KS8995MA Micrel Inc, KS8995MA Datasheet - Page 53

• Manufacturer Part Number: KS8995MA
• Description: IC SWITCH 10/100 5PORT 128PQFP
• Manufacturer: Micrel Inc

Specifications of KS8995MA

• Applications: *
• Mounting Type: Surface Mount
• Package / Case: 128-MQFP, 128-PQFP
• 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
• Power Supply Type: Analog/Digital
• Package Type: PQFP
• Data Rate (typ): 10/100Mbps
• Vlan Support: Yes
• Operating Temperature (max): 70C
• Operating Temperature (min): 0C
• Pin Count: 128
• Mounting: Surface Mount
• Jtag Support: No
• Operating Temperature Classification: Commercial
• Data Rate: 100Mbps
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: 576-1017 - BOARD EVAL EXPERIMENT KS8995M
• Lead Free Status / RoHS Status: Not Compliant, Lead free / RoHS Compliant

Static MAC Address
KS8995MA 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. 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.
Format of Static MAC Table for Writes (8 entries)
May 2005
KS8995MA
Address
Format of Static MAC Table for Reads (8 entries)
60-57
56
55
54
53
52-48
47-0
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 12. Static MAC Address Table
53
Mode
RO
RO
RO
RO
RO
RO
RO
W
W
W
W
W
W
Default
0000
0
N/A
0
0
00000
0x0
0000
0
0
0
00000
0x0
M9999-051305
Micrel, Inc.