L-ET4148-50C-DB LSI, L-ET4148-50C-DB Datasheet - Page 147

• Manufacturer Part Number: L-ET4148-50C-DB
• Manufacturer: LSI

Specifications of L-ET4148-50C-DB

• Lead Free Status / RoHS Status: Supplier Unconfirmed

Preliminary Data Sheet
April 2006
Agere Systems Inc.
Appendix A: Registers
Multicast_Rate_Accumulator
Description: Counts multicast and broadcast packets.
Table 180. Multicast_Rate_Accumulator Register Parameters
Table 181. Multicast_Rate_Accumulator Field Parameters
This leaky bucket counter is incremented by the reception of multicast and broadcast packets and is decremented
by one on a fixed interval. That interval is defined by the contents of the Multicast_Rate_Decrement_Period
register. Whenever the value of multicast_rate_accumulator[15:0] exceeds
Multicast_Rate_Limit, the mask in Multicast_Rate_Discard_Mask is applied to the receive packet’s
destination map.
Multicast_Rate_Accumulator is never decremented through zero nor allowed to exceed
Multicast_Rate_Limit by more than one.
Base Address
Register Size
Register Instances
Register Spacing
Record Size
Record Instances
Record Spacing
multicast_rate_accumulator[15:0]
0
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9
0
1
Parameter
2
Field Name
3
4
5
Figure 135. Multicast_Rate_Accumulator Register Diagram
6
7
Single-Chip 48 x 1 Gbit/s + 2 x 10 Gbits/s Layer 2+ Ethernet Switch
(continued)
8
9
10
Agere Systems - Proprietary
0x000c_4814
11
Instances = 1
Offset = 0.16
Mode = R/W
Parameters
Value
12
NA
NA
4
1
4
1
13
14
15
16
17
The multicast accumulator. Each multicast or
broadcast packet received causes this counter in
increment by one. This counter is decrement peri-
odically by one with a period established by
Multicast_Rate_Decrement_Period.
18
19
multicast_rate_accumultor[15:0]
20
21
22
23
8
Description
24
7
25
6
26
5
27
4
28
3
ET4148-50
29
2
30
1
31
0
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