EVB9303 SMSC, EVB9303 Datasheet - Page 84

• Manufacturer Part Number: EVB9303
• Description: EVALUATION BOARD FOR LAN9303
• Manufacturer: SMSC

Specifications of EVB9303

• Main Purpose: Interface, Ethernet
• Embedded: No
• Utilized Ic / Part: LAN9303
• Primary Attributes: 3 Ports, 100BASE-TX/10BASE-T, Managed
• Secondary Attributes: Full Duplex and HP Auto-MDIX Support, 10BASE-T and 100BASE-TX
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 638-1095

Revision 1.4 (07-07-10)
6.5.6
EGRESS RATE
SETTING
1589
3973
7947
158
396
794
0-3
12
19
39
78
4
5
6
7
9
Note 6.3
Adding, Removing, and Changing VLAN Tags
Based on the port configuration and the received packet formation, a VLAN tag can be added to,
removed from, or modified in a packet. There are four received packet type cases: non-tagged, priority-
tagged, normal-tagged, and CPU special-tagged. There are also four possible settings for an egress
port: dumb, access, hybrid, and CPU. In addition, each VLAN table entry can specify the removal of
the VLAN tag (the entry’s un-tag bit).
The tagging/un-tagging rules are specified as follows:
Dumb Port - This port type generally does not change the tag.
When a received packet is non-tagged, priority-tagged, or normal-tagged, the packet passes
untouched.
When a packet is received special-tagged from a CPU port, the special tag is removed.
Access Port - This port type generally does not support tagging.
When a received packet in non-tagged, the packet passes untouched.
When a received packet is priority-tagged or normal-tagged, the tag is removed.
When a received packet is special-tagged from a CPU port, the special tag is removed.
CPU Port - Packets transmitted from this port type generally contain a special tag. Special tags
are described in detail in
Hybrid Port - Generally, this port type supports a mix of normal-tagged and non-tagged packets.
It is the most complex, but most flexible port type.
TIME PER BYTE
These are the unlimited max bandwidths when IFG and preamble are taken into account.
158960 nS
15900 nS
31800 nS
79480 nS
1580 nS
3180 nS
7940 nS
100 nS
120 nS
140 nS
160 nS
200 nS
260 nS
400 nS
800 nS
80 nS
Table 6.5 Typical Egress Rate Settings
Small Form Factor Three Port 10/100 Managed Ethernet Switch with Single MII/RMII/Turbo MII
Section 6.4.10, "Host CPU Port Special Tagging," on page
76 Mbps
64 BYTE PACKET
BANDWIDTH @
DATASHEET
870 Kbps
440 Kbps
220 Kbps
8.6 Mbps
4.4 Mbps
2.2 Mbps
66 Mbps
55 Mbps
48 Mbps
42 Mbps
34 Mbps
26 Mbps
17 Mbps
87 Kbps
44 Kbps
(Note
84
6.3)
512 BYTE PACKET
96 Mbps
BANDWIDTH @
990 Kbps
490 Kbps
250 Kbps
2.5 Mbps
78 Mbps
65 Mbps
56 Mbps
49 Mbps
39 Mbps
30 Mbps
20 Mbps
10 Mbps
98 Kbps
49 Kbps
5 Mbps
(Note
6.3)
SMSC LAN9303/LAN9303i
1518 BYTE PACKET
99 Mbps
BANDWIDTH @
500 Kbps
250 Kbps
100 Kbps
2.5 Mbps
80 Mbps
67 Mbps
57 Mbps
50 Mbps
40 Mbps
31 Mbps
20 Mbps
10 Mbps
50 Kbps
5 Mbps
1 Mbps
80.
(Note
Datasheet
6.3)