L-ET4148-50C-DB LSI, L-ET4148-50C-DB Datasheet - Page 102

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

Specifications of L-ET4148-50C-DB

• Lead Free Status / RoHS Status: Supplier Unconfirmed

ET4148-50
Single-Chip 48 x 1 Gbit/s + 2 x 10 Gbits/s Layer 2+ Ethernet Switch
Appendix A: Registers
Layer_2_Aggregation_Mask_Table
Description: Enables the selection of a port from within an aggregate of ports.
Table 105. Layer_2_Aggregation_Mask_Table Register Parameters
Table 106. Layer_2_Aggregation_Mask_Table Field Parameters
Through a series of addition reductions, the receive packet’s MAC destination and MAC source addresses are
reduced to a 3-bit index. Any particular combination of MAC address values always reduces to the same 3-bit
index. This index is used to select one of eight mask values from this table.
When the look-up on a packet’s destination address indicates that its destination port is part of an aggregation of
ports, then all of the ports in that aggregate are enabled by the initial destination map. The mask value retrieved
from this table is used to select one of the ports from within the aggregate.
This set of eight aggregate masks is shared among all of the aggregates configured in the system.
REFERENCE
102
Base Address
Register Size
Register Instances
Register Spacing
Record Size
Record Instances
Record Spacing
aggregation_mask[57:0]
0
4
PORT
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
Field Name
SU7
57
2
Parameter
3
SU6
56
4
5
Figure 76. Layer_2_Aggregation_Mask_Table Register Diagram
6
7
SU1
51
(continued)
8
SU0
50
9
Instances = 1
Mode = R/W
Parameters
Offset = 0.6
Figure 77. Port Numbering Scheme
10
XG1
49
11
Agere Systems - Proprietary
PORT NUMBERING SCHEME
XG0
48
G = 10/100/1000 Mbits/s PORT
XG = 10 Gbits/s PORT
SU = SUPERVISOR
12
0x000c_4480
aggregation_mask[31:0]
13
G47
47
Value
14
NA
64
1
8
8
8
G46
46
The aggregation mask value. Each bit in the
mask corresponds to an Ethernet port or one
of the supervisor’s queues.
15
aggregation_mask[57:32]
G45
16
45
17
G44
44
18
19
Description
20
21
22
G3
3
23
8
24
Preliminary Data Sheet
G2
7
2
25
6
G1
1
26
5
Agere Systems Inc.
G0
27
4
0
28
3
April 2006
29
2
30
1
31
0