CN8237EBGB Mindspeed Technologies, CN8237EBGB Datasheet - Page 202

• Manufacturer Part Number: CN8237EBGB
• Description: ATM SAR 622Mbps 3.3V ABR/CBR/GFR/UBR/VBR 456-Pin BGA
• Manufacturer: Mindspeed Technologies

Specifications of CN8237EBGB

• Package: 456BGA
• Traffic Class: ABR|CBR|GFR|UBR|VBR
• Utopia Type: Level 1|Level 2
• Host Interface: PCI
• Maximum Data Rate: 622 Mbps
• Typical Operating Supply Voltage: 3.3 V
• Minimum Operating Supply Voltage: 3.135 V

Table 6-13. VBR1 and VBR2 SCH_STATE Field Descriptions
6.0 Traffic Management
6.5 Traffic Management Control and Status Structures
6.5.3 VBR-Specific Structure
Table 6-12. SCH_STATE for SCH_MODE = VBR1 or VBR2
6-46
6.5.3.1 VBR SCH_STATE
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
BUCKET2
L1_EXP
L1_MAN
I1_EXP
I1_MAN
NOTE(S):
(I is not expressed in cells/sec.)
6.5.3.2 VBR1 or VBR2
7
8
9
Schedule State Table
Field Name
BUCKET2
BUCKET2
The GCRA I value is expressed in cell slot intervals. Example
(MSB)
(LSB)
Index into Bucket table to give I2 and L2 for SCHED_MODE = VBR2 and VBRC. Bucket table base is given
by SEG_BCKB register field. Entries in Bucket table have same format as L1_EXP, L1_MAN, I1_EXP, and
I1_MAN.
GCRA L parameter exponent for bucket 1.
L1_EXP must satisfy L1_EXP min(I1_EXP + 9 or 29).
L1_EXP that does not satisfy L1_EXP I1_EXP – 9 will have an effective L1 value of 0.
GCRA L parameter mantissa for bucket 1.
Bucket 1 L value is 2
GCRA I parameter exponent for bucket 1.
I1_EXP must satisfy 10 I1_EXP
GCRA I parameter mantissa for bucket 1.
Bucket 1 I value is 2
L1_EXP
Table 6-12
entry, which consists of words 7–9 for VBR.
See
Section 6.2.4
Mindspeed Technologies
(I1_EXP - 10)
(L1_EXP – 10)
and
6-13
L1_MAN
(1+I1_MAN / 512).
(1+L1_MAN / 512).
define the SCH_STATE part of the Segmentation VCC table
for key data on I and L values.
25.
ATM OC-12 ServiceSAR Plus with xBR Traffic Management
Reserved
Description
Reserved
I
=
------------ -
PCR
1
™
I1_EXP
R
MAX
28237-DSH-001-C
I1_MAN
CN8237