PIC18F2331-I/SO【PDF 9/119 页】IC PIC MCU FLASH 4KX16 28SOIC

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Micrel, Inc.

KSZ8842-PMQL/PMBL

October 2007

106

M9999-100207-1.5

Static MAC Address Table

The KSZ8842-PMQL/PMBL supports both a static and a dynamic MAC address table. In response to a Destination

Address (DA) look up, The KSZ8842-PMQL/PMBL searches both tables to make a packet forwarding decision. In

response to a Source Address (SA) look up, only the dynamic table is searched for aging, migration and learning

purposes.

The static DA look up result takes precedence over the dynamic DA look up result. If there is a DA match in both

tables, the result from the static table is used. These entries in the static table will not be aged out by the KSZ8842-

PMQL/PMBL.

Bit

Default

R/W

Description

57 – 54

0000

FID

Filter VLAN ID - identifies one of the 16 active VLANs.

R/W

Use FID

1 =specifies the use of FID+MAC for static table look ups

0 = specifies only the use of MAC for static table look ups

R/W

Override

1 = overrides the port setting “transmit enable=0” or “receive enable=0”

setting.

0 = specifies no override

R/W

Valid

1 = specifies that this entry is valid, the look up result will be used

0 = specifies that this entry is not valid

50 – 48

000

R/W

Forwarding ports

These 3 bits control the forwarding port(s):

000 ,no forward

001, forward to port 1

010, forward to port 2

100, forward to port 3

011, forward to port 1 and port 2

110, forward to port 2 and port 3

101, forward to port 1 and port 3

111, broadcasting (excluding the ingress port)

47 – 0

R/W

MAC address

48 bits MAC Address

Table 12. Static MAC Table Format (8 Entries)

Examples:

1. Static Address Table Read (read the second entry at indirect address offset 0x01)

Write to reg. IACR with 0x1001 (set indirect address and trigger a read static MAC table operation)

Then

Read reg. IADR3 (static MAC table bits 57-48)

Read reg. IADR2 (static MAC table bits 47-32)

Read reg. IADR5 (static MAC table bits 31-16)

Read reg. IADR4 (static MAC table bits 15-0)

2. Static Address Table Write (write the eighth entry at indirect address offset 0x07)

Write to reg. IADR3 (static MAC table bits 57-48)

Write to reg. IADR2 (static MAC table bits 47-32)

Write to reg. IADR5 (static MAC table bits 31-16)

Write to reg. IADR4 (static MAC table bits 15-0)

Write to reg. IACR with 0x0007 (set indirect address and trigger a write static MAC table operation)

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