KSZ8995FQI Micrel Inc, KSZ8995FQI Datasheet - Page 58

• Manufacturer Part Number: KSZ8995FQI
• Description: 5 Port 10/100 Switch With PHY And Frame Buffers ( )
• Manufacturer: Micrel Inc

Specifications of KSZ8995FQI

• Number Of Primary Switch Ports: 5
• Internal Memory Buffer Size: 64
• Operating Supply Voltage (typ): 1.8/2.5/3.3V
• Fiber Support: Yes
• Integrated Led Drivers: Yes
• Phy/transceiver Interface: MII/SNI
• Data Rate (typ): 10/100Mbps
• Vlan Support: Yes
• Operating Temperature (max): 85C
• Operating Temperature (min): -40C
• Pin Count: 128
• Mounting: Surface Mount
• Jtag Support: No
• Operating Temperature Classification: Industrial
• Data Rate: 100Mbps
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 576-3300

Semptember 2008
Static MAC Address
KS8995MA/FQ has a static and a dynamic address table. When a DA look-up is requested, both tables will be
searched to make a packet forwarding decision. When an SA look-up is requested, only the dynamic table is
searched for aging, migration, and learning purposes. The static DA look-up result will have precedence over the
dynamic DA look-up result. If there are DA matches in both tables, the result from the static table will be used. The
static table can only be accessed and controlled by an external SPI master (usually a processor). The entries in the
static table will not be aged out by KS8995MA/FQ. An external device does all addition, modification and deletion.
Note:
Register bit assignments are different for static MAC table reads and static MAC table write, as shown in the two tables below.
Address
Format of Static MAC Table for Reads (8 entries)
60-57
56
55
54
53
52-48
47-0
Format of Static MAC Table for Writes (8 entries)
59-56
55
54
53
52-48
47-0
Name
FID
Use FID
Reserved
Override
Valid
Forwarding Ports
MAC Address
FID
Use FID
Override
Valid
Forwarding Ports
MAC Address
Description
Filter VLAN ID, representing one of the 16 active
VLANs
1, use (FID+MAC) to look-up in static table.
0, use MAC only to look-up in static table.
Reserved.
1, override spanning tree “transmit enable = 0” or
“receive enable = 0* setting. This bit is used for
spanning tree implementation.
0, no override.
1, this entry is valid, the look-up result will be used.
0, this entry is not valid.
The 5 bits control the forward ports, example:
00001, forward to port 1
00010, forward to port 2
…..
10000, forward to port 5
00110, forward to port 2 and port 3
11111, broadcasting (excluding the ingress port)
48 bit MAC address.
Filter VLAN ID, representing one of the 16 active
VLANs.
1, use (FID+MAC) to look-up in static table.
0, use MAC only to look-up in static table.
1, override spanning tree “transmit enable = 0” or
“receive enable = 0” setting. This bit is used for
spanning tree implementation.
0, no override.
1, this entry is valid, the look-up result will be used.
0, this entry is not valid.
The 5 bits control the forward ports, example:
00001, forward to port 1
00010, forward to port 2
.....
10000, forward to port 5
00110, forward to port 2 and port 3
11111, broadcasting (excluding the ingress port)
48-bit MAC address.
Table 10. Static MAC Address Table
58
Mode
RO
RO
RO
RO
RO
RO
RO
W
W
W
W
W
W
M9999-091508
Default
00000
00000
0000
0000
N/A
0x0
0x0
0
0
0
0
0
0