pxf4333 Infineon Technologies Corporation, pxf4333 Datasheet - Page 21

• Manufacturer Part Number: pxf4333
• Description: Abm 3g Atm Buf Fer Manager
• Manufacturer: Infineon Technologies Corporation

• Optional queue sharing
• Guaranteed per-queue minimum buffer reservation
• Cell acceptance based on programmable threshold sets with hysteresis evaluation
• Threshold sets for individual queues, traffic classes, schedulers, and global buffer for
• Per VC Packet Discard, including Early Packet Discard (EPD) & Partial Packet
• Cell Loss Priority (CLP) aware selective discard thresholds
• UTOPIA input port backpressure thresholds without head-of-line-blocking
1.1.2
• Multistage scheduling units with
• Additional common real-time bypass queue for each direction, for cascading multiple
• Selectable Peak Cell Rate (PCR) shaping for each queue with minimum 2.62 Kbps
• Selectable Variable Bit Rate (VBR.1.2.3) leaky bucket shaping for up to 2046 queues
• VC merge function for up to 128 merge groups (arbitrary queues per merge group) for
• SB scheduler overbooking possibility
1.1.3
• Two external SDRAM Interfaces for cell storage, one for upstream and one for
• One common cell pointer SSRAM Interface
• Multiport UTOPIA Level 2 Interface in up- and downstream direction conforming to the
• 16-bit Microprocessor Interface, configurable as Intel or Motorola type (with AAL5
Data Sheet
optimized buffer sharing
Discard (PPD) thresholds for Guaranteed Frame Rate (GFR) support
ABM-3Gs
and maximum 343 Mbit/s at 52 MHz clock (65472 programmable rates)
Multi Protocol Label Switching (MPLS) applications
downstream direction (up to 256 K cell buffer per direction)
specifications of the ATM Forum [4]
packet insertion/extraction support)
– Work conservative Weighted Round Robin (WRR) scheduling stage for 128
– Each Scheduler Block comprising of
– 4-cell FIFO buffer at UTOPIA receive interfaces for clock synchronization
– 64-cell buffer logical queueing for up to 48 PHYs at UTOPIA transmit interfaces
Scheduler Blocks
– a Weighted Fair Queueing (WFQ) scheduler with 16320 programmable weight
– a high priority Round Robin (RR) scheduler for real-time traffic
– a low priority RR scheduler for best effort traffic
(head-of-line blocking-free)
(head-of-line blocking-free)
factors for each queue, providing rate guarantees and fairness in bandwidth
allocation
Scheduling Functions
Interfaces
21
PXF 4333 V1.1
2001-12-17
Overview
ABM-3G