KS8993M Micrel Inc, KS8993M Datasheet - Page 68

• Manufacturer Part Number: KS8993M
• Description: IC SWITCH 10/100 3PORT 128PQFP
• Manufacturer: Micrel Inc

Specifications of KS8993M

• Applications: *
• Mounting Type: Surface Mount
• Package / Case: 128-MQFP, 128-PQFP
• Number Of Primary Switch Ports: 3
• Internal Memory Buffer Size: 32
• 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 Supply Voltage (max): 1.89/3.465V
• Operating Supply Voltage (min): 1.71/3.135V
• Power Dissipation: 800mW
• Supply Current: 0.1/0.19A
• Operating Temperature Classification: Commercial
• Data Rate: 100Mbps
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: 576-1013 - BOARD EVAL EXPERIMENT KS8993M
• Lead Free Status / RoHS Status: Not Compliant, Lead free / RoHS Compliant

If 802.1Q VLAN mode is enabled, KS8993M will assign a VID to every ingress packet. If the packet is untagged or
tagged with a null VID, the packet is assigned with the default port VID of the ingress port. If the packet is tagged
with non null VID, the VID in the tag will be used. The lookup process will start from the VLAN table lookup. If the
VID is not valid, the packet will be dropped and no address learning will take place. If the VID is valid, the FID is
retrieved. The FID+DA and FID+SA lookups are performed. The FID+DA lookup determines the forwarding ports.
If FID+DA fails, the packet will be broadcast to all the members (excluding the ingress port) of the VLAN. If
FID+SA fails, the FID+SA will be learned.
Dynamic MAC Address Table
This table is read only. The table contents are maintained by KS8993M only.
Micrel, Inc.
April 2005
Bit
71
70-67
Bit
19
18-16
15-12
11-0
Examples:
1. VLAN Table Read (read the 3
2. VLAN Table Write (write the 7
Then
Write to reg. 110 with 0x14 (read VLAN table selected)
Write to reg. 111 with 0x02 (trigger the read operation)
Read reg. 118 (VLAN table bits 19-16)
Read reg. 119 (VLAN table bits 15-8)
Read reg. 120 (VLAN table bits 7-0)
Write to reg. 118 (VLAN table bits 19-16)
Write to reg. 119 (VLAN table bits 15-8)
Write to reg. 120 (VLAN table bits 7-0)
Write to reg. 110 with 0x04 (write VLAN table selected)
Write to reg. 111 with 0x06 (trigger the write operation)
Name
Data not ready
Reserved
Name
Valid
Membership
FID
VID
Table 14. Format of Dynamic MAC Address Table (1K Entries)
Table 13. Format of Static VLAN Table (16 Entries)
R/W
RO
RO
R/W
R/W
R/W
R/W
R/W
Description
= 1, entry is not ready, retry until this bit is set to
0
= 0, entry is ready
Reserved
rd
Description
= 1, the entry is valid
= 0, entry is invalid
Specify which ports are members of the VLAN. If
a DA lookup fails (no match in both static and
dynamic tables), then the packet associated with
this VLAN will be forwarded to ports specified in
this field. For example, 101 means port 3 and 1
are in this VLAN.
Filter ID. KS8993M supports 16 active VLANs
represented by these four bit fields. FID is the
mapped ID. If 802.1Q VLAN is enabled, the
lookup will be based on FID+DA and FID+SA.
IEEE 802.1Q 12 bits VLAN ID
th
entry)
entry)
68
Default
Default
1
111
0x0
0x001
KS8993M/ML/MI
M9999-041205