25:0]
0
R/O
14-
17H
18-
1BH
1C-
1FH
20-
23H
24-
27H
28-
2BH
2C-
2FH
30-
33H
34-
37H
38-
3BH
3C-
3FH
40-
43H
44-
47H
48-
4BH
CONGEST_F
CT1
[25:0]
0
R/O
Congestion Factor of Output Port 2
CONGEST_F
CT2
[25:0]
0
R/O
Congestion Factor of Output Port 3
CONGEST_F
CT3
[25:0]
0
R/O
Congestion Factor of Output Port 4
CONGEST_F
CT4
[25:0]
0
R/O
Congestion Factor of Output Port 5
CONGEST_F
CT5
[25:0]
0
R/O
Congestion Factor of Output Port 6
CONGEST_F
CT6
[25:0]
0
R/O
Congestion Factor of Output Port 7
CONGEST_F
CT7
[25:0]
0
R/O
Congestion Factor of Output Port 8
CONGEST_F
CT8
[25:0]
0
R/O
Congestion Factor of Output Port 9
CONGEST_F
CT9
[25:0]
0
R/O
Congestion Factor of Output Port 10
CONGEST_F
CT10
[25:0]
0
R/O
Congestion Factor of Output Port 11
CONGEST_F
CT11
[25:0]
0
R/O
Congestion Factor of Output Port 12
CONGEST_F
CT12
[25:0]
0
R/O
Congestion Factor of Output Port 13
CONGEST_F
CT13
[25:0]
0
R/O
Congestion Factor of Output Port 14
CONGEST_F
CT14
[25:0]
0
R/O