RS8234 Mindspeed Technologies, RS8234 Datasheet - Page 192

• Manufacturer Part Number: RS8234
• Description: Atm Servicesar Plus With Xbr Traffic Management
• Manufacturer: Mindspeed Technologies

6.0 Traffic Management
6.3 ABR Flow Control Manager
Figure 6-20. Explicit Rate (ER) RATE_INDEX Candidate Selection
6-32
ER
each of which are
RATE_INDEX in the VCC’s SCH_STATE entry. Then the RS8234 uses this
RATE_INDEX to point to the corresponding appropriate RDB and, as specified
in TM 4.1, updates the VCC’s rate parameter with the RDB’s I and L parameters.
coprocessor passes the CI, NI, and ER fields from the RM cell to the ABR Flow
Control Manager via the RSM/SEG Queue. The Flow Control Manager uses the
ABR Rate Decision Table and the Exponent Table, both programmable
components of an ER template, to calculate the two RATE_INDEX candidates,
each of which are
candidate. Then the RS8234 updates the VCC’s rate parameters with the newly
selected rate index. This rate index points to a Rate Decision Block whose I and L
parameters establish the new rate. The Cell Scheduler uses the updated rate to
schedule all future traffic (until the next rate update, of course.)
Once both candidates are identified, the RS8234 selects the smaller of the two,
Figure 6-21 shows a block diagram of this process. The reassembly
Mindspeed Technologies
CANDIDATE
INDEX
ER
MCR. The winning candidate then replaces the current
MCR. The min() function is applied to select a winning
CONNECTION STATE (RATE_INDEX)
ATM ServiceSAR Plus with xBR Traffic Management
™
28234-DSH-001-B
RS8234
100074_059