L-ET4148-50C-DB LSI, L-ET4148-50C-DB Datasheet - Page 191

• 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
Policer_Delta_Table_{0..4}
Description: This table is used to specify the per-flow leak rates for the channelized packet processors.
Table 263. Policer_Delta_Table_{0..4} Register Parameters
Table 264. Policer_Delta_Table_{0..4} Field Parameters
The product of the policer_delta[6:0] value in this table and 16 are subtracted from their corresponding
entries in the Policer_Accumulator_Table_{0..4} at a regular interval. The interval is derived from the sys-
tem clock and varies from policer to policer depending on the data rate of the associated Ethernet receive port.
The nominal service interval for a 1 Gbit/s port is once every 12.8 µs or 78,125 times per second. In addition, the
service interval for a 100 Mbits/s port is 1/10 that of a 1 Gbit/s port; and for a 10 Mbits/s port, 1/100 that of a
1 Gbit/s port.
This scaling of service intervals provides the necessary data rate adaptation.
Larger policer_delta[6:0] values translate into higher allowed data rates on the corresponding policer.
When subtracted from the Policer_Accumulator_Table_{0..4}, a product of 16 (policer_delta[6:0]
= 0x1) results in a service interval of 1.25 Mbytes/s or 10 Mbits/s. This is 1% of 1 Gbit/s. A product of 1,600
(policer_delta[6:0] = 0x64) results in a service interval of 125 Mbytes/s or 1 Gbit/s. This is, of course, 100% of the
interface’s rated speed.
For lower-speed interfaces, the interval is reduced proportionately. Therefore, the same values of 1 and 100 can
be used in policer_delta[6:0] for the minimum and maximum intervals.
Base Address
Register Size
Register Instances
Register Spacing
Record Size
Record Instances
Record Spacing
policer_delta[6:0]
0
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9
Parameter
0
Field Name
1
2
3
4
5
Figure 192. Policer_Delta_Table_{0..4} Register Diagram
6
Single-Chip 48 x 1 Gbit/s + 2 x 10 Gbits/s Layer 2+ Ethernet Switch
(continued)
7
8
9
0x0004_d600
Agere Systems - Proprietary
10
Instances = 1
Offset = 0.25
Mode = R/W
Parameters
32768
Value
11
320
80
5
4
4
12
13
14
15
16
The policer delta.
17
18
19
20
21
22
Description
23
8
24
7
25
6
26
5
policer_delta[6:0]
27
4
28
3
29
ET4148-50
2
30
1
31
0
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