CN8236EBGB Mindspeed Technologies, CN8236EBGB Datasheet - Page 159

• 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

Table 5-16. Reassembly Buffer Descriptor Structure
Table 5-17. Reassembly Buffer Descriptor Structure Definitions
CN8236
ATM ServiceSAR Plus with xBR Traffic Management
5.7.3 Reassembly Buffer Descriptor Structure
5.7.4 Free Buffer Queues
28236-DSH-001-B
Table 5-18. Free Buffer Queue Base Table Entry Format
Word 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
NEXT_PTR
BUFF_PTR
Word
0
1
0
1
2
3
Field Name
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
Reserved
Reassembly buffer descriptors reside on word-aligned addresses in host memory.
The host controls the allocation and management of reassembly buffer
descriptors.
to an associated reassembly data buffer, in the BUFF_PTR field.
descriptors.
The host initializes the free buffer queues in SAR-shared memory, and during
reassembly processing, submits data buffers for reassembly to the free buffer
queues.
Table 5-18
entries.
LENGTH
Pointer to the address of the next buffer descriptor.
Pointer to the address of the data cell buffer.
NOTE(S):
descriptor.
During initialization in each buffer descriptor entry, the host writes a pointer
Table 5-16
The free buffer queue base table is located in CN8236 internal memory.
Mindspeed Technologies
The SAR does not access this word; the user can place it anywhere in the buffer
and
UPDATE
and
Table 5-19
Table 5-17
READ_UD_PNTR
NEXT_PTR
BUFF_PTR
Reserved
describe the format of the free buffer queue base table
describe the format of the reassembly buffer
Description/Function
Rsvd
Rsvd
™
5.7 Reassembly Control and Data Structures
5.0 Reassembly Coprocessor
FORWARD
READ
Rsvd
5-49