VT6516 datasheet(47/73 Pages) ETC

47 / 73 page

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.

CPU_SPD_CF

[2:0]

R/W

10-

13H

Congestion Factor of Output Port 0

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.

CONGEST_F

CT0

[25:0]

R/O

14-

17H

Congestion Factor of Output Port 1

CONGEST_F

CT1

[25:0]

R/O

18-

1BH

Congestion Factor of Output Port 2

CONGEST_F

CT2

[25:0]

R/O

1C-

1FH

Congestion Factor of Output Port 3

CONGEST_F

CT3

[25:0]

R/O

20-

23H

Congestion Factor of Output Port 4

CONGEST_F

CT4

[25:0]

R/O

24-

27H

Congestion Factor of Output Port 5

CONGEST_F

CT5

[25:0]

R/O

28-

2BH

Congestion Factor of Output Port 6

CONGEST_F

CT6

[25:0]

R/O

2C-

2FH

Congestion Factor of Output Port 7

CONGEST_F

CT7

[25:0]

R/O

30-

33H

Congestion Factor of Output Port 8

CONGEST_F

CT8

[25:0]

R/O

34-

37H

Congestion Factor of Output Port 9

CONGEST_F

CT9

[25:0]

R/O

38-

3BH

Congestion Factor of Output Port 10

CONGEST_F

CT10

[25:0]

R/O

3C-

3FH

Congestion Factor of Output Port 11

CONGEST_F

CT11

[25:0]

R/O

40-

43H

Congestion Factor of Output Port 12

CONGEST_F

CT12

[25:0]

R/O

44-

47H

Congestion Factor of Output Port 13

CONGEST_F

CT13

[25:0]

R/O

48-

4BH

Congestion Factor of Output Port 14

CONGEST_F

CT14

[25:0]

R/O

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