VT6516 datasheet(51/73 Pages) ETC

51 / 73 page

VIA Technologies, Inc.

Preliminary VT6516 Datarsheet

-51-

0AH

CPU port related forwarding configuration

bit 0 – enable forwarding broadcast packets with

DMAC=0xffffffffffff to CPU

(default = 0 : disable)

bit 1 – enable forwarding spanning-tree packets to CPU

(default = 0 : disable)

bit 2 – enable forwarding unicast packets with DMAC =

switch MAC base to CPU

(default = 0 : disable)

The three register bits are used to enable/disable forwarding the

above three types of frames to the CPU port. Note that for a

lookup-miss packet, whether it will be forwarded to the CPU port is

determined by the bit USER_PM[16], rather than this register.

CPU_FWD_C

[2:0]

R/W

0BH

Sniffer Port ID

This register is valid only if MONITOR_PM is not all 0's. The

default value of MONITOR_PM is all 0's to disable the Sniffer

function.

SNIFFER_PID [3:0]

R/W

0C-0EH Monitor Port Mask

This register is used to specify which ports to be monitored by

Sniffer so that all packets forwarded from/to the monitored ports are

also made a copy sent to the Sniffer port. The Sniffer function is

enabled only if MONITOR_PM is not all 0's. The default value of

MONITOR_PM is all 0's to disable the sniffer function.

MONITOR_P

[16:0]

R/W

10H

high byte [14:8] of the MAC hash address to be aged

AGE_MAC is in the hash-key format of bits [14:0]. The high byte

[14:8] is stored in the AGE_MAC register of offset 10H. The low

byte [7:0] is stored in the AGE_MAC register of offset 11H. A write

to the register of offset 11H will trigger an aging operation that

decreases by one the age count of the corresponding forwarding

table entry. A forwarding table entry with age count = 0 is an invalid

entry, i.e. this entry is available for the source MAC learning.

AGE_MAC is reset to all 0's after aging.

AGE_MAC

[6:0]

R/W

11H

low byte [7:0] of the MAC hash address to be aged

(see the above)

AGE_MAC

[7:0]

R/W

12H

Aging Status

0, idle or done (default)

1: aging in progress

After an aging command is issued, the status is recorded in this

changes from 1 (in-progress) to 0 (done).

AGING_STAT

[0]

R/O

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