pxf4336 Infineon Technologies Corporation, pxf4336 Datasheet - Page 118

• Manufacturer Part Number: pxf4336
• Description: Abm Premium Atm Buf Fer Manager
• Manufacturer: Infineon Technologies Corporation

3.6.7
The function of the SCT table (for 2*128 scheduler blocks) is to determine the integer
part (SCTI) and fractional part (SCTF) of the scheduler block output rates as well as the
UTOPIA port number the scheduler is assigned to.
“Scheduler Configuration Table Integer Transfer Registers” on Page 306
“Scheduler Configuration Table Fractional Transfer Registers” on Page 316
provide the details.
3.6.8
The function of the MGT table (for 128 merge groups per direction) is to enable and
specify the cell header overwrite function for the merge group output streams.
“Merge Group Table Transfer Registers” on Page 277
3.6.9
The AVT table is the main context RAM of the ERC and VBR shaping sub-system.
3.6.9.1
The AVT Context RAM addressing scheme imposes some restrictions to the choice of
QID numbers for support of VBR shaping or ABR (ER, VS/VD) operation. The table is
organized into 2 K sections of 4 double words (32-bit) each whereas each section
corresponds to the respective QID number.
Support of VBR shaping requires one section per connection, i.e. up to 2k-1 connections
assigned to QID numbers (1, ..., 2047) can be supported for VBR shaping.
Support of ABR functionality requires two sections per connection, i.e. up to 1K-1
connections can be supported with full ABR functionality.
The following restrictions apply:
Only even QID numbers can be used for ABR operation. Selecting ABR for QID 2n (n =
1..1023) also occupies section 2n+1 of the AVT table. Therefore, VBR operation is
prohibited for QID 2n+1.
QID 0 is reserved for the common real-time queue.
Data Sheet
SCT: Scheduler Configuration Table
MGT: Merge Group Table
AVT: ABR/VBR Configuration Table
AVT Context RAM Organization and Addressing
118
provides the details.
Functional Description
PXF 4336 V1.1
2001-12-17
ABM-P
and