cn8236 Mindspeed Technologies, cn8236 Datasheet - Page 178

• Manufacturer Part Number: cn8236
• Description: Atm Servicesar Plus With Xbr Traffic Management
• Manufacturer: Mindspeed Technologies

6.0 Traffic Management
6.2 xBR Cell Scheduler Functional Description
6-10
6.2.2.3 Schedule Slot
VBR_OFFSET Described
Formats without
USE_SCH_CTRL
Asserted
The VCC index contents of each Schedule table slot, based on the settings in the
last four rows of the table above, are illustrated in
VBR VCC index(es) to any or all of the VBR VCC_Index fields in a schedule
table slot. Each of the VBR fields in a schedule table slot that is assigned a VBR
VCC_Index has a different scheduling priority (PRI), one from the other. Also,
any of these VBR VCC_Indexes assigned by the SAR can be the first of a linked
list of VBR VCCs.
VBR_OFFSET gives the offset difference in priority level between what the user
or system designer wishes to assign VBR channels and what the SAR assigns via
the VBR Schedule Slot format. Thus, the value of VBR_OFFSET is the
difference between the highest VBR/ABR priority being actively scheduled and
the largest priority of the VBR VCC_Index field in the VBR scheduling slot
(either one or three). For example, if the system designer assigns VBR/ABR
VCCs to three different scheduling priorities with the highest of those priorities
being 5 (that is, PRI = 5), then
VBR_OFFSET = 5 - 3 = 2.
Mindspeed Technologies
ATM ServiceSAR Plus with xBR Traffic Management
™
Figure
6-4. The SAR can assign
28236-DSH-001-B
CN8236