L-ET4148-50C-DB LSI, L-ET4148-50C-DB Datasheet - Page 159

• 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
Packet_Buffer_Descriptor_Usage_Count
Description: Provides a real-time indication of the number of descriptors allocated to each port group.
Table 204. Packet_Buffer_Descriptor_Usage_Count Register Parameters
Table 205. Packet_Buffer_Descriptor_Usage_Count Field Parameters
This register provides a real-time indication of the number of descriptors that have been allocated to one of four
port groups. Ports are grouped together as follows:
Table 206. Port/Group Associations
Base Address
Register Size
Register Instances
Register Spacing
Record Size
Record Instances
Record Spacing
descriptor_usage_count[13:0]
0
Group
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9
0
0
1
2
3
1
Field Name
Parameter
2
3
Figure 152. Packet_Buffer_Descriptor_Usage_Count Register Diagram
4
5
6
2, 6, 10, 14, 18, 22, 26, 30, 34, 38, 42, 46, 60
3, 7, 11, 15, 19, 23, 27, 31, 35, 39, 43, 47, 60
7
0, 4, 8, 12, 16, 20, 24, 28, 32, 36, 40, 44, 50
1, 5, 9, 13, 17, 21, 25, 29, 33, 37, 41, 45, 50
Single-Chip 48 x 1 Gbit/s + 2 x 10 Gbits/s Layer 2+ Ethernet Switch
(continued)
8
9
10
Agere Systems - Proprietary
Instances = 1
Offset = 0.18
Mode = R/W
Parameters
11
0x000c_bb60
12
Value
13
Ports
NA
NA
16
1
4
4
14
15
16
17
The number of descriptors allocated to the corre-
sponding port group.
18
19
20
21
descriptor_usage_count[13:0]
22
23
8
Description
24
7
25
6
26
5
27
4
28
3
29
2
ET4148-50
30
1
31
0
159