CN8236EBGB Mindspeed Technologies, CN8236EBGB Datasheet - Page 225
CN8236EBGB
Manufacturer Part Number
CN8236EBGB
Description
ATM SAR 155Mbps 3.3V ABR/CBR/GFR/UBR/VBR 388-Pin BGA
Manufacturer
Mindspeed Technologies
Datasheet
1.CN8236EBGB.pdf
(443 pages)
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
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Table 6-28. Exponent Table
CN8236
ATM ServiceSAR Plus with xBR Traffic Management
28236-DSH-001-B
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
Table 6-29. Exponent Table Field Descriptions
31
0
EXP_BASE31-EXP_BA
SE0
SHIFT31-SHIFT0
Table 6-27. ABR Rate Decision Vector (ARDV)
Field Name
000
001
010
011
100
101
110
111
Value
Reserved/Unused, or
Transmit Forward RM cell, ADTF not expired, CRM not expired
Transmit Forward RM cell, ADTF not expired, CRM expired
Reserved/Unused, or
Transmit Forward RM cell, ADTF expired, CRM not expired
Reserved/Unused, or
Transmit Forward RM cell, ADTF expired, CRM expired
Received Backward RM cell with CI = 0, NI = 0
Received Backward RM cell with CI = 0, NI = 1
Received Backward RM cell with CI = 1, NI = 0
Received Backward RM cell with CI = 1, NI = 1
Rsvd
Rsvd
Rsvd
Base rate decision block index.
Shift of ER mantissa. Rate index is EXP_BASEn + mantissa>>SHIFTn.
If the ER NZ bit is not set, the rate index is EXP_BASE0.
An exponent table maps an explicit rate to a rate decision block index. The table is
indexed by the ER exponent.
Figure 6-23 illustrates the linkage pattern between the components of the ABR
Instruction Tables.
Mindspeed Technologies
SHIFT31
SHIFT0
Description
Description
6.5 Traffic Management Control and Status Structures
™
EXP_BASE31
EXP_BASE0
6.0 Traffic Management
6-57
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