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VSC7511 Datasheet(PDF) 117 Page - Microsemi Corporation

Part # VSC7511
Description  4-Port Layer-2 Gigabit Ethernet Switch
PDF  324 Pages
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Manufacturer  MICROSEMI [Microsemi Corporation]
Direct Link  http://www.microsemi.com
Logo MICROSEMI - Microsemi Corporation

VSC7511 Datasheet(HTML) 117 Page - Microsemi Corporation

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Functional Descriptions
VMDS-10488 VSC7511 Datasheet Revision 4.2
102
The analyzer contains a MAC table with 4096 entries containing information about stations learned by
the device. The table is organized as a hash table with four buckets and 1024 rows. Each row is indexed
by an 10-bit hash value, which is calculated based on the station’s (MAC, VID) pair, as shown in the
following illustration.
Figure 33 •
MAC Table Organization
The following table lists the fields for each entry in the MAC table.
MACTINDX
Direct address into the MAC table for direct read and write.
None
MACACCESS
Flags and command when accessing the MAC table.
None
MACTOPTIONS
Flags when accessing the MAC table.
None
AUTOAGE
Age scan period.
None
AGENCTRL
Controls the default values for new entries in MAC table.
None
ENTRYLIM
Controls limits on number of learned entries per port.
Per port
LEARNDISC
Counts the number of MAC table entries not learned due lack
of storage in the MAC table.
None
Table 74 •
MAC Table Entry
Field
Bits
Description
VALID
1
Entry is valid.
MAC
48
The MAC address of the station (primary key).
VID
13
VLAN identifier that the station is learned with (primary key).
DEST_IDX
6
Destination mask index pointing to a destination mask in the destination
mask table (PGID entries 0 through 63).
Table 73 •
MAC Table Access (continued)
Register
Description
Replication
bucket 0
bucket 1
bucket 2
bucket 3
Index 0
MAC/VID
Hash Key Value
Index 1
Index XXX
Index 1023
bucket 0
bucket 1
bucket 2
bucket 3
bucket 0
bucket 1
bucket 2
bucket 3
bucket 0
bucket 1
bucket 2
bucket 3



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