lan9303m Standard Microsystems Corp., lan9303m Datasheet - Page 83

• Manufacturer Part Number: lan9303m
• Description: Small Form Factor Three Port 10/100 Managed Ethernet Switch With Dual Mii/rmii/turbo Mii
• Manufacturer: Standard Microsystems Corp.

Small Form Factor Three Port 10/100 Managed Ethernet Switch with Dual MII/RMII/Turbo MII
Datasheet
SMSC LAN9303M/LAN9303Mi
CIR Setting
1610
4028
8056
160
402
804
0-3
12
19
39
79
4
5
6
7
9
approximately 20 nS per byte increments. Typical values are listed in
receiving at 10Mbps, any setting faster than 39 has the effect of not limiting the rate.
After each packet is received, the bucket is decremented. If the Committed Burst bucket has sufficient
tokens, it is debited and the packet is colored Green. If the Committed Burst bucket lacks sufficient
tokens for the packet, the Excess Burst bucket is checked. If the Excess Burst bucket has sufficient
tokens, it is debited, the packet is colored Yellow and is subjected to random discard. If the Excess
Burst bucket lacks sufficient tokens for the packet, the packet is colored Red and is discarded.
Note: All of the token buckets are initialized to the default value of 1536. If lower values are
Refer to
descriptions.
programmed into the CBS and EBS parameters, the token buckets will need to be normally
depleted below these values before the values have any affect on limiting the maximum value
of the token buckets.
Section 13.4.3.25, on page 313
Time Per Byte
161140 nS
16100 nS
32220 nS
80580 nS
1600 nS
3220 nS
8060 nS
Table 6.3 Typical Ingress Rate Settings
100 nS
120 nS
140 nS
160 nS
200 nS
260 nS
400 nS
800 nS
80 nS
DATASHEET
through
83
Section 13.4.3.29, on page 318
Bandwidth
100 Mbps
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
Table
6.3. When a port is
Revision 1.3 (08-27-09)
for detailed register