VT6516 datasheet(27/73 Pages) ETC

27 / 73 page

VIA Technologies, Inc.

Preliminary VT6516 Datarsheet

-27-

Figure 3-2 Free buffer link structure

Table 1-0 Free buffer link structure

bit 18-0

Next entry pointer

bit 35-19

port mask (bit[16]: CPU port + bit[15:0]: Ethernet ports 0~15)

bit 46-36

Packet byte count

bit 50-47

Source port ID

bit 51

Frame type Reserved (zero)

Bit 54-52

Priority

Bit 57-55

Frame tag type Reserved (zero)

bit 58

VLAN tag flag Reserved (zero)

bit 64-59

VLAN ID

bit 95-65

reserved for future

Figure 3-5 The Address table entries structure +

The address table structure as figure 3-5, The address table entries contains the MAC address information

from bit 11 to bit 47, others bits 0~10 or bits 0~14 (2K~32K) as the address entries hashing index, the total

address entries of device assigned by the HASH_BITS(1400H).

Initialization procedures include to set forwarding address table control in normal mode and to invalidate all

forwarding table entries by setting the age-count field as 0. Configure port mask register (USER_PM) for

broadcast MAC address. Configure port mask and MAC address pairs that allow any static MAC to port

mask mapping.

Forwarding table entry has 96 bits, defined as follows:

priority

frame

type

source

port ID

50 47

packet byte

count

port

mask

35 19

pointer to

frame

tag type

16 ports

+1 cpu

reserved

VLAN

tage flag

VLAN ID

static/dynamic

flag

age

count

port

mask

3736

16 ports

+1 cpu

reserved

VLAN

tage flag

VLAN ID

bit-47:11

MAC address

fixed, even for key

length = 11~15

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