CN8236EBGB Mindspeed Technologies, CN8236EBGB Datasheet - Page 258

• Manufacturer Part Number: CN8236EBGB
• Description: ATM SAR 155Mbps 3.3V ABR/CBR/GFR/UBR/VBR 388-Pin BGA
• Manufacturer: Mindspeed Technologies

Specifications of CN8236EBGB

• Package: 388BGA
• Traffic Class: ABR|CBR|GFR|UBR|VBR
• Utopia Type: Level 1|Level 2
• Host Interface: PCI
• Maximum Data Rate: 155 Mbps
• Typical Operating Supply Voltage: 3.3 V
• Minimum Operating Supply Voltage: 3 V

9.0 Local Memory Interface
9.3 Memory Size Analysis
9-6
Table 9-2. Memory Size in Bytes
SEG Schedule Table
SEG SEG_PM
RS Queue
SEG Transmit Queues
SEG ER Tables
RSM Free Buffer Queues
RSM PM-OAM
RSM VPI Index Table
Total Fixed
SEG VCC Table
SEG Buffer Descriptors
RSM VCC Table
RSM VCI Index Table
Total Incremental
Grand Total
Data Structure
9.3 Memory Size Analysis
Table 9-2
the following assumptions:
SEGMENTATION
1.
2.
3.
4.
5.
6.
7.
REASSEMBLY
1.
2.
3.
4.
5.
6.
7.
20480
16896
1024
8192
1024
67200
4096
512
1024
99200
40960
49152
92
110684
209884
The Schedule table is 2,112 schedule slots and each slot is a double word.
This allows CBR and three-priority VBR schedule in 64 Kbps increments
for an OC-3 connection.
Eight ABR Templates.
32 OAM PM channels active.
Transmit queues configured for 256 entries.
No status queues in SAR local memory.
Each active channel has an average of one active segmentation buffer.
RS_Queue size is 1,024 entries.
Eight VPIs per 1,024 channels.
1,024 entries preallocation on VPI = 0 only.
UNI VPI space.
32 OAM PM channels active.
Free buffer queues configured for 256 entries.
No status queues in SAR local memory.
FBQ pools 0-15 have 4-word entries, and pools 16-31 have 2-word entries.
Mindspeed Technologies
lists the memory size requirements for 1,024 configured VCCs under
One Peer
16896
1024
8192
16384
67200
65536
512
1024
176000
40960
20480
49152
92
110684
286684
ATM ServiceSAR Plus with xBR Traffic Management
16 Peers
™
16896
1024
8192
32768
67200
98304
512
1024
225152
40960
20480
49152
92
110684
335836
28236-DSH-001-B
32 Peers
CN8236