L-ET4148-50C-DB LSI, L-ET4148-50C-DB Datasheet - Page 184

• 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
Packet_Buffer_Shaper_Accumulator_Even
Description: Up/down accumulators used for traffic shaping.
Table 249. Packet_Buffer_Shaper_Accumulator_Even Register Parameters
Table 250. Packet_Buffer_Shaper_Accumulator_Even Field Parameters
The shaper accumulators are used to determine when a particular queue may have one of its packet’s scheduled
for retrieval and transmission. A queue is considered eligible for scheduling when its corresponding
shaper_accumulator[15:4] value is greater than zero.
There is one shaper_accumulator[15:4] value per queue.
The byte count of a transmitted packet is subtracted from its queue’s associated shaper_accumulator[15:4]
value. Shaper credits are periodically added to shaper_accumulator[15:4].
184
Base Address
Register Size
Register Instances
Register Spacing
Record Size
Record Instances
Record Spacing
shaper_accumulator_sign
shaper_accumulator[15:4]
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
REFERENCE
1
Field Name
QUEUE
2
Parameter
3
Figure 179. Packet_Buffer_Shaper_Accumulator_Even Register Diagram
4
SU7
407
5
SU6
406
6
7
(continued)
SU1
401
8
Figure 180. Queue Numbering Scheme
SU0
400
9
399
10
Instances = 1
Instances = 1
Offset = 0.15
Offset = 0.16
Mode = R/W
Mode = R/W
Parameters
11
Agere Systems - Proprietary
XG1
...
QUEUE NUMBERING SCHEME
12
392
G = 10/100/1000 Mbits/s PORT
XG = 10 Gbits/s PORT
SU = SUPERVISOR
13
391
14
XG0
0x000c_a800
...
15
Value
384
16
816
204
NA
1
4
4
383
The sign of the two’s complement
shaper_accumulator[15:4] value. When
asserted, this signal indicates that
shaper_accumulator[15:4] is negative.
The current value of a traffic shaper accumulator.
This counter does not count below its negative min-
imum or above its positive maximum.
17
G47
18
...
shaper_accumulator[15:4]
19
376
20
21
22
Description
15
23
8
24
7
G1
...
Preliminary Data Sheet
25
6
8
26
5
7
27
4
G0
Agere Systems Inc.
...
28
3
0
0
29
2
0
April 2006
30
1
0
31
0
0